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MAX5900LCETT-T Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX5900LCETT-T Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 14 page Turn-On and Turn-Off Delays After power is applied, or ON/OFF is released, there is a 300ms delay (tON) before the gate ramp is started. This delay is also the automatic restart time delay. In the event of a circuit-breaker condition or an over- temperature fault condition, the turn-off delay is less than 2µs. An undervoltage condition must exist for at least 20ms (tOFF) before the MAX5900/MAX5901 turn off the external MOSFET. ON/OFF must be held low for at least 20ms (tOFF) before the MAX5900/MAX5901 turn off the external MOSFET. Turn-off delay minimizes spu- rious shutdowns due to noisy signals or momentary voltage spikes, as well as preventing accidental resetting of the circuit-breaker latch (MAX5900L/ MAX5901L). Thermal Shutdown A thermal shutdown feature helps protect the external MOSFET. If the die temperature of the MAX5900/ MAX5901 exceeds +125°C, the MOSFET is turned off. For accurate performance, the MAX5900/MAX5901 must be in close thermal contact with the external MOSFET (see the Layout Guidelines section). Due to the low power dissipation of the MAX5900/MAX5901, its junction temperature will typically be within a few degrees of the MOSFET. All versions of the MAX5900/ MAX5901 automatically restart from a temperature fault when the junction temperature drops below +110°C. Undervoltage Lockout The MAX5900/MAX5901 turn off the external MOSFET if the magnitude of the input voltage is below the level set by ON/OFF for longer than 20ms (tOFF). If ON/OFF is left unconnected, the lockout voltage (VUVLO) defaults to -31.5V. VUVLO may also be set to any value within the power-supply range by using external resistors. To set the lockout voltage to a value between -9V and -100V, use a resistor-divider connected between GND and VEE, with the center node of the divider connected to ON/OFF. For example, use a 3k Ω resistor (R1 in Figure 2) from ON/OFF to VEE and calculate the other resistor, R2, using: where VUVLO is the desired lockout voltage, and VON/OFF is the ON/OFF reference threshold specified in the Electrical Characteristics table (typically 1.26V). Figure 2 shows an example circuit with VUVLO set for -20V. To defeat the UVLO, simply connect a single 100k Ω resistor between ON/OFF and GND, as shown in Figure 4. RR VUVLO 21 126 1 =× − ⎛ ⎝⎜ ⎞ ⎠⎟ . -100V, SOT23/TDFN, Simple Swapper Hot-Swap Controllers _______________________________________________________________________________________ 7 HOT-SWAP CONTROLLER OPTIONAL -48V VEE GND R2 47k Ω R1 3k Ω MAX5900 GND ON/OFF ON/OFF MAX5901 DGND HOT-SWAP CONTROLLER #1 VEE GND C 2C MAX5900 GND ON/OFF HOT-SWAP CONTROLLER #2 VEE VEE GND ON/OFF MAX5901 MAX5900 MAX5901 Figure 2. Programmed -20V Lockout With Optional Optocoupler On/Off Control Figure 3. Power-Supply Sequencing Figure 4. Defeating Undervoltage Lockout HOT-SWAP CONTROLLER -48V VEE GND 100k Ω MAX5900 GND ON/OFF MAX5901 |
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