1207AP

Product Summary

The 1207AP combines a true current mode modulator and a demagnetization detector to ensure full borderline/critical Conduction Mode in any load/line conditions and minimum drain voltage switching (Quasi-Resonant operation). Due to its inherent skip cycle capability, the controller of the 1207AP 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. For the 1207AP an internal 8.0 μs timer prevents the free-run frequency to exceed 125 kHz (therefore below the 150 kHz CISPR-22 EMI starting limit), while the skip adjustmentcapability lets the user select the frequency at which the burst foldbacktakes place. For the 1207AP, the internal timer duration is reduced to4.5 μs to allow operation at higher frequencies (up to 200 kHz).

Parametrics

1207AP maximum ratings: (1)Maximum Voltage on Pin 5 (Drv): 20 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 for 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)Maximum Junction Temperature TJMAX: 150 ℃; (8)Temperature Shutdown: - 155 ℃; (9)Hysteresis in Shutdown: - 30 ℃; (10)Maximum Voltage on Pin 8 (HV), Pin 6 (VCC) decoupled to ground with 10 μF VHVMAX 500 V; (11)Minimum Voltage on Pin 8 (HV), Pin 6 (VCC) decoupled to ground with 10 μF VHVMIN 40 V.

Features

1207AP featrures: (1)Free-Running Borderline/Critical Mode Quasi-Resonant Operation; (2)Current-Mode with Adjustable Skip-Cycle Capability; (3)No Auxiliary Winding VCC Operation; (4)Auto-Recovery Overcurrent Protection; (5)Latching Overvoltage Protection; (6)External Latch Triggering, e.g. Via Overtemperature Signal; (7)500 mA Peak Current Source/Sink Capability; (8)Undervoltage Lockout for VCC Below 10 V; (9)Internal 1.0 ms Soft-Start; (10)Internal 8.0 s Minimum TOFF for NCP1207A, 4.5 s Minimum TOFF for NCP1207B; (11)Adjustable Skip Level; (12)Internal Temperature Shutdown; (13)Direct Optocoupler Connection; (14)SPICE Models Available for TRANsient Analysis; (15)Pb-Free Packages are Available.

Diagrams