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UPC1934 Datasheet(Fiches technique) 10 Page - NEC

Numéro de pièce UPC1934
Description  DC-DC CONVERTER CONTROL IC
Télécharger  20 Pages
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Fabricant  NEC [NEC]
Site Internet  http://www.nec.com/
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Data Sheet G13567EJ3V0DS00
10
µµµµ PC1934
2.
CONFIGURATION AND OPERATION OF EACH BLOCK
Figure 2-1 Block Diagram
2.1
Reference Voltage Generator
The reference voltage generator is comprised of a band-gap reference circuit, and outputs a temperature-compensated
reference voltage (2.1 V). The reference voltage can be used as the power supply for internal circuits, or as a reference
voltage, and can also be accessed externally via the VREF pin (pin 16).
2.2
Oscillator
The oscillator self-oscillates if a timing resistor is attached to the RT pin (pin 2).
Also, the oscillator outputs the
symmetrical triangular waveform if a timing capacitor is attached to the CT pin (pin 1). This oscillator waveform is input to
the non-inverted input pins of the two PWM comparators to determine the oscillation frequency.
8
10
Error amplifier
Output
section
PWM
comparator
SCP
comparator
OUT2
DTC2
FB2
II2
7
Error amplifier
Output
section
PWM
comparator
OUT1
DTC1
FB1
II1
1
CT
2
RT
Oscillation
section
SQ
Q
GND
DLY
CDLY
15
0.63 V
9
VCC
11
12
13
6
5
4
16
VREF
Q2
Q1
Reference
voltage
section
Under voltage
lock-out
section
IN1
3
IN2
14
Timer latch for
short-circuit
protection section




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