參數(shù)資料
型號(hào)： NCP1523
廠商： Texas Instruments, Inc.
英文描述： 6-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans
中文描述： 6甲，2.2 V至5.5 V輸入，非隔離，寬輸出，可調(diào)電源模塊的TurboTrans
文件頁(yè)數(shù)： 22/35頁(yè)
文件大?。?/td> 1128K
代理商： NCP1523
www.ti.com
UNDERVOLTAGE LOCKOUT (UVLO)
The PTH04T230/231W 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 power-up for the load circuit, and also limits the magnitude of
current drawn from the regulator’s input source during the power-up sequence.
R
UVLO
68.54
V
THD
V
THD
2.07
k
(5)
GND
2
3
+
GND
Inhibit/
UVLO
10
V
I
V
I
C
I
UDG06059
PTH04T230/231W
R
UVLO
PTH04T230W, PTH04T231W
SLTS271A–SEPTEMBER 2006–REVISED OCTOBER 2006
The UVLO characteristic is defined by the ON threshold (V
THD
) voltage. Below the
ON
threshold, the Inhibit
control is overridden, and the module does not produce an output. The hysteresis voltage, which is the
difference between the
ON
and
OFF
threshold voltages, is set at 500 mV. The hysteresis 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 PTH04T230/231W module allows for limited adjustment of the
ON
threshold voltage.
The adjustment is made via the
Inhbit/UVLO Prog
control pin (pin 10) using a single resistor (see figure below).
When pin 10 is left open circuit, the
ON
threshold voltage is internally set to its default value, which is 1.95 volts.
The
ON
threshold might need to be raised if the module is powered from a tightly regulated 5-V bus. Adjusting
the threshold prevents the module from operating if the input bus fails to completely rise to its specified
regulation voltage.
Equation 5
determines the value of R
required to adjust V
THD
to a new value. The default value is 1.95 V,
and it may only be adjusted to a higher value.
Table 7
lists the standard resistor values for R
UVLO
for different values of the ON-threshold (V
THD
) voltage.
Table 7. Standard R
UVLO
Values for Various V
THD
Values
V
THD
(V)
R
UVLO
(k
)
2.5
154
3.0
71.5
3.5
53.6
4.0
33.2
4.5
26.7
Figure 18. Undervoltage Lockout
22
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