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HV311 Datasheet(PDF) 10 Page - Supertex, Inc |
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HV311 Datasheet(HTML) 10 Page - Supertex, Inc |
10 / 21 page 10 HV301/HV311 Application Circuit 1 PWRGD Output It is critical to have a detailed understanding of the ENABLE input circuitry of the load (DC/DC PWM Converter) in order to make the correct choice between the HV301 or HV311. Many DC/DC PWM Converters reference their ENABLE inputs to the negative input terminal. If the ENABLE input is active LOW then the HV311 can be directly connected as shown below (Application Circuit 1) since the open drain PWRGD output is in a High-Z state until the external MOSFET is fully turned on and the potential on the negative input of the converter is essentially the same as the V EE pin of the HV311. VDD UV OV VEE SENSE GATE RAMP -48V R4 12.5m Ω R1 487k Ω R2 6.81k Ω R3 9.76k Ω Q1 IRF530 Cload +5V HV311 8 3 2 COM 1 GND C1 10nF + - DC/DC PWM CONVERTER PWRGD ENABLE 5 74 6 Note: capacitor may be needed to slow PWRGD dv/dt if oscillations are observed when V IN is close to OV. |
Similar Part No. - HV311 |
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Similar Description - HV311 |
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