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BP3135
High Precision PSR Constant Current LED Driver
Description
The BP3135 is a high precision primary-side feedback
and regulation controller for LED lighting, it operates
in constant current control mode and is designed to
work in inductor current discontinuous conduction
mode and especially suitable for flyback convertor
under universal input. The output power of system is
recommended to less than 7W.
The BP3135 integrates 650V power MOSFET. Since
adopting primary sense and feedback control
technology, the secondary sense and feedback circuit
is eliminated. The loop compensation components are
also removed while maintaining stability overall
operating conditions. It uses patent pending source
driver architecture and demagnetization sensing
technology, the operating current is very low, and it
doesn’t need the auxiliary winding for sensing the
output current and supplying the chip. The low
component counts and small system size are realized.
Since using the proprietary high accurate current sense
method, the BP3135 realizes ±5% accuracy of LED
current along with excellent line and load regulation.
The BP3135 offers rich protection functions including
LED open/short circuit protection, CS resistor short
circuit protection, thermal regulation, VCC under
voltage protection.
Typical Application
Features
Built-in 650V Power MOSFET
Constant current control without secondary sense
and feedback circuit.
No Auxiliary winding for sensing and supplying
Ultra low operating current to improve efficiency
Universal input voltage
±5% LED current accuracy
LED short and open circuit protection
CS resistor short circuit protection
VCC under-voltage protection
Thermal regulation
Available in SOP-8 package
Applications
GU10/E27 LED bulb, spot light
Other LED lighting
NP NS
AC BP3135
4 VCC
NC 8
2 ROVP
NC 7
1 CS
DRAIN 6
3 GND DRAIN 5
BP3135_EN_DS_Rev.1.1
Figure 1. Typical application circuit for BP3135
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BP3135
High Precision PSR Constant Current LED Driver
Ordering Information
Part Number
Package
BP3135
SOP8
Operating
Temperature
-40to 105
Packing Method
Tape
4,000 Piece/Reel
Marking
BP3135
XXXXXY
WXYY
Pin Configuration and Marking Information
CS
ROVP
GND
VCC
NC
NC
DRAIN
DRAIN
XXXXXY: Lot Code
W: Sign
X: Year
YY: Week
Pin Definition
Pin No.
Name
1 CS
2 ROVP
3 GND
4 VCC
5,6 DRAIN
7,8 NC
Figure 2. Pin configuration
Description
Current sense. This pin connects a current sense resistor to GND to detect
the primary current of transformer.
Connect a ROVP resistor to GND to set the LED open voltage.
Ground
Power supply
Internal high voltage MOSFET Drain
No connection, must be floated
BP3135_EN_DS_Rev.1.1
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BP3135
High Precision PSR Constant Current LED Driver
Absolute Maximum Ratings (note1)
Symbol
Parameters
Range
Units
ICC_max VCC pin maximum sink current
5 mA
DRAIN Internal HV MOSFET drain voltage
-0.3~650
V
CS Current sense pin input voltage
-0.3~6
V
ROVP Set the LED open voltage
-0.3~6
V
PDMAX
θJA
TJ
TSTG
Power dissipation (note2)
Thermal resistance (Junction to Ambient)
Operating junction temperature
Storage temperature range
0.45
145
-40 to 150
-55 to 150
W
/W
ESD (note3)
2 kV
Note 1: Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. Under “recommended operating
conditions” the device operation is assured, but some particular parameter may not be achieved. The electrical characteristics table defines the operation
range of the device, the electrical characteristics is assured on DC and AC voltage by test program. For the parameters without minimum and maximum
value in the EC table, the typical value defines the operation range, the accuracy is not guaranteed by spec.
Note 2: The maximum power dissipation decrease if temperature rise, it is decided by TJMAX, θJA, and environment temperature (TA). The maximum power
dissipation is the lower one between PDMAX = (TJMAX - TA)/ θJA and the number listed in the maximum table.
Note 3: Human Body mode, 100pF capacitor discharge on 1.5kΩ resistor
Recommended Operation Conditions
Symbol
POUT1
POUT2
FOP
Parameter
Output power (input voltage 230V±15%)
Output power (input voltage 85V265V)
System operating frequency
Range
<10
<7
<120
Unit
W
W
kHz
BP3135_EN_DS_Rev.1.1
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BP3135
High Precision PSR Constant Current LED Driver
Electrical Characteristics (Notes 4, 5) (Unless otherwise specified, VCC=14V and TA =25 )
Symbol
Parameter
Conditions
Min. Typ. Max. Units
Supply Voltage Section
VCC_Clamp
VCC clamp voltage
1mA
17 V
VCC_ON
Turn on threshold voltage
VCC rising
14 V
V CC_UVLO Turn off threshold voltage
VCC falling
9V
IST
VCC startup current
VCC= VCC_ON - 1V
50 100 uA
IOP
VCC operating current
FOP=70kHz
100 150 uA
Current Sense Section
VCS_TH
Threshold voltage for
peak current limit
388 400 412 mV
VCS_SHORT
Current detection
threshold for the short
circuit
Output short circuit
200
mV
Leading edge blanking
TLEB
time for current sense
500 ns
TDELAY
Switch off delay time
200 ns
Switching Frequency
Minimum working
FMIN
frequency
5 kHz
FMAX
Maximum working
frequency
120 kHz
VROVP
Voltage of ROVP Pin
0.5 V
Maximum Duty Cycle
DMAX
Maximum duty cycle
42 %
MOSFET Section
RDS_ON
Static drain-source
on-resistance
VGS=15V/IDS=0.5A
9
Ω
BVDSS
Drain-source breakdown
voltage
VGS=0V/IDS=250uA 650
V
Drain-source leakage
IDSS
current
VGS=0V/VDS=650V
1 uA
Over Temperature Protection
Thermal shutdown
TSD threshold
150
Note 4: production testing of the chip is performed at 25°C.
Note 5: the maximum and minimum parameters specified are guaranteed by test, the typical value are guaranteed by design, characterization and statistical
analysis
BP3135_EN_DS_Rev.1.1
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Internal Block Diagram
BP3135
High Precision PSR Constant Current LED Driver
VCC DRAIN
9.0V 14V
17V
Thermal
Regulation
VCC HV MOS
UVLO
Reset
OCP
OVP
ROVP
GND
CC
&Logic Control
LEB
+
Current
Sense
-
400mV
CS
Figure 3. BP3135 Internal Block Diagram
Function Description
The BP3135 is a high performance power switch
specially designed for LED lighting, with patent
constant current control technology. The BP3135
integrates a 650V power MOSFET. The accurate
LED current can be realized without opto-coupler,
TL431 feedback circuit and auxiliary winding while
minimizing the external component count, lowering
the total bill of material cost.
Start Up
The start-up current in BP3135 is designed to as low
as 50uA. The VCC capacitor will be charged through
the start-up resistor when the system is powered on.
Once the VCC voltage reaches the start-up threshold,
the BP3135 will start to switch. The BP3135
integrates a 17V zener for VCC clamping. Due to the
ultra-low operating current, the auxiliary winding is
not needed to supply the IC.
Constant Current Control
Cycle-by-Cycle current sense is adopted in BP3135,
the CS is connected to the current sense comparator,
and the voltage on CS will be compared with the
internal 400mV reference voltage, the MOSFET will
be switched off when the voltage on CS reaches the
threshold. The output of the comparator includes a
500ns leading edge blanking time.
The primary peak current is given by:
I P_ PK
400 (mA)
RCS
The current in LED can be calculated by the
equation:
I OUT
I P_PK
4
NP
NS
BP3135_EN_DS_Rev.1.1
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