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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： | 16/18页 |
| 文件大小： | 1021K |
| 代理商： | TPS2590RSA |
6
SD
CT
t
1.0 10
C
=
RFLT
FAULT
200k
R
I
W
=
LIM
201k
R
I
W
=
OUT
IN
OUT
V
0.04 I
=
-
www.ti.com
SLUS960B – JULY 2009 – REVISED AUGUST 2010
(2)
The nominal ratio of on-to-off times represents about a 3% duty cycle when a hard fault is present on the output
of an autoretry version part.
FLT: Open-drain output that pulls low on any condition that causes the output to open. These conditions are
either an overload with a fault time-out, or a thermal shutdown. FLT becomes operational before UV, when VIN is
greater than 1 V.
GND: This is the most negative voltage in the circuit and is used as reference for all voltage measurements
unless otherwise specified.
IFLT: A resistor connected from this pin to ground sets the fault current threshold (IFAULT). Currents between the
fault current threshold and the current limit are permitted to flow unimpeded for the period set by the fault timer
programmed on CT. This permits loads to draw momentary surges while maintaining the protection provided by a
lower average-current limit.
The fault timer implemented by CT starts charging CT when current through VIN exceeds IFAULT. If the current
doesn’t drop below the IFAULT level before VCT reaches its upper threshold, the output will be shut off. The fault
current resistor is set by the following formula where IFAULT is in Amperes and RRFLT is in Ohms.
(3)
ILIM: A resistor connected from this pin to ground sets ILIM. The TPS2590 will limit current to ILIM. If the current
doesn’t drop below the IFAULT level before the timer times out then the output will be shut off. RLIM is set by the
formula:
(4)
ILIM must be set sufficiently larger than IFAULT to ensure that lLIM could never be less than IFAULT, even after taking
tolerances into account.
EN: When this pin is pulled low, the IC is enabled. The input threshold is hysteretic, allowing the user to program
a startup delay with an external RC circuit. EN is pulled to VIN by a 10-M
resistor, pulled to GND by 16.8 M
and is clamped to ground by a 7-V Zener diode. Because high impedance pullup/down resistors are used to
reduce current draw, any external FET controlling this pin should be low leakage.
IN: Input voltage to the TPS2590. The recommended operating voltage range is 3 V to 18 V. All VIN pins should
be connected together and to the power source.
OUT: Output connection for the TPS2590. When switched on the output voltage will be approximately:
(5)
All OUT pins should be connected together and to the load.
RTRY: When pulled low the TPS2590 will attempt to restart after a fault. If left floating or pulled high the
TPS2590 will latch off after a fault. This pin is internally clamped at 3 V and is pulled to the internal 3-V supply by
a diode in series with a 100-k
resistor.
Copyright 2009–2010, Texas Instruments Incorporated
7
Product Folder Link(s): TPS2590
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