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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)： | 10/20頁 |
| 文件大?。?/td> | 140K |
| 代理商： | UPC1934 |
Data Sheet G13567EJ3V0DS00
10
μ
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 V
REF
pin (pin 16).
2.2
Oscillator
The oscillator self-oscillates if a timing resistor is attached to the R
T
pin (pin 2). Also, the oscillator outputs the
symmetrical triangular waveform if a timing capacitor is attached to the C
T
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
OUT
2
DTC
2
FB
2
I
I2
7
Error amplifier
Output
section
PWM
comparator
OUT
1
DTC
1
FB
1
I
I1
1
C
T
2
R
T
Oscillation
section
S
Q
Q
GND
DLY
C
DLY
15
0.63 V
9
V
CC
11
12
13
6
5
4
16
V
REF
Q
2
Q
1
Reference
voltage
section
Under voltage
lock-out
section
I
N1
3
I
N2
14
Timer latch for
short-circuit
protection section
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