NCP1337P

Product Summary

The NCP1337P 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). The transformer core reset detection of the NCP1337P is done internally, without using any external signal, due to the Soxyless concept. The frequency of the NCP1337P is internally limited to 130 kHz, preventing the controller to operate above the 150 kHz CISPR.22 EMI starting limit. By monitoring the feedback pin activity, the controller enters ripple mode as soon as the power demand falls below a predetermined level. As each restart of the NCP1337P is softened by an internal soft.start, and as the frequency cannot go below 25 kHz, no audible noise can be heard.

Parametrics

NCP1337P maximum ratings: (1)Voltage on Pin 8 (HV) when Pin 6 (VCC) is Decoupled to Ground with 10 μF VHV: -0.3 to 500 V; (2)Maximum Current in Pin 8 (HV): 20 mA; (3)Power Supply Voltage, Pin 6 (VCC) and Pin 5 (DRV) VCCmax: -0.3 to 20 V; (4)Maximum Current in Pin 6 (VCC): μ30 mA; (5)Maximum Voltage on all Pins except Pin 8 (HV), Pin 6 (VCC) and Pin 5 (DRV): -0.3 to 10 V; (6)Maximum Current into all Pins except Pin 8 (HV), Pin 6 (VCC) and Pin 5 (DRV): ±10 mA; (7)Maximum Current into Pin 6 (DRV) during ON Time and TBLANK: ±1.0 A; (8)Maximum Current into Pin 6 (DRV) after TBLANK during OFF Time: ±15 mA; (9)Thermal Resistance, Junction.to.Case RθJC: 57 ℃/W; (10)Thermal Resistance, Junction.to.Air, SOIC Version RθJA: 178 ℃/W; (11)Thermal Resistance, Junction.to.Air, DIP Version RθJA: 100 ℃/W; (12)Maximum Junction Temperature TJMAX: 150 ℃; (13)Operating Temperature Range: -40 to +125 ℃; (14)Storage Temperature Range: -60 to +150 ℃; (15)ESD Capability, HBM Model per Mil.std.883, Method 3015 (All Pins except HV): 2.0 kV; (16)ESD Capability, Machine Model: 200 V.

Features

NCP1337P features: (1)Free-Running Borderline/Critical Mode Quasi-Resonant Operation; (2)Current-Mode; (3)Soft Ripple Mode with Minimum Switching Frequency for Standby; (4)Auto-Recovery Short-Circuit Protection Independent of Auxiliary Voltage; (5)Overvoltage Protection; (6)Brown-Out Protection; (7)Two Externally Triggerable Fault Comparators (one for a disable function, and the other for a permanent latch); (8)Internal 4.0 ms Soft-Start; (9)500 mA Peak Current Drive Sink Capability; (10)130 kHz Max Frequency; (11)Internal Leading Edge Blanking; (12)Internal Temperature Shutdown; (13)Direct Optocoupler Connection; (14)Dynamic Self-Supply with Levels of 12 V (On) and 10 V (Off); (15)SPICE Models Available for TRANsient and AC Analysis; (16)These are Pb-Free Devices.

Diagrams