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On-Bright Electronics
On-Bright Electronics


High Precision CC/CV Primary-Side Controller

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OB2550 pdf
High Precision CC/CV Primary-Side Controller
OB2550 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 as well at
large load condition and it operates in PWM with
frequency reduction at light/medium load. The chip
consumes very low operation current, it can
achieve less than 30mW standby power to meet
strict standby power standard.
OB2550 offers comprehensive protection
coverage with auto-recovery features 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.
OB2550 is offered in SOT23-6 package.
Figure.1. Typical CC/CV Curve
Product Specification
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
Meet 30mW no load standby power standard
Good dynamic response
Programmable CV and CC Regulation
Built-in Line Voltage and Primary Winding
Inductance Compensation
Programmable Cable Drop Compensation
No Need For Control Loop Compensation
Precise Internal Over Temperature Protection
Audio Noise Free Operation
Drive BJT Switch
Built-in Leading Edge Blanking (LEB)
Ultra Low Start-up Current (Typ. 1uA) and Low
Operating Current (Typ. 360uA)
Comprehensive Protection Coverage with
VDD Over Voltage Protection
VDD Under Voltage Lockout with
Hysteresis (UVLO)
Cycle-by-Cycle Current Limiting
Feedback Loop Open Protection
Output Short Circuit Protection
Over Temperature Protection (OTP)
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
©On-Bright Electronics
Preliminary datasheet

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OB2550 pdf
Pin Configuration
The pin map is shown as below for SOT23-6.
Ordering Information
Part Number
SOT23-6, Pb-free, T&R
High Precision CC/CV Primary-Side Controller
Package Dissipation Rating
RθJA (/W)
Absolute Maximum Ratings
VDD Voltage
-0.3 to 30V
FB Input Voltage
-0.3 to 7V
CS Input Voltage
-0.3 to 7V
ED Input Voltage
-0.3 to 7V
BD Input Voltage
-0.3 to 7V
Min/Max Operating
Junction Temperature TJ
Min/Max Storage
Temperature Tstg
Lead Temperature
(Soldering, 10secs)
-40 to 150
-55 to 150
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
Preliminary datasheet

Part Number OB2550
Description High Precision CC/CV Primary-Side Controller
Maker On-Bright Electronics - On-Bright Electronics
Total Page 11 Pages
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