NCP1351ADR2G

Product Summary

The NCP1351ADR2G is a current-mode controller targeting low power off-line flyback Switched Mode Power Supplies (SMPS) where cost is of utmost importance. Based on a fixed peak current technique (quasi-fixed TON), the NCP1351ADR2G decreases its switching frequency as the load becomes lighter. As a result, a power supply using the NCP1351ADR2G naturally offers excellent no-load power consumption, while optimizing the efficiency in other loading conditions. When the frequency decreases, the peak current is gradually reduced down to approximately 30% of the maximum peak current to prevent transformer mechanical resonance. The risk of acoustic noise is thus greatly diminished while keeping good standby power performance. The applications of the NCP1351ADR2G include Auxiliary Power Supply, Printer, Game Stations, Low-Cost Adapters and Off-line Battery Charger.

Parametrics

NCP1351ADR2G absolute maximum ratings: (1)VSUPPLY, Maximum Supply on VCC Pin 6: -0.3 to 28 V; (2)ISUPPLY, Maximum Current in VCC Pin 6: 20 mA; (3)VDRV, Maximum Voltage on DRV Pin 5: -0.3 to 20 V; (4)IDRV, Maximum Current in DRV Pin 5: ±400 mA; (5)VMAX, Supply Voltage on all pins, except Pin 6 (VCC), Pin 5 (DRV): -0.3 to 10 V; (6)IMAX, Maximum Current in all Pins Except Pin 6 (VCC) and Pin 5 (DRV): ±10 mA; (7)IFBmax, Maximum Injected Current in Pin 1 (FB): 0.5 mA; (8)RGmin, Minimum Resistive Load on DRV Pin: 33 kΩ; (9)RθJA, Thermal Resistance Junction-to-Air: 200℃/W; (10)TJMAX, Maximum Junction Temperature: 150℃; (11)Storage Temperature Range: -60 to +150℃; (12)ESD Capability, Human Body Model: 2 kV; (13)ESD Capability, Machine Model: 200 V.

Features

NCP1351ADR2G features: (1)Quasi-fixed TON, Variable TOFF Current Mode Control; (2)Extremely Low Current Consumption at Startup; (3)Peak Current Compression Reduces Transformer Noise; (4)Primary or Secondary Side Regulation; (5)Dedicated Latch Input for OTP, OVP; (6)Programmable Current Sense Resistor Peak Voltage; (7)Natural Frequency Dithering for Improved EMI Signature; (8)Easy External Over Power Protection (OPP); (9)Undervoltage Lockout; (10)Very Low Standby Power via Off-time Expansion; (11)Internal Temperature Shutdown; (12)SOIC-8 Package.

Diagrams