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參數(shù)資料
| 型號(hào)： | CS3842BGD8 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | IC CONVERTER DC/DC 5V 2A SIP10 |
| 中文描述： | 離線式電流模式PWM控制電路脫線電流模式PWM控制電路 |
| 文件頁(yè)數(shù)： | 4/6頁(yè) |
| 文件大?。?/td> | 154K |
| 代理商： | CS3842BGD8 |
Undervoltage Lockout
During Undervoltage Lockout (Figure 1), the output driv-
er is biased to a high impedance state. V
should be
shunted to ground with a resistor to prevent output leak-
age current from activating the power switch.
PWM Waveform
To generate the PWM waveform, the control voltage from
the error amplifier is compared to a current sense signal
which represents the peak output inductor current
(Figure 2). An increase in V
CC
causes the inductor current
slope to increase, thus reducing the duty cycle. This is an
inherent feed-forward characteristic of current mode con-
trol, since the control voltage does not have to change
during changes of input supply voltage.
When the power supply sees a sudden large output cur-
rent increase, the control voltage will increase allowing
the duty cycle to momentarily increase. Since the duty
4
C
Test Circuit
V
REF
V
CC
V
OUT
1k
1W
0.1
μ
F
0.1
μ
F
V
REF
V
CC
V
OUT
Gnd
V
FB
Sense
OSC
COMP
5k
100k
4.7k
1k
ERROR AMP
ADJUST
4.7k
Sense
ADJUST
R
T
2N2222
C
T
Gnd
A
CS-3842B
CS-3843B
Circuit Description
Typical Performance Characteristics:
Oscillator Duty Cycle vs R
T
Oscillator Frequency vs C
T
V
CC
ON/OFF Command
to reset of IC
V
ON
16V 8.4V
V
OFF
10V 7.6V
CS3842B CS3843B
<0.5mA
<15mA
V
ON
V
OFF
I
CC
V
CC
Figure 1: Typical Undervoltage Characteristics
.0005
.001
.002
.003
.005
.01
.02
.03
.04
800
900
F
C
T
(
μ
F)
700
600
500
400
300
200
100
.05
R
T
=1.5k
R
T
=680
R
T
=10k
100
200
700
1k
2k
5k
7k
10k
80
90
D
R
T
(
)
70
60
50
40
30
20
10
4k
3k
500
400
300
100
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| CS3842BGDR14 | 制造商:CHERRY 制造商全稱(chēng):CHERRY 功能描述:Off-Line Current Mode PWM Control Circuit Off-Line Current Mode PWM Control Circuit |
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