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參數(shù)資料
| 型號： | CS52843EDR14 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | Current Mode PWM Control Circuit |
| 中文描述： | 電流模式PWM控制電路 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 147K |
| 代理商： | CS52843EDR14 |
Figure 1: Startup voltage for the CS52843.
Undervoltage Lockout
During Undervoltage Lockout (Figure 1), the output driv-
er is biased to sink minor amounts of current. The output
should be shunted to ground with a resistor to prevent
activating the power switch with extraneous leakage cur-
rents.
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
causes the inductor current slope to
increase, thus reducing the duty cycle. This is an inherent
feed-forward characteristic of current mode control, since
the control voltage does not have to change during
changes of input supply voltage.
V
CC
V
ON
=8.4V
V
OFF
= 7.6V
ON/OFF Command
to reset of IC
<15mA
<500
μ
A
V
ON
V
OFF
I
CC
V
CC
4
C
Test Circuit Open Loop Laboratory Test Fixture
V
REF
V
CC
V
OUT
1k
0.1
μ
F
0.1
μ
F
V
REF
V
CC
V
OUT
Gnd
V
FB
Sense
OSC
COMP
5k
100k
4.7k
ErrAdjust
4.7k
Sense
Adjust
R
T
2N2222
C
T
Gnd
A
Typical Performance Characteristics
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
.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
Oscillator Frequency vs C
T
Oscillator Duty Cycle vs R
T
Circuit Description
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CS52843EDR8 | Current Mode PWM Control Circuit |
| CS52845ED14 | Current Mode PWM Control Circuit with 50% Max Duty Cycle |
| CS52845ED8 | Current Mode PWM Control Circuit with 50% Max Duty Cycle |
| CS52845EDR14 | Current Mode PWM Control Circuit with 50% Max Duty Cycle |
| CS52845EDR8 | Current Mode PWM Control Circuit with 50% Max Duty Cycle |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CS52843EDR8 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Current Mode PWM Control Circuit |
| CS52845 | 制造商:CHERRY 制造商全稱:CHERRY 功能描述:Current Mode PWM Control Circuit with 50% Max Duty Cycle |
| CS52845/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode PWM Control Circuit with 50% Max Duty Cycle |
| CS-52845D14 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Mode SMPS Controller |
| CS-52845D8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Mode SMPS Controller |
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