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UPC1934 Datasheet(Fiches technique) 13 Page - NEC

Numéro de pièce UPC1934
Description  DC-DC CONVERTER CONTROL IC
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Fabricant  NEC [NEC]
Site Internet  http://www.nec.com/
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Data Sheet G13567EJ3V0DS00
13
µµµµ PC1934
3.2
Setting the Oscillation Frequency
Choose RT according to the oscillation frequency (fOSC) vs timing resistor (CT, RT) characteristics (refer To Typical
Characteristics Curves fOSC vs CT, RT). The formula below (3-1) gives an approximation of fOSC. 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.
fOSC [Hz]
≅ 0.375/(CT [F] x RT [Ω]) (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/A1
(2) Error amplifier E/A2
16
3
4
5
6
VREF
DTC1
E/A1
16
14
13
12
11
VREF
DTC2
E/A2




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