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參數(shù)資料
| 型號(hào)： | TPS20976D |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TV 41C 41#20 PIN WALL RECP |
| 中文描述： | 四配電開關(guān) |
| 文件頁數(shù)： | 5/19頁 |
| 文件大?。?/td> | 314K |
| 代理商： | TPS20976D |
TPS2090, TPS2091, TPS2092 DUAL,
TPS2095, TPS2096, TPS2097 QUAD
POWER-DISTRIBUTION SWITCHES
SLVS245A
–
SEPTEMBER 2000
–
REVISED MARCH 2001
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description
power switch
The power switch is an N-channel MOSFET with a maximum on-state resistance of 135 m
(V
I(IN)
= 5 V).
Configured as a high-side switch, the power switch prevents current flow from OUTx to IN and IN to OUTx when
disabled. The power switch supplies a minimum of 250 mA per switch.
charge pump
An internal 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 2.7 V and requires
very little supply current.
driver
The driver controls the gate voltage of the power switch. To limit large current surges and reduce the associated
electromagnetic interference (EMI) produced, the driver incorporates circuitry that controls the rise times and
fall times of the output voltage. The rise and fall times are typically in the 2-ms to 4-ms range.
enable (ENx or ENx)
The logic enable disables the power switch and the bias for the charge pump, driver, and other circuitry to reduce
the supply current to less than 10
μ
A when a logic high is present on ENx or a logic low is present on ENx. A
logic low input on ENx or logic high on ENx restores bias to the drive and control circuits and turns the power
on. The enable input is compatible with both TTL and CMOS logic levels.
overcurrent (OCx)
The OCx open drain output is asserted (active low) when an overcurrent or over temperature condition is
encountered. The output will remain asserted until the overcurrent or overtemperature condition is removed.
current sense
A sense FET monitors the current supplied to the load. The sense FET measures current more efficiently than
conventional resistance methods. When an overload or short circuit is encountered, the current-sense circuitry
sends a control signal to the driver. The driver in turn reduces the gate voltage and drives the power FET into
its saturation region, which switches the output into a constant current mode and holds the current constant
while varying the voltage on the load.
thermal sense
The TPS209x implements a dual thermal trip to allow fully independent operation of the power distribution
switches. In an overcurrent or short-circuit condition the junction temperature rises. When the die temperature
rises to approximately 140
°
C, the internal thermal sense circuitry checks to determine which power switch is
in an overcurrent condition and turns off that switch, thus isolating the fault without interrupting operation of the
adjacent power switch. Hysteresis is built into the thermal sense, and after the device has cooled approximately
20 degrees, the switch turns back on. The switch continues to cycle off and on until the fault is removed. The
(OCx) open-drain output is asserted (active low) when overtemperature or overcurrent occurs.
undervoltage lockout
A voltage sense circuit monitors the input voltage. When the input voltage is below approximately 2 V, a control
signal turns off the power switch.
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