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OB2560
High Precision CC/CV Primary-Side Controller
GENERAL DESCRIPTION
OB2560 is a high performance offline PSR
controller for low power AC/DC charger and
adapter applications. It operates in primary-side
sensing and regulation. Consequently,
opto-coupler and TL431 could be eliminated.
Proprietary Constant Voltage (CV) and Constant
Current (CC) control is integrated as shown in the
figure below.
In CC control, the current and output power setting
can be adjusted externally by the sense resistor
Rs at CS pin. In CV control, multi-mode operations
are utilized to achieve high performance and high
efficiency. In addition, good load regulation is
achieved by the built-in cable drop compensation.
Device operates in PFM in CC mode at large load
condition and it operates in PWM with frequency
reduction at light/medium load. The chip
consumes very low operation current. It achieves
less than 100mW standby power to meet strict
standby power standard.
OB2560 offers comprehensive protection
coverage with auto-recovery feature including
Cycle-by-Cycle current limiting, VDD over voltage
protection, feedback loop open protection, short
circuit protection, built-in leading edge blanking,
VDD under voltage lockout (UVLO), OTP etc.
OB2560 is offered in SOT23-6 package.
FEATURES
Driving MOSFET
Primary-side sensing and regulation without
TL431 and opto-coupler
High precision constant voltage and current
regulation at universal AC input
Multi-mode PWM/PFM operation for efficiency
improving
Good dynamic response
Programmable CV and CC regulation
Built-in primary winding inductance
compensation
Programmable cable drop compensation
No need for control loop compensation
Audio noise free operation
Built-in leading edge blanking (LEB)
Ultra low start-up current (typ. 1uA) and low
operating current (typ. 650uA)
Comprehensive protection coverage with
auto-recovery
Precise external OTP
VDD over voltage protection
VDD under voltage lockout with
hysteresis (UVLO)
Cycle-by-Cycle current limiting
Feedback loop open protection
Output short circuit protection
APPLICATIONS
Low Power AC/DC offline SMPS for
Cell Phone Charger
Digital Cameras Charger
Small Power Adapter
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement
Figure.1. Typical CC/CV Curve
TYPICAL APPLICATION
~ ++
AC
VO
NS + CO
NP
FB VDD
GND GATE
RT CS
OB2560
+
NAUX
RS
©On-Bright Electronics
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Preliminary datasheet
OB_DOC_DS_256000

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GENERAL INFORMATION
Pin Configuration
The pin map is shown as below for SOT23-6.
Ordering Information
Part Number
Description
OB2560MP
SOT23-6, Pb-free, T&R
Package Dissipation Rating
Package
RθJA (/W)
SOT23-6
200
OB2560
High Precision CC/CV Primary-Side Controller
Absolute Maximum Ratings
Parameter
Value
VDD Voltage
-0.3 to 30V
FB Input Voltage
-0.3 to 7V
RT Input Voltage
-0.3 to 7V
CS Input Voltage
-0.3 to 7V
GATE Input Voltage
-0.3 to 24V
Min/Max Operating Junction
Temperature TJ
Min/Max
Storage
Temperature Tstg
Lead
Temperature
(Soldering, 10secs)
-40 to 150
-55 to 150
260
Note: Stresses beyond those listed under “absolute maximum
ratings” may cause permanent damage to the device. These
are stress ratings only, functional operation of the device at
these or any other conditions beyond those indicated under
“recommended operating conditions” is not implied. Exposure
to absolute maximum-rated conditions for extended periods
may affect device reliability.
Recommended operating condition
Symbol Parameter
Range
VCC
VCC Supply Voltage 9 to 22V
TA
Operating Ambient
Temperature
-20 to 85
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Preliminary datasheet
OB_DOC_DS_256000

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Marking Information
OB2560
High Precision CC/CV Primary-Side Controller
560YWW
. ZZZ s
Y:Year Code
WW:Week Code(01-52)
ZZZ: Lot code
s: Internal code
TERMINAL ASSIGNMENTS
Pin Num Pin Name
1 FB
2 GND
3 RT
4 CS
I/O Description
I
The voltage feedback from auxiliary winding. Connected to resistor
divider from auxiliary winding reflecting output voltage.
P Ground
I
Connected through a NTC resistor to ground for over temperature
shutdown
I Power MOSFET source
5
GATE
O Gate driver of power MOSFET.
6
VDD
P Power Supply
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Preliminary datasheet
OB_DOC_DS_256000

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BLOCK DIAGRAM
OB2560
High Precision CC/CV Primary-Side Controller
EA
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Preliminary datasheet
OB_DOC_DS_256000

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OB2560
High Precision CC/CV Primary-Side Controller
ELECTRICAL CHARACTERISTICS
(TA = 25, VDD=15V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Supply Voltage (VDD) Section
I start-up
Start up current
VDD=UVLO_OFF-1V
I static
Static current
UVLO(OFF) VDD under voltage lockout exit
UVLO(ON)
VDD under voltage lockout enter
VDD_OVP
VDD over voltage protection
Max. Operating
Voltage
Current Sense Input Section
TLEB
LEB time
TD_OC
OCP propagation delay
Vth_ocp_min Minimum over current threshold
Vth_ocp_max Maximum over current threshold
Vcs_mini
Minimum CS threshold
Ton_max
Maximum Ton
Td_oc
OCP propagation delay
FB Input Section
Vref_fb
Reference voltage for feedback
threshold
Tpause_min Minimum Toff
F_min
Minimum frequency
Icomp_cable
Maximum cable compensation
current
Gate Drive Section
V_clamp
Output clamp voltage level
Tr Output rising time
CL=0.22nF
Tf Output falling time
CL=0.22nF
Output Over Voltage Protection
V_OVP
Output Over voltage threshold
RT Section
I_otp
RT pin source current
V_otp
Over temperature trigger voltage
Min Typ. Max Unit
5 15
0.65 1.0
13.8 14.8 15.8
7.0 7.6 8.2
25.2 26.2 27.2
uA
mA
V
V
V
24 V
330
100
485 500 515
580
100
50
100
ns
ns
mV
mV
mV
us
ns
2.475 2.50 2.525 V
2.0
400 450 500
us
Hz
22 24 26 uA
9.5 11 12.5 V
180 ns
30 ns
2.9 3.0 3.1 V
150 uA
2.0 V
©On-Bright Electronics
Confidential
-5-
Preliminary datasheet
OB_DOC_DS_256000