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OB2520 Datasheet

High Precision CC/CV Primary-Side Controller

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OB2520
High Precision CC/CV Primary-Side Controller
GENERAL DESCRIPTION
OB2520 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, PFM operations are
utilized to achieve high performance and high
efficiency. In addition, good load regulation is
achieved by the built-in cable drop compensation.
The chip consumes very low operation current
(typical 300uA), it can achieve less than 30mW
standby power to meet strict standby power
standard.
OB2520 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), etc.
OB2520 is offered in SOT23-6 package.
Product Specification
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
„ Built-in Primary winding inductance
compensation
„ Programmable Cable Drop Compensation
„ Driver BJT Switch
„ Ultra Low Start-up Current (Typ. 1uA)
„ VDD Over Voltage Protection
„ Built-in Feedback Loop Open Protection
„ Built-in Short Circuit Protection
„ Built-in Leading Edge Blanking (LEB)
„ Cycle-by-Cycle Current Limiting
„ VDD Under Voltage Lockout with Hysteresis
(UVLO)
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
+ CO
NS
NP
+
VDD GND
FB BASE
VC CS
OB2520
RS
NAUX
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_252000
On-Bright Electronics
On-Bright Electronics



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