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OB2530N
High Precision CC/CV Primary-Side Power Switch
GENERAL DESCRIPTION
OB2530N is a high performance offline PSR
power switch 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 75mW standby power to meet strict
standby power standard.
OB2530N 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.
OB2530N is offered in SOP7 packages.
FEATURES
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
Integrated 1A 620V MOSFET
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 and low operating
current
Comprehensive protection coverage with
auto-recovery
On-chip 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
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_2530N02

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OB2530N
High Precision CC/CV Primary-Side Power Switch
GENERAL INFORMATION
Pin Configuration
The pin map is shown as below for SOP7.
Ordering Information
Part Number
Description
OB2530NCP
SOP7, Pb-free, Tube
OB2530NCPA
SOP7, Pb-free in T&R
Package Dissipation Rating
Package
RθJA (/W)
SOP7
95
Recommended Operating Condition
Symbol Parameter
Range
VDD
VDD Supply Voltage 8 to 25V
Absolute Maximum Ratings
Parameter
Value
Drain Voltage (off state)
-0.3V to Bvdss
VDD Voltage
-0.3 to 28V
FB Input Voltage
-0.3 to 7V
CS Input Voltage
-0.3 to 7V
Min/Max Operating Junction
Temperature TJ
Operating
Ambient
Temperature TA
Min/Max
Storage
Temperature Tstg
Lead
Temperature
(Soldering, 10secs)
-40 to 150
-20 to 85
-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.
Output Power Table
Part Number
90Vac~264Vac
OB2530NCP
6W
OB2530N X X
X
High Precision CC/CV Primary-Side PWM
Power Switch
Package Package Pb free Packing
C:SOP7
P:Pb-free
Blank:Tube
A: Tape/Reel
©On-Bright Electronics
Confidential
-2-
Preliminary Datasheet
OB_DOC_DS_2530N02

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Marking Information
OB2530N
High Precision CC/CV Primary-Side Power Switch
YWWZZZ
OB2530NCP
S
Y:Year Code
WW:Week Code(01-52)
ZZZ:Lot Code
C:SOP7 Package
P:Pb-free Package
S:Internal Code(Optional)
TERMINAL ASSIGNMENTS
Pin Num. Pin Name I/O Description
1
VDD
P Power Supply
2 NC
3
FB
I
The voltage feedback from auxiliary winding. Connected to resistor
divider from auxiliary winding reflecting output voltage.
4 CS I Power MOSFET source
5/6
Drain
O Drain of internal power MOSFET
7
GND
P Ground
©On-Bright Electronics
Confidential
-3-
Preliminary Datasheet
OB_DOC_DS_2530N02