參數(shù)資料
型號(hào)： UPC1935
廠商： NEC Corp.
元件分類： DC/DC變換器
英文描述： DC-DC CONVERTER CONTROL IC
中文描述： 的DC - DC轉(zhuǎn)換器控制IC
文件頁(yè)數(shù)： 15/28頁(yè)
文件大?。?/td> 185K
代理商： UPC1935
Data Sheet G13418EJ3V0DS00
15
μ
PC1935
(3) When setting a negative output voltage using error amplifier E/A
3
.
3.2
Setting the Oscillation Frequency
Choose R
T
according to the oscillation frequency (f
OSC
) vs timing resistor (R
T
) characteristics (refer to
Typical
Characteristics Curves f
OSC
vs R
T
). The formula below (3-1) gives an approximation of f
OSC
. However, the result of
formula 3-1 is only an approximation, and the value must be confirmed in actual operation, especially for high-frequency
operation.
f
OSC
[Hz]
1.856 x 10
9
/R
T
[
]
(3-1)
3.3
Preventing Malfunction of the Timer Latch-Method Short Circuit Protection Circuit
The timer latch short-circuit protection circuit operates when the error amplifier outputs of channel 1 or channel 2 (pin 7
and 10) exceed approximately 1.9 V, or when the error amplifier output of channel 3 (pin 14) goes below approximately
0.63 V, and cuts off the output. However, if the rise of the power supply voltage is fast, or if there is noise on the DLY pin
(pin 5), the latch circuit may malfunction and cut the output off.
To prevent this, keep the wiring impedance between the DLY pin and the GND pin (pin 4) low, and avoid applying noise
to the DLY pin.
2
15
14
V
REF
0.3 V
E/A
3
V
REF
V
OUT
= 1 + R
2
R
1
R
2
R
1
R
1
R
2
C
NF
R
NF
V
OUT
(negative voltage)
0.3
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