參數(shù)資料
型號(hào)： TPS2552DRVR-1
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6
封裝： GREEN, PLASTIC, SON-6
文件頁(yè)數(shù)： 3/32頁(yè)
文件大?。?/td> 1025K
代理商： TPS2552DRVR-1
SLVS841D
– NOVEMBER 2008 – REVISED JUNE 2011
DETAILED DESCRIPTION
OVERVIEW
The TPS2552/53 and TPS2552-1/53-1 are current-limited, power-distribution switches using N-channel
MOSFETs for applications where short circuits or heavy capacitive loads will be encountered and provide up to
1.5 A of continuous load current. These devices allow the user to program the current-limit threshold between 75
mA and 1.7 A (typ) via an external resistor. Additional device shutdown features include overtemperature
protection and reverse-voltage protection. The device incorporates an internal charge pump and gate drive
circuitry necessary to drive the N-channel MOSFET. The charge pump supplies power to the driver circuit and
provides the necessary voltage to pull the gate of the MOSFET above the source. The charge pump operates
from input voltages as low as 2.5 V and requires little supply current. The driver controls the gate voltage of the
power switch. The driver incorporates circuitry that controls the rise and fall times of the output voltage to limit
large current and voltage surges and provides built-in soft-start functionality. There are two device families that
handle overcurrent situations differently. The TPS2552/53 family enters constant-current mode while the
TPS2552-1/53-1 family latches off when the load exceeds the current-limit threshold.
OVERCURRENT CONDITIONS
The TPS2552/53 and TPS2552-1/53-1 respond to overcurrent conditions by limiting their output current to the IOS
levels shown in Figure 24. When an overcurrent condition is detected, the device maintains a constant output
current and reduces the output voltage accordingly. Two possible overload conditions can occur.
The first condition is when a short circuit or partial short circuit is present when the device is powered-up or
enabled. The output voltage is held near zero potential with respect to ground and the TPS2552/53 ramps the
output current to IOS. The TPS2552/53 devices will limit the current to IOS until the overload condition is removed
or the device begins to thermal cycle. The TPS2552-1/53-1 devices will limit the current to IOS until the overload
condition is removed or the internal deglitch time (7.5-ms typical) is reached and the device is turned off . The
device will remain off until power is cycled or the device enable is toggled.
The second condition is when a short circuit, partial short circuit, or transient overload occurs while the device is
enabled and powered on. The device responds to the overcurrent condition within time tIOS (see Figure 3). The
current-sense amplifier is overdriven during this time and momentarily disables the internal current-limit
MOSFET. The current-sense amplifier recovers and limits the output current to IOS. Similar to the previous case,
the TPS2552/53 will limit the current to IOS until the overload condition is removed or the device begins to thermal
cycle; the TPS2552-1/53-1 will limit the current to IOS until the overload condition is removed or the internal
deglitch time is reached and the device is latched off.
The TPS2552/53 thermal cycles if an overload condition is present long enough to activate thermal limiting in any
of the above cases. The device turns off when the junction temperature exceeds 135
°C (typ) while in current
limit. The device remains off until the junction temperature cools 10
°C (typ) and then restarts. The TPS2552/53
cycles on/off until the overload is removed (see Figure 10 and Figure 12) .
REVERSE-VOLTAGE PROTECTION
The reverse-voltage protection feature turns off the N-channel MOSFET whenever the output voltage exceeds
the input voltage by 135 mV (typ) for 4-ms (typ). A reverse current of (VOUT – VIN)/rDS(on)) will be present when
this occurs. This prevents damage to devices on the input side of the TPS2552/53 and TPS2552-1/TPS2253-1
by preventing significant current from sinking into the input capacitance. The TPS2552/53 devices allow the
N-channel MOSFET to turn on once the output voltage goes below the input voltage for the same 4-ms deglitch
time. The TPS2552-1/53-1 devices keep the device turned off even if the reverse-voltage condition is removed
and do not allow the N-channel MOSFET to turn on until power is cycled or the device enable is toggled. The
reverse-voltage comparator also asserts the FAULT output (active-low) after 4-ms.
Copyright
2008–2011, Texas Instruments Incorporated
11
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