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MAX5949A Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX5949A Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 18 page below the current limit, the circuit breaker does not trip. For C2 values less than 10nF, a positive voltage step on the input supply can result in Q1 turning off momentarily, which can shut down the output. By adding an additional resistor and diode, Q1 remains on during the voltage step. This is shown as D1 and R7 in Figure 10. The pur- pose of D1 is to shunt current around R7 when the power pins first make contact and allow C1 to hold the GATE low. The value of R7 should be sized to generate an R7 x C1 time constant of 33µs. Undervoltage and Overvoltage Protection The UV and OV pins can be used to detect undervoltage and overvoltage conditions. The UV and OV pins are internally connected to analog comparators with 130mV (UV) and 20mV (OV) of hysteresis. When the UV voltage falls below its threshold or the OV voltage rises above its threshold, the GATE pin is immediately pulled low. The GATE pin is held low until UV goes high and OV is low, indicating that the input supply voltage is within specifica- tion. The MAX5949_ includes an internal lockout (UVLO) that keeps the external MOSFET off until the input supply voltage exceeds 15.4V, regardless of the UV input. -48V Hot-Swap Controllers with External RSENSE ______________________________________________________________________________________ 11 GATE - VEE 10V/div ID (Q1) 5A/div DRAIN 50V/div 1ms/div Figure 8. Short-Circuit Protection Waveform DRAIN 20V/div ID (Q1) 5A/div VEE 20V/div 400 µs/div Figure 9. Voltage Step on Input Supply VEE SENSE GATE DRAIN VDD OV UV PWRGD MAX5949A -48V RTN -48V R4 549k Ω 1% R5 6.49k Ω 1% R6 10k Ω 1% R1 0.02 Ω 5% R3 1k Ω 5% R2 10 Ω 5% C1 150nF 25V Q1 IRF530 C2 3.3nF 100V * -48V RTN (SHORT PIN) R7 220 Ω 5% D1 BAT85 C4 22 µF 100V C3 0.1 µF 100V *DIODES INC. SMAT70A. Figure 10. Circuit for Input Steps with Small C1 |
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Similar Description - MAX5949A |
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