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参数资料
| 型号： | TPS2590RSA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封装： | 4 X 4 MM, PLASTIC, QFN-16 |
| 文件页数： | 15/18页 |
| 文件大小： | 1021K |
| 代理商： | TPS2590RSA |
4
2
3
8
12
11
10
9
15
14
13
1
5
6
7
TPS2590
16
G
N
D
CT
IF
L
T
IL
IM
VIN
E
N
VOUT
VIN
VOUT
F
L
T
G
N
D
G
N
D
R
T
R
Y
FAULT
CT
3
T
C
38.9 10
=
SLUS960B – JULY 2009 – REVISED AUGUST 2010
www.ti.com
TPS2590 PINOUT
TERMINAL FUNCTIONS
FUNCTION
TPS2590
DESCRIPTION
EN
16
Device is enabled when this pin is pulled low.
IN
1-4
Power In and control supply voltage.
6
If low, the TPS2590 will attempt to restart after an overcurrent fault. If floating (high) the device will
RTRY
latch off after an overcurrent fault and will not attempt to restart until EN or Vin is cycled off and on.
ILIM
7
A resistor to ground sets the current limit level.
IFLT
8
A resistor to ground sets the fault current level.
CT
9
A capacitor to ground sets the fault time.
GND
5, 13, 14
GND
OUT
10, 11, 12
Output to the load.
FLT
15
Fault low indicated the fault time has expired and the FET is switched off.
PIN DESCRIPTION
CT: Connect a capacitor form CT to GND to set the fault time. The fault timer starts when the fault current
threshold is exceeded, charging the capacitor with 36 mA from GND towards an upper threshold of 1.4 V. If the
capacitor reaches the upper threshold, the internal pass MOSFET is turned off. The MOSFET will stay off until
EN is cycled if a latching version is used. If an auto-retry version is used, the capacitor will discharge at 5 mA to
0.2 V and then re-enable the pass MOSFET. When the device is disabled, CT is pulled to GND through a
100-k
resistor.
The timer period must be chosen long enough to allow the external load capacitance to charge. The fault timer
period is selected using the following formula where TFAULT is the minimum timer period in seconds and CCT is in
Farads.
(1)
This equation does not account for component tolerances. In autoretry versions, the second and subsequent
retry timer periods will be approximately 85 % as long as the first retry period.
In autoretry versions, the fault timer discharges the capacitor for a nominal tSD in seconds with CCT in Farads per
the following equation.
6
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS2590
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