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參數(shù)資料
| 型號： | UPM1A102MHH6 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 60-A, 3.3/5-V INPUT, NONISOLATED WIDE-OUTPUT ADJUST POWER MODULE |
| 中文描述： | 60甲，3.3/5-V輸入，非隔離寬輸出調節(jié)電源模塊 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大小： | 947K |
| 代理商： | UPM1A102MHH6 |
www.ti.com
NOTES:
1. A 0.05-W rated resistor can be used. The tolerance should be 1%, with temperature stability of 100 ppm/
°
C
(or better). Place the resistor as close to the regulator as possible. Connect the resistor directly between pins
17 and 16 using dedicated PCB traces.
2. Never connect capacitors from
V
Adjust
to either
GND or V
O
. Any capacitance added to the
V
O
Adjust
pin
affects the stability of the regulator.
ADJUSTING THE UNDERVOLTAGE LOCKOUT (UVLO) OF THE PTH04040W POWER MODULES
The PTH04040W 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 monotonic powerup for the load circuit, and also limits the magnitude of current drawn
from the module’s input source during the power-up sequence.
PTH04040W
SLTS238A–SEPTEMBER 2005–REVISED FEBRUARY 2006
Table 3. Output Voltage Set-Point Resistor Values
V
OUT
0.8
0.825
0.85
0.875
0.9
0.925
0.95
0.975
1
1.025
1.05
1.075
1.1
1.125
1.15
1.175
1.2
1.225
1.25
1.275
1.3
1.325
1.35
1.375
1.4
R
SET
Open
318 k
158 k
104 k
77.5 k
61.5 k
50.8 k
43.2 k
37.5 k
33.1 k
29.5 k
26.6 k
24.2 k
22.1 k
20.4 k
18.8 k
17.5 k
16.3 k
15.3 k
14.4 k
13.5 k
12.7 k
12.1 k
11.4 k
10.8 k
V
OUT
1.425
1.45
1.475
1.5
1.55
1.6
1.65
1.7
1.75
1.8
1.85
1.9
1.95
2
2.05
2.1
2.15
2.2
2.25
2.3
2.35
2.4
2.45
2.5
R
SET
10.3 k
9.82 k
9.36 k
8.94 k
8.18 k
7.51 k
6.92 k
6.4 k
5.93 k
5.51 k
5.13 k
4.78 k
4.47 k
4.18 k
3.91k
3.66 k
3.44 k
3.22 k
3.03 k
2.84 k
2.67 k
2.51 k
2.36 k
2.22 k
The UVLO characteristic is defined by the on-threshold (V
THD
) and hysterisis (V
HYS
) voltages. Below the
on
threshold, the
Inhibit
control is overriden, and the module does not produce an output. Hysterisis voltage is the
difference between the
on
and
off
threshold voltages. It ensures a clean power-up, even when the input voltage
is rising slowly. 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.
12
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