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參數(shù)資料
| 型號(hào)： | 94SA108X0016HBP |
| 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(diào)節(jié)電源模塊 |
| 文件頁數(shù)： | 4/24頁 |
| 文件大小： | 947K |
| 代理商： | 94SA108X0016HBP |
www.ti.com
NOTES:
ADJUSTING THE UNDERVOLTAGE LOCKOUT (UVLO) OF THE PTH04040W POWER MODULES
PTH04040W
SLTS238A – SEPTEMBER 2005 – REVISED FEBRUARY 2006
Table 3. Output Voltage Set-Point Resistor Values
VOUT
RSET
VOUT
RSET
0.8
Open
1.425
10.3 k
0.825
318 k
1.45
9.82 k
0.85
158 k
1.475
9.36 k
0.875
104 k
1.5
8.94 k
0.9
77.5 k
1.55
8.18 k
0.925
61.5 k
1.6
7.51 k
0.95
50.8 k
1.65
6.92 k
0.975
43.2 k
1.7
6.4 k
1
37.5 k
1.75
5.93 k
1.025
33.1 k
1.8
5.51 k
1.05
29.5 k
1.85
5.13 k
1.075
26.6 k
1.9
4.78 k
1.1
24.2 k
1.95
4.47 k
1.125
22.1 k
2
4.18 k
1.15
20.4 k
2.05
3.91k
1.175
18.8 k
2.1
3.66 k
1.2
17.5 k
2.15
3.44 k
1.225
16.3 k
2.2
3.22 k
1.25
15.3 k
2.25
3.03 k
1.275
14.4 k
2.3
2.84 k
1.3
13.5 k
2.35
2.67 k
1.325
12.7 k
2.4
2.51 k
1.35
12.1 k
2.45
2.36 k
1.375
11.4 k
2.5
2.22 k
1.4
10.8 k
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 VO Adjust to either GND or VO. Any capacitance added to the VAdjust pin
affects the stability of the regulator.
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.
The UVLO characteristic is defined by the on-threshold (VTHD) and hysterisis (VHYS) 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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