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SR086 Datasheet(PDF) 5 Page - Supertex, Inc |
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SR086 Datasheet(HTML) 5 Page - Supertex, Inc |
5 / 7 page 5 NR040306 SR086/SR087 Data Sheet Application Section: Typical Application Circuit Output Voltage* V OUT may be adjusted in the range of 9V to 50V*‚ by changing feedback resistor R 5 according to the following equation. Leave R 6 at 12.4kΩ or less - it assures a minimum 100µA load required for the proper operation of the SR087. Change R 3 and R4 according to the R3+R4 equation below. Select C 2 and C3 with appropriate voltage ratings. For C3, use a low ESR capacitor with an adequate ripple current rating (800mA RMS). Use ceramic for C2. Since V REG is a linear regulator supplied from VOUT, the maxi- mum current available from V REG is reduced as VOUT is in- creased due to power considerations. or 60mA, whichever is less. Input Voltage To reduce standby power for 230VAC-only applications, or for supply voltages less than 90Vrms, R 3 and R4 should be changed according to the R 3+R4 equation below. R1+R2 should remain at 400kΩ or less. Two resistors in series are employed to ensure adequate creepage distances for 230VAC operation. For 120VAC-only applications, single re- sistors may be employed. Output Ripple* Storage capacitor C 3 was sized to provide about 2VP-P ripple at 100mA load (I OUT + IREG). For lighter loads, C3 may be re- duced. Conversely, C 3 may be increased for lower ripple. Use a low ESR capacitor with an adequate ripple current rating (800mA RMS for 100mA loads). Efficiency and output current capability may drop with increased capacitance be- cause of a smaller conduction angle associated with lower ripple. Due to feedback hysteresis, ripple cannot be reduced below 4%. *V REG requires at least 4V of headroom. Therefore, VOUT, including ripple, must not fall below 9V for the SR087, or below 7.3V for the SR086. RR V OUT 56 125 1 =− ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ .V I V REG(max) OUT = − 15 5 . W V V II fC RIPPLEP P OUT REG IN () − ≈ + 2 3 R 3 + R4 Equation: RR V X V V X IN 34 1 2 25 + () < () ⋅ − cos π μA 2VIN2 - VX2 - where V X = VOUT + 15V Use the minimum anticipated RMS value for V IN. Take resistor tolerance into account, selecting the next lower standard value. Choosing a lower value has no effect other than higher standby power. VGD VIN GATE VOUT GND FB VREG 5VDC VREG VOUT 12.6VDC VIN 90VAC to 270VAC 50/60Hz EN *R 3 510k *R 1 200k C 1 100nF C 2 1.0µF C 3 470µF R 5 113kΩ R 6 12.4kΩ R 7 100k D 1 1.0kV 1A Z 1 275V 50A F 1 1.00A EN Q 1 STGD5NB120SZ *R 2 200k *R 4 510k 1 2 4 3 5 6 7 8 C 4 100nF IC1 SR087 * Two resistors used in series for reasons of high voltage creepage and resistor voltage rating. |
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