OB2230X

GENERAL DESCRIPTION

OB2230x 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.

OB2230x 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.

OB2230x is offered in DIP8 packages.

Figure.1. Typical CC/CV Curve

FEATURES

n Primary-side sensing and regulation without TL431 and opto-coupler

n High precision constant voltage and current regulation at universal AC input

n Multi-mode PWM/PFM operation for efficiency improving

n Good dynamic response

n Programmable CV and CC regulation

n Built-in primary winding inductance compensation

n Programmable cable drop compensation

n No need for control loop compensation

n Audio noise free operation

n Built-in leading edge blanking (LEB)

n Ultra low start-up current and low operating current

n Comprehensive protection coverage with auto-recovery

         l VDD over voltage protection

l VDD under voltage lockout with hysteresis (UVLO)

l Cycle-by-Cycle current limiting

l Feedback loop open protection

l  Output short circuit protection

l  On-chip OTP

APPLICATIONS

Low Power AC/DC offline SMPS for

n Cell Phone Charger

n Digital Cameras Charger

n Small Power Adapter

n Auxiliary Power for PC, TV etc.

n Linear Regulator/RCC Replacement

 

TYPICAL APPLICATION

 

GENERAL INFORMATION

Pin Configuration

The pin map is shown as below for DIP8.

 

Ordering Information

Part Number	Description
OB2230TAP-H	DIP8, Halogen-free, Tube
OB2230UAP-H	DIP8, Halogen-free, Tube

Package Dissipation Rating

Package	RθJA (℃/W)
DIP8	75

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
INV Input Voltage	-0.3 to 7V
CS Input Voltage	-0.3 to 7V
Min/Max Operating Junction   Temperature TJ	-40 to 150 ℃
Operating Ambient Temperature TA	-20 to 85 ℃
Min/Max Storage Temperature Tstg	-55 to 150 ℃
Lead Temperature (Soldering,   10secs)	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	176Vac~264Vac
OB2230TAP-H	18W	24W
OB2230UAP-H	30W	40W

 

Marking Information

              

TERMINAL ASSIGNMENTS

OB2230TAP-H

Pin   Num.	Pin   Name	I/O	Description
1	VDD	P	Power   Supply
2	GND	P	Ground
3	INV	I	The   voltage feedback from auxiliary winding. Connected to resistor divider from   auxiliary winding reflecting output voltage.
4	CS	I	Power   MOSFET source
5/6/7/8	Drain	O	Drain   of internal power MOSFET

 

OB2230UAP-H

Pin   Num.	Pin   Name	I/O	Description
1	GND	P	Ground
2	CS	I	Power   MOSFET source
3	INV	I	The   voltage feedback from auxiliary winding. Connected to resistor divider from   auxiliary winding reflecting output voltage.
4	VDD	P	Power   Supply
5/6/7/8	Drain	O	Drain   of internal power MOSFET