OB2510 Datasheet PDF - On-Bright Electronics

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OB2510
On-Bright Electronics

Part Number OB2510
Description High Precision CC/CV Primary-Side Controller
Page 6 Pages


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OB2510
High Precision CC/CV Primary-Side Controller
GENERAL DESCRIPTION
OB2510 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 100mW standby power.
OB2510 offers comprehensive protection
coverage with auto-recovery features including
Cycle-by-Cycle current limiting, VDD over voltage
protection, short circuit protection, built-in leading
edge blanking, VDD under voltage lockout (UVLO),
OTP etc.
OB2510 is offered in SOT23-5 package.
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
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
Audio Noise Free Operation
Drive BJT Switch
Built-in Leading Edge Blanking (LEB)
Comprehensive Protection Coverage with
auto-recovery
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)
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
NP NS + CO
FB VDD
GND
CS BD
OB2510
+
NAUX
RS
©On-Bright Electronics
Confidential
-1-
Preliminary datasheet
OB_DOC_DS_251000

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OB2510 High Precision CC/CV Primary-Side Controller OB2510
On-Bright Electronics
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