UPC1934 查看數據表（PDF） - NEC => Renesas Technology

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UPC1934

DC-DC CONVERTER CONTROL IC

NEC => Renesas Technology 

µ PC1934

2. CONFIGURATION AND OPERATION OF EACH BLOCK

Figure 2-1 Block Diagram

DTC1 6

FB1 5

II1 4

IN1 3

DTC2 11

FB2 12

II2 13

IN2 14

Error amplifier

Error amplifier

VREF 16

VCC 9

Reference

voltage

section

DLY

15

CDLY

Oscillation

section

PWM

comparator

Output

section

PWM

comparator

Under voltage

lock-out

section

Output

section

SCP

comparator

Q1

Q2

0.63 V

SQ

Q

Timer latch for

short-circuit

protection section

2 RT

1 CT

7 OUT1

10 OUT2

8 GND

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.

10

Data Sheet G13567EJ3V0DS00

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