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UC3845BDR2G Datasheet(PDF) 14 Page - ON Semiconductor |
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UC3845BDR2G Datasheet(HTML) 14 Page - ON Semiconductor |
14 / 19 page ![]() UC3844B, UC3845B, UC2844B, UC2845B http://onsemi.com 14 Osc + - Reference Regulator + - 34V S R Q Internal Bias + 0.5mA Osc R R R 2R Error Amplifier 1.0V 7(12) 7(11) 6(10) 5(8) 3(5) R1 Vin = 15V 1(1) 2(3) 4(7) 8(14) 10k 1.0nF The capacitor's equivalent series resistance must limit the Drive Output current to 1.0 A. An additional series resistor may be required when using tantalum or other low ESR capacitors. The converter's output can provide excellent line and load regulation by connecting the R2/R1 resistor divider as shown. Figure 31. Step−Up Charge Pump Converter 5(9) PWM T Latch Current Sense Comparator 2.5V 3.6V VCC UVLO Vref UVLO UC3845B + 47 1N5819 15 10 1N5819 + 47 R2 Connect to Pin 2 for closed loop operation. R2 R1 ) 1 VO ≈ 2 (Vin) Output Load Regulation (Open Loop Configuration) IO (mA) VO (V) 0 2 9 18 36 29.9 28.8 28.3 27.4 24.4 + - + - S R + R R R 2R 5(9) PWM T Latch Current Sense Comparator + 47 15 10 1N5819 + 47 Reference Regulator 34V Q Internal Bias 0.5mA Error Amplifier 1.0V 7(12) 7(11) 6(10) 5(8) 3(5) Vin = 15V 1(1) 2(3) 4(7) 8(14) 10k 1.0nF The capacitor's equivalent series resistance must limit the Drive Output current to 1.0 A. An additional series resistor may be required when using tantalum or other low ESR capacitors. Figure 32. Voltage−Inverting Charge Pump Converter 2.5V 3.6V VCC UVLO Vref UVLO UC3845B VO ≈ -Vin Output Load Regulation IO (mA) VO (V) 0 2 9 18 32 −14.4 −13.2 −12.5 −11.7 −10.6 1N5819 + VO = 2.5 |
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