LT4250L Linear Technology Corporation, LT4250L Datasheet
LT4250L
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LT4250L Summary of contents
Page 1
... After a 500 s timeout the current limit activates the electronic circuit breaker. The PWRGD (LT4250L) or PWRGD (LT4250H) signal can be used to directly enable a power module. The LT4250L is designed for modules with a low enable input and the LT4250H for modules with a high enable input. ...
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... OVH V OV Pin Low Threshold Voltage OVL 2 U RATINGS (Note 1), All Voltages Referred to V Operating Temperature Range LT4250LC/LT4250HC ............................. LT4250LI/LT4250HI .......................... – Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 ORDER PART NUMBER LT4250LCN8 PWRGD 1 ...
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... Figures 1a, 2 Figures 1a, 3 Figures 1a, 4a Figures 1b, 4b (LT4250L) Figures 1a, 5a (LT4250L) Figures 1a, 5b (LT4250H) Figures 1a, 5b Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to V specified. Supply Current vs Temperature 1 ...
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... V is within GATE GH connected directly to the enable pin of a power module. When the DRAIN pin of the LT4250L is above V than more than V DL GATE PWRGD pin will be high impedance, allowing the pull-up current of the module’s enable pin to pull the pin high and turn the module off ...
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... GATE DELAY DRIVER + + + – GATE V SENSE EE LT4250L/LT4250H and SENSE can be shorted EE – < 50mV and the V SENSE EE . The GATE pin is pulled high by a UVLOH , the PWRGD/PWRGD pin will latch to indicate pin is greater than DD threshold. UVLOH OUTPUT PWRGD/PWRGD DRIVE – ...
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... PHLDL PWRGD 1V V 4250 F05a PWRGD Figure 5b. GATE to PWRGD/PWRGD Timing + 20V – PWRGD/PWRGD 48V – OV DRAIN LT4250L/LT4250H 10k 10 UV GATE 0 SENSE EE Figure 1b. Test Circuit 2 1.125V 1.255V t PHLUV 1V Figure GATE Timing t PHLCB 1V 1V Figure 4b. Active Current Limit Timeout 1.4V – ...
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... F GATE –V 100V + C5 1 PWRGD GATE IN 100 F 16V – – OUT DRAIN 7 C2 4250 F06a LT4250L/LT4250H is the total load capacitance = module • C2/C EE GS(Q1 INMAX 72V INMAX is the MOSFET’s minimum gate threshold and MODULE INRUSH ...
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... LT4250L/LT4250H U U APPLICATIONS INFORMATION Current Limit/Electronic Circuit Breaker The LT4250 features a current limit function that protects against short circuits or excessive supply currents. If the current limit is active for more than 500 s the electronic circuit breaker will trip. By placing a sense resistor between the V ...
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... 220 3.3nF 5% 10 BAT85 100V 0. 150nF 5% 25V IRF530 LT4250L PWRGD + C3 100 F 100V GATE DRAIN 1k 470nF 5% 15nF 25V 100V Q1 4250 F10a IRF530 . Diode EE . The duty EE C3 0.1 F 100V ...
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... DRAIN and turning Q2 off. The pull-up current in the module pulls the PWRGD pin high and enables the module. When the DRAIN voltage of the LT4250L is high with respect to V down transistor Q2 is off and the PWRGD pin high impedance state (Figure 13). The PWRGD pin will be pulled high by the module’ ...
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... LTC DWG # 05-08-1610) 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0 – 8 TYP 0.014 – 0.019 0.050 (1.270) (0.355 – 0.483) BSC TYP LT4250L/LT4250H LT4250L PWRGD SENSE GATE DRAIN 1k ...
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... A typical application –48V RTN (SHORT PIN) –48V RTN PWRGD 549k DRAIN R5 LT4250L 15nF 6.49k 2 6 100V 1% OV GATE R6 V SENSE EE 10k 470nF ...