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PQ1CY1032Z Datasheet(PDF) 6 Page - Sharp Corporation |
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PQ1CY1032Z Datasheet(HTML) 6 Page - Sharp Corporation |
6 / 9 page PQ1CY1032Z s Precautions for Use 1. External connection (1) Wiring condition is very important. Noise associated with wiring inductance may cause problems. For minimizing inductance, it is recommended to design the thick and short pattern (between large current diodos, input/output capacitors, and terminal 1,2.) Single-point grounding (as indicated) should be used for best results. (2) High switching speed and low forward voltage type schottky barrier diode should be recommended for the catch-diode D because it affects the efficiency. Please select the diode which the current rating is at least 1.2 times greater than maximum swiching current. (3) The output ripple voltage is highly influenced by ESR (Equivalent Series Resistor) of output capacitor, and can be minimized by selecting Low ESR capacitor. (4) An inductor should not be operated beyond its maximum rated current so that it may not saturate. (5) When voltage that is higher than VIN , is applied to VOUT , there is the case that the device is broken. Especially, in case VIN is shorted to GND in normal condition, there is the case that the device is broken since the charged electric charge in output capacitor (CO) flows into input side. In such case a schottly barrier diode or a silicon diode shall be recommended to connect as the following circuit. 4 2 5 3 1 R1 R2 VO Load L CO CS CIN VIN D PQ1CY1032Z + + 12 PQ1CY1032Z Fig.17 Polarity Inversion Type Circuit Diagram 1 2 L D 5 3 4 PQ1CY1032Z R1 R2 CO CIN VIN VO −5V + + 65 µH 2 200 µF 220 µF 5 to 30V 3k Ω 1k Ω ON/OFF control signal Load CS RS 1 2 1 |
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