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| 型号： | PTH05T210WAST |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | PLASTIC, DIP-14 |
| 文件页数： | 11/31页 |
| 文件大小： | 1135K |
| 代理商： | PTH05T210WAST |
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UNDERVOLTAGE LOCKOUT (UVLO)
UVLO Adjustment
R
UVLO +
101 * VTHD
V
THD * 1
kW
(5)
2
3
4
1
Inhibit/
UVLO Prog
GND
VI
RUVLO
CI
PTH05T210W
www.ti.com ...................................................................................................................................................... SLTS263I – AUGUST 2007 – REVISED MARCH 2009
The PTH05T210W power modules incorporate an input undervoltage lockout (UVLO). The UVLO feature
prevents the operation of the module until there is sufficient input voltage to produce a valid output voltage. This
enables the module to provide a clean, monotonic powerup for the load circuit, and also limits the magnitude of
current drawn from the regulator’s input source during the power-up sequence.
The UVLO characteristic is defined by the ON threshold (VTHD) voltage. Below the ON threshold, the Inhibit
control is overridden, and the module does not produce an output. The hysterisis voltage, which is the difference
between the ON and OFF threshold voltages, is nominally set at 150mV. The hysterisis prevents start-up
oscillations, which can occur if the input voltage droops slightly when the module begins drawing current from the
input source.
The UVLO feature of the PTH05T210W module allows for limited adjustment of the ON threshold voltage. The
adjustment is made via the Inhbit/UVLO Prog control pin (pin 1) using a single resistor (see figure below). When
pin 1 is left open circuit, the ON threshold voltage is internally set to its default value. The ON threshold has a
nominal voltage of 4.25 V, and a hysterisis of 150 mV. Adjusting the threshold voltage prevents the module from
operating if the input bus fails to completely rise to its specified regulation voltage.
Equation 5 determines the value of RTHD required to adjust VTHD to a new value. The default value is 4.25 V, and
it may only be adjusted to a higher value.
Table 7 lists the standard resistor values for RUVLO for different values of the ON-threshold (VTHD) voltage.
Table 7. Standard Values of RUVLO for Various Values of VTHD
VTHD
5.00 V
4.75 V
4.50 V
4.25 V
RUVLO
24.3 k
25.5 k
27.57 k
OPEN
Figure 11. UVLO Program Resistor Placement
Copyright 2007–2009, Texas Instruments Incorporated
19
Product Folder Link(s): PTH05T210W
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