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参数资料
| 型号： | TPS65148RHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 13/30页 |
| 文件大小： | 947K |
| 代理商： | TPS65148RHBR |
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W
-
÷
è
IN_LIM
DET
V
R5 =
18 k
R4 = R5
1
70 A
V
DET
R4
R5
V
IN
V
DET
V
DET_threshold
V
+hys
DET_threshold
Min.Operating
voltage
V =1.6V
IN
XAO
GND
Unknown
state
m
X
XAO_min
XAO_max
V
V - 2 V
R
>
&
R
<
1 mA
2
A
SLVS904A – MAY 2009 – REVISED JANUARY 2011
www.ti.com
RESET FUNCTION
The device has an integrated reset function with an open-drain output capable of sinking 1 mA. The reset
function monitors the voltage applied to its sense input VDET. As soon as the voltage on VDET falls below the
threshold voltage VDET_threshold of typically 1.240 V, the reset function asserts its reset signal by pulling XAO low.
Typically, a minimum current of 50mA flowing through the feedback divider when VDET voltage trips the
reference voltage of 1.240 V is required to cover the noise fluctuation. Therefore, to select R4, one has to set the
input voltage limit (VIN_LIM) at which the reset function will pull XAO to low state. VIN_LIM must be higher than the
UVLO threshold. The resistors are then calculated with 70 A as:
with VDET = 1.240 V
(12)
The reset function is operational for VIN ≥ 1.6V:
Figure 25. Voltage Detection and XAO Pin
The reset function is configured as a standard open-drain output and requires a pull-up resistor. The resistor R
XAO , which must be connected between the XAO pin and a positive voltage VX greater than 2V - 'high' logic level
- e.g. VIN, can be chosen as follows:
(13)
THERMAL SHUTDOWN
A thermal shutdown is implemented to prevent damages because of excessive heat and power dissipation.
Typically the thermal shutdown threshold for the junction temperature is 150 °C. When the thermal shutdown is
triggered the device stops operating until the junction temperature falls below typically 136 °C. Then the device
starts switching again. The XAO signal is independent of the thermal shutdown.
20
Copyright 2009–2011, Texas Instruments Incorporated
Product Folder Link(s) :TPS65148
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