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InnoSwitch3-Pro Family
Digitally Controllable Off-Line CV/CC QR Flyback Switcher IC
with Integrated High-Voltage MOSFET, Synchronous Rectification
and FluxLink Feedback
Product Highlights
Digitally Controlled via I2C Interface
• Dynamic adjustment of power supply voltage and current
• Telemetry for power supply status and fault monitoring
Comprehensive set of configurable protection features
Highly Integrated, Compact Footprint
Multi-mode Quasi-Resonant (QR) / DCM / CCM flyback controller,
650 V or 725 V MOSFET, secondary-side sensing and synchronous
rectifier driver
Optimized efficiency across line and load range
Integrated FluxLink™, HIPOT-isolated, feedback link
• Instantaneous transient response
• Drives low-cost N-channel MOSFET series load switch
• Integrated 3.6 V supply for external MCU
EcoSmart™ – Energy Efficient
• Less than 30 mW no-load including line sense and MCU
Enables power supply designs that easily comply with all global
energy efficiency regulations
• Low heat dissipation
Advanced Protection / Safety Features
Input voltage monitoring with accurate brown-in/brown-out and
overvoltage protection
Output OV/UV fault detection with independently configured
responses
• Secondary FET / diode short protection
• Open SR FET gate detection
Hysteretic thermal shutdown
Programmable watchdog timer for system faults
Full Safety and Regulatory Compliance
• Reinforced insulation
• Isolation voltage >4000 VAC
100% production HIPOT compliance testing
• UL1577 and TUV (EN60950) safety approved
Green Package
Halogen free and RoHS compliant
Applications
High efficiency USB PD 3.0 + PPS/QC adapters
Multiprotocol adapters including QuickCharge, AFC, FCP, SCP
Direct-charge mobile device chargers
Multi-chemistry tool and general purpose battery chargers
Adjustable CV and CC LED ballast
Description
The InnoSwitch™3-Pro series family of ICs dramatically simplifies the
development and manufacturing of fully programmable, highly efficient
power supplies, particularly those in compact enclosures. The universal
I2C interface enables dynamic control of output voltage and current
along with many configurable features. Telemetry provides reporting
of programmed features and fault modes.
D
InnoSwitch3-Pro
Primary FET
and Controller
S
V
CONTROL
BPP
Figure 1. Typical Application.
Secondary
Control IC
VBUS
RTN
uVCC
SDA
SCL
I2C
MCU
CC1
CC2
PI-8379-101017
Figure 2. High Creepage, Safety-Compliant InSOP-24D Package.
Output Power Table1
Product 4,5
230 VAC ± 15%
Adapter2
Open
Frame3
85-265 VAC
Adapter2
Open
Frame3
INN3365C/3375C 25 W
30 W
22 W
25 W
INN3366C/3376C 35 W
40 W
27 W
36 W
INN3377C
40 W
45 W
36 W
40 W
INN3367C
45 W
50 W
40 W
45 W
INN3368C
55 W
65 W
50 W
55 W
Table 1. Output Power Table.
Notes:
1. Maximum output power is dependent on the design, with maximum IC
package temperature kept <125 °C.
2. Minimum continuous power in a typical non-ventilated enclosed typical size
adapter measured at 40 °C ambient.
3. Minimum peak power capability.
4. C Package: InSOP-24D.
5. INNxx6xC − 650 V MOSFET, INNxx7xC − 725 V MOSFET.
InnoSwitch3-Pro devices are ideal for AC/DC power supply applications
where fine (10 mV, 50 mA) output voltage and current adjustment are
necessary. Typical implementations comprise a system microprocessor
or dedicated microcontroller with an I2C port that is used to configure,
control and supervise operation of the power sub-system. The uVCC pin
provides a bias supply for the microprocessor in stand-alone implemen-
tations such as USB PD adapters and chargers.
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This Product is Covered by Patents and/or Pending Patent Applications.
August 2018

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InnoSwitch3-Pro
DRAIN
(D)
UNDER/OVER
INPUT VOLTAGE (V)
PRIMARY BYPASS
REGULATOR
PRIMARY BYPASS
(BPP)
LINE
INTERFACE
Power
MOSFET
SenseFET
THERMAL
SHUTDOWN
BPP
DRIVER
SOURCE
(S)
Figure 3. Primary Controller Block Diagram.
CONTROL LOGIC
RECEIVER
CONTROLLER
From
Secondary
Controller
PI-8492-101217
FORWARD
(FWD)
SYNC RECTIFIER DRIVE
(SR)
VO
DETECTOR
BPSUV
REGULATOR
4.4 V
SECONDARY
BYPASS
(BPS)
VO
FluxLink
FEEDBACK
DRIVER
FW_PK
HANDSHAKE/
LATCH-OFF
CONTROL
INH
FW_PK
INH
TsMAX
OSCILLATOR/
TIMER
tOFF(MIN)
tSECINH(MAX)
SECONDARY
LATCH
VCTRL
SEC_REQ
ICTRL
+
-
VREF
+
-
Figure 4. Secondary Controller Block Diagram.
uVCC
LDO
VOUT
VB/D
CHARGE PUMP /
LOAD DISCHARGE
VOUT
DAC8
ILIM
DAC8
DIGITAL
CONTROLLER
SDA
SCL
X40
GND IS
PI-8478-112217
2
Rev. E 08/18
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InnoSwitch3-Pro
Pin Functional Description
ISENSE (IS) Pin (Pin 1)
Connection to the power supply return output terminals. An external
current sense resistor should be connected between this and the
SECONDARY GROUND pin.
SECONDARY GROUND (GND) (Pin 2)
GND for the secondary IC. Note this is not the power supply output
GND due to the presence of the sense resistor between this and the
ISENSE pin.
NC Pin (Pin 3)
Leave open. Should not be connected to any other pins.
SECONDARY BYPASS (BPS) Pin (Pin 4)
It is the connection point for an external bypass capacitor for the
secondary IC supply.
I2C Clock (SCL) Pin (Pin 5)
I2C serial communication protocol clock line sourced by the Bus
master (max 700 kHz).
I2C Serial Data (SDA) Pin (Pin 6)
I2C serial communication protocol data line sourced by the Bus
master (max 700 kHz).
External VCC Supply (uVCC) Pin (Pin 7)
This is a 3.6 V supply for an external controller.
VBUS Series Switch Drive and Load Discharge (VB/D) Pin (Pin 8)
VBUS enable and driver for NMOS gate for VOUT to VBUS pass
MOSFETs. This pin can also be used to discharge output load voltage.
SYNCHRONOUS RECTIFIER DRIVE (SR) Pin (Pin 9)
Gate driver output and connection to external SR FET gate terminal.
OUTPUT VOLTAGE (VOUT) Pin (Pin 10)
Connected directly to the output voltage providing current for the
secondary IC and sense for output voltage regulation. Also active
pull-down current source for minimum load.
FORWARD (FWD) Pin (Pin 11)
The connection point to the switching node of the transformer output
winding providing information on the primary switch timing plus
providing power for the secondary IC when VOUT is below a
threshold value.
V 13
BPP 14
NC 15
S 16-19
D 24
12 NC
11 FWD
10 VOUT
9 SR
8 VB/D
7 uVCC
6 SDA
5 SCL
4 BPS
3 NC
2 GND
1 IS
Figure 5. Pin Configuration.
PI-8381-101617
NC Pin (Pin 12)
Leave open. Should not be connected to any other pins.
UNDER/OVER INPUT VOLTAGE (V) Pin (Pin 13)
A high-voltage pin connected to the AC or DC side of the input bridge
for detecting under and overvoltage conditions at the power supply
input. When connected to the AC side of the bridge, a high-voltage
switch is opened when not sensing to reduce power consumption.
This pin should be tied to GND to disable UV/OV protection.
PRIMARY BYPASS (BPP) Pin (Pin 14)
It is the connection point for an external bypass capacitor for the
primary IC supply. This is also the ILIM selection pin for choosing
standard ILIM or ILIM+1.
NC Pin (Pin 15)
Leave open. Should not be connected to any other pins.
SOURCE (S) Pin (Pin 16-19)
These pins are the power MOSFET source connection. It is also
ground reference for primary BYPASS pin.
DRAIN (D) Pin (Pin 24)
This pin is the power MOSFET drain connection.
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Rev. E 08/18

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InnoSwitch3-Pro
InnoSwitch3-Pro Functional Description
The InnoSwitch3-Pro combines a high-voltage power MOSFET switch,
along with both primary-side and secondary-side controllers in one
device.
The architecture incorporates a novel inductive coupling feedback
scheme using the package lead frame and bond wires to provide a
safe, reliable, and low-cost means to communicate accurate direct
sensing of the output voltage and output current on the secondary IC
to the primary IC.
The primary controller on InnoSwitch3-Pro is a Quasi-Resonant (QR)
flyback controller that has the ability to operate in continuous
conduction mode (CCM). The controller uses both variable frequency
and variable current control schemes. The primary controller consists
of a frequency jitter oscillator; a receiver circuit magnetically coupled to
the secondary controller, a current limit controller, 5 V regulator on
the PRIMARY BYPASS pin, audible noise reduction engine for light
load operation, bypass overvoltage detection circuit, a lossless input
line sensing circuit, current limit selection circuitry, over-temperature
protection, leading edge blanking, secondary output diode/SR FET
short protection circuit and a 650 V / 725 V power MOSFET.
The InnoSwitch3-Pro secondary controller consists of a transmitter
circuit that is magnetically coupled to the primary receiver, an I2C
interface to control power supply parameters and telemetry functions,
a 4.4 V regulator on the SECONDARY BYPASS pin, synchronous
rectifier MOSFET driver, QR mode circuit, oscillator and timing
functions, and a host of integrated protection features.
Figure 3 and Figure 4 show the functional block diagrams of the
primary and secondary controller with the most important features.
Primary Controller
InnoSwitch3-Pro has variable frequency QR controller plus CCM/CrM/
DCM operation for enhanced efficiency and extended output power
capability.
PRIMARY BYPASS Pin Regulator
The PRIMARY BYPASS pin has an internal regulator that charges the
PRIMARY BYPASS pin capacitor to VBPP by drawing current from the
DRAIN pin whenever the power MOSFET is off. The PRIMARY
BYPASS pin is the internal supply voltage node. When the power
MOSFET is on, the device operates from the energy stored in the
PRIMARY BYPASS pin capacitor.
In addition, a shunt regulator clamps the PRIMARY BYPASS pin
voltage to VSHUNT when current is provided to the PRIMARY BYPASS
pin through an external resistor. This allows the InnoSwitch3-Pro to
be powered externally through a bias winding, decreasing the no-load
consumption to less than 30 mW in a 5 V output design.
Primary Bypass ILIM Programming
InnoSwitch3-Pro ICs allows the user to adjust current limit (ILIM)
settings through the selection of the PRIMARY BYPASS pin capacitor
value. A ceramic capacitor can be used.
There are 2 selectable capacitor sizes - 0.47 mF and 4.7 mF for setting
standard and increased ILIM settings respectively.
Primary Bypass Undervoltage Threshold
The PRIMARY BYPASS pin undervoltage circuitry disables the power
MOSFET when the PRIMARY BYPASS pin voltage drops below ~4.5 V
(VBPP - VBP(H)) in steady-state operation. Once the PRIMARY BYPASS
pin voltage falls below this threshold, it must rise to VBP to re-enable
turn-on of the power MOSFET.
Primary Bypass Output Overvoltage Function
The PRIMARY BYPASS pin has a latching OV protection feature. A
Zener diode in parallel with the resistor in series with the PRIMARY
BYPASS pin capacitor is typically used to detect an overvoltage on the
primary bias winding and activate the protection mechanism. In the
event that the current into the PRIMARY BYPASS pin exceeds ISD, the
device will latch-off or disable the power MOSFET switching for a time
t ,AR(OFF) after which time the controller will restart and attempt to
return to regulation.
VOUT OV protection is also included as an integrated feature on the
secondary controller.
Over-Temperature Protection
The thermal shutdown circuitry senses the primary MOSFET die
temperature. The threshold is set to TSD with either a hysteretic or
latch-off response.
Hysteretic response: If the die temperature rises above the threshold,
the power MOSFET is disabled and remains disabled until the die
temperature falls by TSD(H) at which point switching is re-enabled. A
large amount of hysteresis is provided to prevent over-heating of the
PCB due to a continuous fault condition.
Latch-off response: If the die temperature rises above the threshold
the power MOSFET is disabled. The latching condition is reset by
bringing the PRIMARY BYPASS pin below VBPP(RESET) or by going below
the UNDER/OVER INPUT VOLTAGE pin UV (IUV-) threshold.
1.05
1.0
0.95
0.9
0.85
0.8
0.75
30 40 50 60 70 80 90 100
Steady-State Switching Frequency (kHz)
Figure 6. Normalized Primary Current vs. Frequency.
4
Rev. E 08/18
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InnoSwitch3-Pro
Current Limit Operation
The primary-side controller has a current limit threshold ramp that is
inversely proportional to the time from the end of the previous
primary switching cycle (i.e. from the time the primary MOSFET turns
off at the end of a switching cycle).
This characteristic produces a primary current limit that increases as
the switching frequency (load) increases (Figure 6).
This algorithm enables the most efficient use of the primary switch
with the benefit that this algorithm responds to digital feedback
information immediately when a feedback switching cycle request is
received.
At high load, switching cycles have a maximum current approaching
100% ILIM. This gradually reduces to 30% of the full current limit as
load decreases. Once 30% current limit is reached, there is no
further reduction in current limit (since this is low enough to avoid
audible noise). The time between switching cycles will continue to
increase as load reduces.
Jitter
The normalized current limit is modulated between 100% and 95% at
a modulation frequency of fM this results in a frequency jitter of
~7 kHz with average frequency of ~100 kHz.
Auto-Restart
In the event a fault condition occurs (such as an output overload,
output short-circuit, or external component/pin fault), the
InnoSwitch3-Pro enters auto-restart (AR) or latches off. The latching
condition is reset by bringing the PRIMARY BYPASS pin below ~ 3 V
or by going below the UNDER/OVER INPUT VOLTAGE pin UV (IUV-)
threshold.
In auto-restart, switching of the power MOSFET is disabled for t .AR(OFF)
There are 2 ways to enter auto-restart:
1. Continuous secondary requests at above the overload detection
frequency (~110 kHz) for longer than 82 ms (tAR).
2. No requests for switching cycles from the secondary for > tAR(SK).
The second is included to ensure that if communication is lost, the
primary tries to restart. Although this should never be the case in
normal operation, it can be useful when system ESD events (for
example) causes a loss of communication due to noise disturbing the
secondary controller. The issue is resolved when the primary restarts
after an auto-restart off-time.
The first auto-restart off-time is short (t ).AR(OFF)SH This short auto-
restart time is to provide quick recovery under fast reset conditions.
The short auto-restart off-time allows the controller to quickly check to
determine whether the auto-restart condition is maintained beyond
t .AR(OFF)SH
The auto-restart is reset as soon as an AC reset occurs.
SOA Protection
In the event that there are two consecutive cycles where the ILIM is
reached within ~500 ns (the blanking time + current limit delay time),
the controller will skip 2.5 cycles or ~25 ms (based on full frequency
of 100 kHz). This provides sufficient time for the transformer to reset
with large capacitive loads without extending the start-up time.
Input Line Voltage Monitoring
The UNDER/OVER INPUT VOLTAGE pin is used for input undervoltage
and overvoltage sensing and protection.
A 4 Mresistor is tied between the high-voltage DC bulk capacitor
after the bridge (or to the AC side of the bridge rectifier for fast AC
reset) and the UNDER/OVER INPUT VOLTAGE pin to enable this
functionality. This function can be disabled by shorting the UNDER/
OVER INPUT VOLTAGE pin to primary GND.
At power-up, after the primary bypass capacitor is charged and the
ILIM state is latched, and prior to switching, the state of the UNDER/
OVER INPUT VOLTAGE pin is checked to confirm that it is above the
brown-in and below the overvoltage shutdown thresholds.
In normal operation, if the UNDER/OVER INPUT VOLTAGE pin current
falls below the brown-out threshold and remains below brown-in for
longer than tUV-, the controller enters auto-restart. Switching will only
resume once the UNDER/OVER INPUT VOLTAGE pin current is above
the brown-in threshold.
In the event that the UNDER/OVER INPUT VOLTAGE pin current is
above the overvoltage threshold, the controller will also enter
auto-restart. Again, switching will only resume once the UNDER/
OVER INPUT VOLTAGE pin current has returned to within its normal
operating range.
The input line UV/OV function makes use of a internal high-voltage
(VV) MOSFET on the UNDER/OVER INPUT VOLTAGE pin to reduce
power consumption. The controller samples the input line at light
load conditions when the time between switching cycles is 50 msec
or more. At >50 msec between switching cycles, the high-voltage
MOSFET will remain on making sensing continuous.
Primary-Secondary Handshake
At start-up, the primary-side initially switches without any feedback
information (this is very similar to the operation of a standard
TOPSwitch™, TinySwitch™ or LinkSwitch™ controllers).
If no feedback signals are received during the auto-restart on-time
(tAR), the primary goes into auto-restart mode. Under normal
conditions, the secondary controller will power-up via the FORWARD
pin or from the OUTPUT VOLTAGE pin and take over control. From
this point onwards the secondary controls switching.
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5
Rev. E 08/18