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LTC4216 Datasheet(PDF) 21 Page - Linear Technology |
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LTC4216 Datasheet(HTML) 21 Page - Linear Technology |
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21 / 24 page  LTC4216 4216f 21 ⎯R⎯E⎯S⎯E⎯T high when VOUT rises above 4.5V. Transient volt- age suppressor, Z1, and snubber network, RX and CX, connected at SENSEP pin are highly recommended to protect the 5V supply system from ringing and voltage spikes during a fault condition. The RC network, RY and CY, connected at the VCC pin, allows the LTC4216 bias supply to ride out supply glitches during a fault condition or adjacent board shorts. Auto-Retry after a Fault As shown in Figure 18, the LTC4216 can be configured to automatically retry after a fault condition by connecting both the ⎯F⎯A⎯U⎯L⎯T and ON pins together with an RC network. The network has a pull-up resistor, RAUTO, tied to the load supply (VIN) and an external capacitor, CAUTO, connected to ground. The auto-retry circuit will attempt to restart the LTC4216 after a circuit breaker trip, as shown in the timing diagram of Figure 19. In addition to the cooling cycle provided by the TIMER period during auto-retry sequence, the RC time constant for the ON pin voltage to reach 0.8V provides additional turn-off time to prevent the external MOSFET from overheating. The auto-retry duty cycle is given by: Duty Cycle tt tt t t SS FILTER OFF TIMER SS FILTER ≈ + ++ + •% 100 (20) where tTIMER = TIMER period as given by Equation (1); tOFF = time taken to charge the capacitor, CAUTO, from ⎯F⎯A⎯U⎯L⎯T VOL to VON(TH) threshold (0.8V). As there is an internal 5µA current source pull-up at the ⎯F⎯A⎯U⎯L⎯T pin, it SENSEP SENSEN GATE ON TIMER FB FAULT RESET SS 11 10 9 8 7 12 1 4 2 53 6 FILTER LTC4216 R1 5.62k 1% R5 39.2k 1% R7 10k R4 10k 1% R2 4.42k 1% R3 20k 1% R8 10k CY 330nF CX 100nF LONG BACKPLANE CONNECTOR (FEMALE) PCB EDGE CONNECTOR (MALE) GND LONG SHORT SHORT SHORT C1 10nF C2 4.7nF C3 33nF VOUT 3.3V 5A VIN 3.3V ON/RST ON/OFF GND M1 Si4864DY R6 10k + CLOAD 1000 µF LONG VCC 5V FAULT RESET µP LOGIC 4216 F16 VCC Z1 M2 M3 Z1: SMAJ6.0A M2, M3: 2N7002K PCB CONNECTION SENSING RSENSE 0.004 Ω RY 22 Ω RX 10 Ω Figure 16. PCB Connection Sensing with ON/OFF Control APPLICATIO S I FOR ATIO SENSEP SENSEN GATE ON FB FAULT RESET SS 11 10 9 8 7 12 1 4 2 53 6 FILTER LTC4216 R4 64.9k 1% R6 10k R3 10k 1% R1 20k 1% CY 330nF CZ 10nF CX 100nF R2 80.6k 1% LONG SHORT LONG BACKPLANE CONNECTOR (FEMALE) PCB EDGE CONNECTOR (MALE) GND C1 10nF C2 4.7nF C3 22nF VOUT 5V 5A VIN 5V GND M1 Si4864DY R5 10k + CLOAD 470 µF FAULT RESET µP LOGIC 4216 F17 VCC Z1: SMAJ6.0A TIMER Z1 RSENSE 0.004 Ω RZ 100 Ω RY 22 Ω RX 10 Ω Figure 17. 5V Hot Swap Application |
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