OB2263 Current Mode PWM IC – SOT23-6 Flyback Controller
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OB2263 Current Mode PWM Control IC – Offline Flyback Controller (SOT23-6)
The OB2263 is a highly integrated current-mode PWM controller designed for offline flyback converters up to 30 W. Housed in a compact SOT23-6 package, it is widely used in standby supplies and auxiliary rails on crypto-miner PSUs and hashboards. Its built-in frequency shuffling technology spreads switching-noise energy across a wider band, improving EMI performance without external filtering components.
Low-Standby & Audio-Noiseless Operation
In light-load or no-load conditions the OB2263 enters an extended burst mode that cuts standby power consumption to a minimum — important for PSU designs targeting efficiency benchmarks. The burst-mode threshold is tuned to keep the switching frequency above the audible range, so there is no transformer whine during standby.
Comprehensive On-Chip Protection
The IC includes cycle-by-cycle overcurrent protection (OCP), overload protection (OLP) with auto-recovery, VDD overvoltage clamping, and under-voltage lockout (UVLO). These safeguards protect both the controller and the downstream power components during fault events, reducing the chance of cascading failures on the board.
OB2263 PWM IC Specifications
| Parameter | Value |
|---|---|
| Part Number | OB2263 |
| Topology | Offline flyback (current mode) |
| Package | SOT23-6 |
| Max Output Power | Sub-30 W |
| Switching Frequency | Externally programmable |
| EMI Feature | Frequency shuffling |
| Standby Mode | Extended burst (audio noiseless) |
| Protection | OCP, OLP, OVP clamp, UVLO, auto-recovery |
| Slope Compensation | Internal sync |
| Startup Current | Low |
Related PWM Controllers & Power ICs
- OB2268CP PWM IC – Whatsminer P222B PSU
- OB2276CP PWM IC – Whatsminer Power Management
- NCP1252A Current Mode PWM Controller
- FA5527 Switching Power Supply Control IC
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