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OB2532
High Precision CC/CV Primary-Side PWM Controller
Product Specification
GENERAL DESCRIPTION
OB2532 is a high performance offline PWM
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 as well at
large load condition and it operates in PWM with
frequency reduction at light/medium load.
OB2532 offers power on soft start control and
protection coverage with auto-recovery features
including Cycle-by-Cycle current limiting, VDD
OVP, VDD clamp and UVLO. Excellent EMI
performance is achieved with On-Bright
proprietary frequency shuffling technique.
High precision constant voltage (CV) and constant
current (CC) can be achieved by OB2532.
.
FEATURES
„ ±5% Constant Voltage Regulation at
Universal AC input
„ High Precision Constant Current Regulation at
Universal AC input
„ Primary-side Sensing and Regulation Without
TL431 and Opto-coupler
„ Programmable CV and CC Regulation
„ Adjustable Constant Current and Output
Power Setting
„ Built-in Secondary Constant Current Control
with Primary Side Feedback
„ Built-in Adaptive Current Peak Regulation
„ Built-in Primary winding inductance
compensation
„ Programmable Cable drop Compensation
„ Power on Soft-start
„ Built-in Leading Edge Blanking (LEB)
„ Cycle-by-Cycle Current Limiting
„ VDD Under Voltage Lockout with Hysteresis
(UVLO)
„ VDD OVP
„ VDD Clamp
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
OB2532 is offered in SOT23-6 package.
Fig.1. Typical CC/CV Curve
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
-1-
Datasheet
OB_DOC_DS_2532A0

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OB2532
High Precision CC/CV Primary-Side PWM Controller
GENERAL INFORMATION
Pin Configuration
The pin map is shown as below for SOT23-6.
Ordering Information
Part Number
Description
OB2532MP
SOT23-6, Pb-free, T&R
Package Dissipation Rating
Package
RθJA (/W)
SOT23-6
200
.
Absolute Maximum Ratings
Parameter
Value
VDD Voltage
VDD Zener Clamp
Continuous Current
-0.3 to VDD_clamp
10 mA
COMP Voltage
-0.3 to 7V
CS Input Voltage
-0.3 to 7V
INV Input Voltage
-0.3 to 7V
Max Operating Junction
Temperature TJ
Min/Max Storage
Temperature Tstg
Lead Temperature
(Soldering, 10secs)
150 oC
-55 to 150 oC
260 oC
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.
©On-Bright Electronics
Confidential
-2-
Datasheet
OB_DOC_DS_2532A0

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Marking Information
OB2532
High Precision CC/CV Primary-Side PWM Controller
TERMINAL ASSIGNMENTS
Pin Num
1
2
3
Pin Name
GND
GATE
CS
4 INV
5 COMP
6 VDD
I/O Description
P Ground
O Totem-pole gate drive output for power MOSFET.
I
Current sense input. Connected to MOSFET current sensing resistor
node.
The voltage feedback from auxiliary winding. Connected to resistor
I divider from auxiliary winding reflecting output voltage. PWM duty cycle
is determined by EA output and current sense signal at pin 3.
I Loop Compensation for CV Stability
P Power Supply
©On-Bright Electronics
Confidential
-3-
Datasheet
OB_DOC_DS_2532A0