Description
Marked "OB2338AP" on the package, this is On-Bright Electronics' OB2338AP, a high-performance Primary-Side Regulation (PSR) offline PWM power switch. It integrates a high-precision PWM controller together with an internal high-voltage power MOSFET into a single IC. Designed for low-power flyback power supplies, it eliminates the need for an optocoupler and secondary-side reference circuit (like a TL431), reducing component count and overall board space.
The OB2338AP features built-in Constant Voltage (CV) and Constant Current (CC) control, built-in soft-start, frequency shuffling for low EMI noise, and comprehensive protections including open-loop protection, short-circuit protection, and over-voltage protection.
Key Specifications
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Type: Primary-Side Regulation (PSR) Offline PWM Power Switch
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Manufacturer: On-Bright Electronics
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Package Marking: OB2338AP
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Package: DIP-8 (8-pin through-hole)
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Internal MOSFET Breakdown Voltage ($V_{DS}$): 650V
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Max Output Power: 12W (Universal AC input 85VAC–265VAC adapter) / 15W (Open frame)
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Supply Voltage Range ($V_{DD}$): 10V to 28V (UVLO turn-on threshold ~16.5V)
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Switching Frequency: ~65kHz (with frequency shuffling)
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CV/CC Regulation Accuracy: ±5%
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Operating Junction Temperature Range: -40°C to +150°C
Common Applications
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Low-power AC/DC power adapters and wall chargers
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Auxiliary power supplies for home appliances and industrial controllers
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Standby power modules for TV, monitors, and set-top boxes
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LED lighting drivers and battery chargers
Package Includes
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1 x On-Bright OB2338AP Offline PWM Power Switch IC (DIP-8)