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參數(shù)資料
| 型號： | TPS2301PWR |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 411K |
| 代理商： | TPS2301PWR |
TPS2330, TPS2331
SINGLE HOT SWAP POWER CONTROLLER WITH
CIRCUIT BREAKER AND POWER-GOOD REPORTING
SLVS277A – MARCH 2000– REVISED APRIL 2000
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
setting the power-good threshold voltage
The two feedback resistors R
VSENSE_TOP
and R
VSENSE_BOT
connected between V
O
and ground form a
resistor divider setting the voltage at the VSENSE pins. VSENSE voltage equals to
V
I(SENSE)
= V
O
×
R
VSENSE_BOT
/(R
VSENSE_TOP
+ R
VSENSE_BOT
)
This voltage is compared to an internal voltage reference (1.225 V
±
2%) to determine whether the output voltage
level is within a specified tolerance. For example, given a nominal output voltage at V
O
, and defining V
O_min
as the minimum required output voltage, then the feedback resistors are defined by:
R
VSENSE_TOP
V
O_min
1.225
1.225
R
VSENSE_BOT
Start the process by selecting a large standard resistor value for R
VSENSE_BOT
to reduce power loss. Then
R
VSENSE_TOP
can be calculated by inserting all of the known values into the equation above. When V
O
is lower
than V
O_min
, PWRGD will be low as long as the controller is enabled.
undervoltage lockout (UVLO)
The TPS2330/TPS2331 includes an undervoltage lockout (UVLO) feature that monitors the voltage present on
the VREG pin. This feature will disable the external MOSFET if the voltage on VREG drops below 2.78 V
(nominal) and will re-enable normal operation when it rises above 2.85 V (nominal). Since VREG is fed from
IN through a low-dropout voltage regulator, the voltage on VREG will track the voltage on IN within 50 mV. While
the undervoltage lockout is engaged, GATE is held low by an internal PMOS pulldown transistor, ensuring that
the external MOSFET transistor remain off at the times, even if the power supply has fallen to 0 V.
power-up control
The TPS2330/TPS2331 includes a 500
μ
s (nominal) startup delay that ensures that internal circuitry has
sufficient time to start before the device begins turning on the external MOSFETs. This delay is triggered only
upon the rapid application of power to the circuit. If the power supply ramps up slowly, the undervoltage lockout
circuitry will provide adequate protection against undervoltage operation.
3-channel hot-swap application
Some applications require hot-swap control of up to three voltage rails, but may not explicitly require the sensing
of the status of the output power on all three of the voltage rails. One such application is device bay, where dv/dt
control of 3.3 V, 5 V, and 12 V is required. By using TPS2330/TPS2331 to drive all three power rails, as is shown
below, TPS2330/31 can deliver three different voltages to three loads while monitoring the status of one of the
loads.
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