參數(shù)資料
型號(hào)： UPC1933GR
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)： 11/20頁(yè)
文件大?。?/td> 119K
代理商： UPC1933GR
Data Sheet G13690EJ3V0DS00
11
μ
PC1933
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 V
REF
pin (pin 4).
2.2
Oscillator
The oscillator self-oscillates if a timing resistor is attached to the R
T
pin (pin 7). This oscillator waveform is input to the
inverted input pin of the PWM comparator to determine the oscillation frequency.
2.3
Under Voltage Lock-out Circuit
The under voltage lock-out circuit prevents malfunctioning of the internal circuits when the supply voltage is low, such as
when the supply voltage is first applied, or when the power supply is interrupted. When the voltage is low, the output
transistor is cut off at the same time.
2.4
Error Amplifier
The non-inverted input pin of the error amplifier is connected internally to 0.3 V (the input threshold voltage is 0.3 V
(TYP)). The first stage of the error amplifier is a P-channel MOS transistor input.
6
5
Error amplifier
0.3 V
OUT
7
R
T
FB
I
I
S
Q
Q
GND
DLY
C
DLY
2
1.92 V
3
V
CC
8
1
4
V
REF
Q
2
Q
1
Dead time setting: 85 %
(internally fixed)
Soft start
select switch
SCP
comparator
PWM
comparator
Oscillation
section
Under voltage
lock-out
section
Reference
voltage
section
Output
section
Timer latch for
short-circuit
protection section
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