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HA17432HUP Datasheet(PDF) 7 Page - Hitachi Semiconductor |
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HA17432HUP Datasheet(HTML) 7 Page - Hitachi Semiconductor |
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7 / 15 page  HA17431H Series Rev.0, Sep. 2001, page 7 of 15 Application Hints (cont.) No. Application Example Description 3 Single power supply inverting comparator circuit K Vout GND Vin GND A REF VCC RL Rin This is an inverting type comparator with an input threshold voltage of approximately 2.5 V. Rin is the REF pin protection resistance, with a value of several k Ω to several tens of kΩ. R L is the load resistance, selected so that the cathode current I K ≥ 0.2 mA when Vout is low. Condition C1 C2 Vin Less then 2.5 V 2.5 V or more Vout VCC (VOH) Approx. 2 V (VOL) IC OFF ON 4 AC amplifier circuit GND K Vout Vin REF A VCC RL R1 R2 R3 Cin Cf Gain G = (DC gain) R1 R2 // R3 Cutoff frequency fc = 1 2 π Cf (R 1 // R2 // R3) This is an AC amplifier with voltage gain G = –R 1 / (R 2//R3). The input is cut by capacitance Cin, so that the REF pin is driven by the AC input signal, centered on 2.5 V DC. R 2 also functions as a resistance that determines the DC cathode potential when there is no input, but if the input level is low and there is no risk of Vout clipping to V CC, this can be omitted. To change the frequency characteristic, Cf should be connected as indicated by the dotted line. 5 Switching power supply error amplification circuit + – V + V – R1 R2 R3 R4 LED Cf Secondary side GND (Note) Note: LED R3 R4 : Light emitting diode in photocoupler : Bypass resistor to feed IK(>Imin) when LED current vanishes : LED protection resistance This circuit performs control on the secondary side of a transformer, and is often used with a switching power supply that employs a photocoupler for offlining. The output voltage (between V+ and V–) is given by the following formula: Vout ≅ 2.5 V × (R1 + R2) R2 In this circuit, the gain with respect to the Vout error is as follows: G = × R2 (R1 + R2) HA17431H open loop gain × photocoupler total gain As stated earlier, the HA17431H open-loop gain is 50 to 60 dB. |
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