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AN8038 Dataheets PDF



Part Number AN8038
Manufacturers Panasonic Semiconductor
Logo Panasonic Semiconductor
Description AC-DC switching power supply controller
Datasheet AN8038 DatasheetAN8038 Datasheet (PDF)

Voltage Regulators AN8038, AN8038S AC-DC switching power supply control IC with RCC local resonance circuit for improved conformance with energy conservation laws s Overview The AN8038 and AN8038S are self-excited AC-DC switching power supply control IC that adopt RCC local resonance control. These ICs are designed to achieve high efficiency over a wide range of loads (light loads at the standby mode to heavy loads) for improved conformance with energy conservation laws, and support input level.

  AN8038   AN8038


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Voltage Regulators AN8038, AN8038S AC-DC switching power supply control IC with RCC local resonance circuit for improved conformance with energy conservation laws s Overview The AN8038 and AN8038S are self-excited AC-DC switching power supply control IC that adopt RCC local resonance control. These ICs are designed to achieve high efficiency over a wide range of loads (light loads at the standby mode to heavy loads) for improved conformance with energy conservation laws, and support input levels used worldwide. They are particularly appropriate for use in AV and OA equipments. AN8038 Unit: mm 0.5±0.1 0.51 min. 3.8±0.25 (3.45) 1 8 7 9.4±0.3 2 3 4 6.3±0.3 5 3° to 15° 7.62±0.25 0.15–0.05 +0.1 DIP008-P-0300B s Features AN8038S 5.01±0.20 • Supports improved conformance with energy conser8 5 vation laws by providing two operating modes. With external resistors, it is possible to set the operating point at which the modes change over according to the load power, as shown below. 1.Continuous (RCC) mode 1 4 High efficiency achieved with local resonance operation (zero cross detection). 2.Discontinuous mode (standby) mode Reduced switching loss and standby power due to re(0.60) 1.27 0.40 duced frequency 0.10 Seating plane • Input voltage correction function. This function corrects SOP008-P-0225C the maximum on-period in a manner inversely proportional to the input voltage. • Built-in overvoltage protection function (detects at VCC pin) • Pulse-by-pulse overcurrent protection function (single detection per one cycle) • Packages: 8-pin DIP ··· AN8038 8-pin SOP ··· AN8038S 4.30±0.20 6.40±0.20 0.15±0.10 +0.10 –0.05 Unit: mm (1.05) 0° to10° 0.50±0.20 s Applications • Facsimiles and other OA equipment • Printers and other personal computer peripheral equipment • AV equipment 1.45±0.10 1.75 max. 2.54 6 1.2±0.25 1 AN8038, AN8038S s Block Diagram Voltage Regulators OVP OVP R S (SD latch) Q INIT 8 VCC Start Stop VREF 7V 7V Current reviser (IFB) 2 17.5 kΩ 17.5 kΩ VFB TON 4.2 V High-side clamp TR 1 Low-side clamp Current reviser (ITR) RQ S (TR latch) 0.25 V CF 3 Q Q Q Q Q CF latch In In 7 6 Out GND RSTB Out drive IFB 4 I/V conv. Q S R R − 0.2 V 5 CLM TOFF 1.0 V 2 Voltage Regulators s Pin Descriptions Pin No. Symbol 1 TR Description AN8038, AN8038S 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. 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. Connection for the capacitor that determines the on and off periods for the IC output (Out). Input for the current feedback signal from the power supply output photocoupler Input of the pulse-by-pulse overcurrent protection circuit. Normally, it will be necessary to add an external filter for this input. Ground Output to drive a power MOSFET directly Power supply. This pin watches VCC , and has operating threshold voltages for the start, stop, OVP, and OVP reset levels. 2 RSTB 3 4 5 6 7 8 CF IFB CLM GND VOUT VCC s Absolute Maximum Ratings Parameter Supply voltage Peak output current Power dissipation (Independent IC without a heat sink) AN8038S AN8038 Symbol VCC IOP PD (Ta = 25°C) PD (Ta = 85°C) PD (Ta = 25°C) PD (Ta = 85°C) Operating temperature Storage temperature Topr Tstg Rating 28 −1, +2 500 260 306 *1 122 *2 −30 to +85 −55 to +150 °C °C Unit V A mW Note) *1: When mounted on a printed circuit board: 477 mW *2: When mounted on a printed circuit board: 191 mW s Recommended Operating Range Parameter Supply voltage Symbol VCC Range From the stop voltage to the OVP operating voltage Unit V 3 AN8038, AN8038S s Electrical Characteristics at VCC = 18 V, Ta = 25°C Parameter Low voltage protection (U.V.L.O.) initial startup supply voltage. Low voltage protection (U.V.L.O.) operation stop supply voltage Overvoltage protection (OVP) operating supply voltage Overvoltage protection (OVP) release supply voltage Overvoltage protection (OVP) operating time circuit current 1 Overvoltage protection (OVP) operating time circuit current 2 Transformer reset detection (TR) threshold voltage Transformer reset detection (TR) upper limit clamp voltage Transformer reset detection (TR) lower limit clamp voltage Transformer reset detection (TR) pin source current Overcurrent protection (CLM) threshold voltage Oscillator (CF) maximum on-period current gain Oscillator (CF) maximum on-period current Oscillator (CF) minimum off-period current 1 Oscillator.


AN8037 AN8038 AN8038S


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