1377B

Product Summary

The 1377B is a PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation. The 1377B combines a true current mode modulator and a demagnetization detector which ensures full borderline/ critical Conduction Mode in any load/line conditions together with minimum drain voltage switching (Quasi-Resonant operation). Due to its inherent skip cycle capability, the 1377B controller enters burst mode as soon as the power demand falls below a predetermined level. As this happens at low peak current, no audible noise can be heard.

Parametrics

1377B absolute maximum ratings: (1)Power Supply Voltage, VCC, Drv: 16 V; (2)Maximum Voltage on all other pins except Pin 8 (HV), Pin 6 (VCC) and Pin 5 (Drv): -0.3 to 10 V; (3)Maximum Current into all pins except VCC (6), HV (8) and Demag (1) when 10 V ESD diodes are activated: 5.0 mA; (4)Maximum Current in Pin 1, Idem: +3.0/.2.0 mA; (5)Thermal Resistance, Junction-to-Case, RθJC: 57℃/W; (6)Thermal Resistance, Junction-to-Air, SOIC Version RθJA: 178℃/W; (7)Thermal Resistance, Junction-to-Air, PDIP Version RθJA: 100℃/W; (8)Maximum Junction Temperature, TJMAX: 150℃; (9)Temperature Shutdown: 155℃; (10)Hysteresis in Shutdown: 30℃; (11)Storage Temperature Range : -60 to +150℃; (12)ESD Capability, HBM Model (All pins except VCC and HV): 2.0 kV; (13)ESD Capability, Machine Model: 200 V; (14)Maximum Voltage on Pin 8 (HV), Pin 6 (VCC) Decoupled to Ground with 10μF, VHV: 500 V.

Features

1377B features: (1)Pb-Free Package is Available; (2)Free-Running Borderline/Critical Mode Quasi-Resonant Operation; (3)Latched Overvoltage Protection; (4)Auto-Recovery Short-Circuit Protection Via UVLO Crossover; (5)External Latch Triggering, e.g. Via Overtemperature Signal; (6)Current-Mode with Adjustable Skip Cycle Capability; (7)Internal 1.0 ms Soft-Start; (8)Internal Temperature Shutdown; (9)Internal Leading Edge Blanking; (10)500 mA Peak Current Source/Sink Capability; (11)Under Voltage Lockout Level of 12.5 V (On) and 7.5 V (Min); (12)Direct Optocoupler Connection; (13)SPICE Models Available for TRANsient Analysis; (14)Internal Minimum TOFF.

Diagrams