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參數(shù)資料
| 型號： | UPC1934 |
| 廠商： | NEC Corp. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | RSS Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 05V; Output Voltage (Vdc): 05V; Power: 1W; 1kVDC and 3kVDC Isolation Options; Approved for Medical Applications; Suitable for Automated Assembly; 8, 10 and 12 pin Pinning Style Options; Optional Continuous Short Circuit Protected; Efficiency to 85% |
| 中文描述： | 的DC - DC轉(zhuǎn)換器控制IC |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 140K |
| 代理商： | UPC1934 |
Data Sheet G13567EJ3V0DS00
13
μ
PC1934
3.2
Setting the Oscillation Frequency
Choose R
T
according to the oscillation frequency (f
OSC
) vs timing resistor (C
T
, R
T
) characteristics (refer To
Typical
Characteristics Curves f
OSC
vs C
T
, 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]
0.375/(C
T
[F] x 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 (pin 5 and 12) 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 15), the latch circuit may malfunction and cut the output off.
To prevent this, lower the wiring impedance between the DLY pin and the GND pin (pin 8), and avoid applying noise to
the DLY pin.
3.4
Connecting Unused Error Amplifiers
When one of the two control circuits is used, connect the circuit so that the output of the error amplifier of unused circuit
is high. Figure 3-2 shows examples of how to connect unused error amplifiers.
Figure 3-2 Examples of Connecting Unused Error Amplifiers
(1) Error amplifier E/A
1
(2) Error amplifier E/A
2
16
3
4
5
6
V
REF
DTC
1
E/A
1
16
14
13
12
11
V
REF
DTC
2
E/A
2
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