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AN8038 Datasheet(PDF) 3 Page - Panasonic Semiconductor |
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AN8038 Datasheet(HTML) 3 Page - Panasonic Semiconductor |
3 / 22 page Voltage Regulators AN8038, AN8038S 3 s Pin Descriptions Pin No. Symbol Description 1 TR Transformer reset. When a transformer reset is detected, i.e., a low level is input to this pin, the IC output goes high. However, the transformer reset signal is ignored during the minimum off-period determined by the CF pin. The maximum on-period is also corrected according to the current flowing out of this pin. 2 RSTB Adjusts the light-load detection level that determines the when the IC switches from RCC to discontinuous operation. When the voltage (VFB) which is I-V conversion of current feedback signal from IFB pin goes up higher than this pin, minimum off-period current at CF pin decreases, and operating frequency decreases. The detection level can be adjusted arbitrarily using an external pull-down resistor. 3 CF Connection for the capacitor that determines the on and off periods for the IC output (Out). 4 IFB Input for the current feedback signal from the power supply output photocoupler 5 CLM Input of the pulse-by-pulse overcurrent protection circuit. Normally, it will be necessary to add an external filter for this input. 6 GND Ground 7VOUT Output to drive a power MOSFET directly 8VCC Power supply. This pin watches VCC , and has operating threshold voltages for the start, stop, OVP, and OVP reset levels. Parameter Symbol Range Unit Supply voltage VCC From the stop voltage to the OVP operating voltage V s Recommended Operating Range Note) *1: When mounted on a printed circuit board: 477 mW *2: When mounted on a printed circuit board: 191 mW Parameter Symbol Rating Unit Supply voltage VCC 28 V Peak output current IOP −1, +2A Power dissipation AN8038 PD (Ta = 25°C) 500 mW (Independent IC PD (Ta = 85°C) 260 without a heat sink) AN8038S PD (Ta = 25°C) 306 * 1 PD (Ta = 85°C) 122 * 2 Operating temperature Topr −30 to +85 °C Storage temperature Tstg −55 to +150 °C s Absolute Maximum Ratings |
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