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HA17432HLTP Datasheet(PDF) 8 Page - Hitachi Semiconductor |
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HA17432HLTP Datasheet(HTML) 8 Page - Hitachi Semiconductor |
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8 / 15 page  HA17431H Series Rev.0, Sep. 2001, page 8 of 15 Application Hints (cont.) No. Application Example Description 6 Constant voltage regulator circuit VCC R1 R2 R3 Cf Q Vout GND GND This is a 3-pin regulator with a discrete configuration, in which the output voltage Vout = 2.5 V × (R2 + R3) R3 R 1 is a bias resistance for supplying the HA17431H cathode current and the output transistor Q base current. 7 Discharge type constant current circuit GND VCC R RS Q 2.5 V + – IL This circuit supplies a constant current of IL ≅ [A] into the load. Caution is required 2.5 V RS since the HA17431H cathode current is also superimposed on I L. The requirement in this circuit is that the cathode current must be greater than Imin = 0.2 mA. The I L setting therefore must be on the order of several mA or more. 8 Induction type constant current circuit GND VCC R Q 2.5 V + – IL RS In this circuit, the load is connected on the collector side of transistor Q in circuit 7 above. In this case, the load floats from GND, but the HA17431H cathode current is not superimposed on I L, so that IL can be kept small (0.2 mA or less is possible). The constant current value is the same as for circuit 7 above: IL ≅ [A] 2.5 V RS |
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Similar Description - HA17432HLTP |
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