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CS3843BGD14 датащи(PDF) 4 Page - Cherry Semiconductor Corporation

номер детали CS3843BGD14
подробное описание детали  Off-Line Current Mode PWM Control Circuit Off-Line Current Mode PWM Control Circuit
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производитель  CHERRY [Cherry Semiconductor Corporation]
домашняя страница  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS3843BGD14 датащи(HTML) 4 Page - Cherry Semiconductor Corporation

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Undervoltage Lockout
During Undervoltage Lockout (Figure 1), the output driv-
er is biased to a high impedance state. VOUT 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 VCC 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
Test Circuit
VREF
VCC
VOUT
1kΩ
1W
0.1µF
0.1µF
VREF
VCC
VOUT
Gnd
VFB
Sense
OSC
COMP
5kΩ
100kΩ
4.7kΩ
1kΩ
ERROR AMP
ADJUST
4.7kΩ
Sense
ADJUST
RT
2N2222
CT
Gnd
A
CS-3842B
CS-3843B
Circuit Description
Typical Performance Characteristics:
Oscillator Duty Cycle vs RT
Oscillator Frequency vs CT
VCC
ON/OFF Command
to reset of IC
VON
16V
8.4V
VOFF
10V
7.6V
CS3842B CS3843B
<0.5mA
<15mA
VON VOFF
ICC
VCC
Figure 1: Typical Undervoltage Characteristics
.0005
.001
.002
.003
.005
.01
.02
.03
.04
800
900
CT (µF)
700
600
500
400
300
200
100
.05
RT =1.5kΩ
RT =680Ω
RT =10kΩ
100
200
700
1k
2k
5k
7k
10k
80
90
RT (Ω)
70
60
50
40
30
20
10
4k
3k
500
400
300
100


Аналогичный номер детали - CS3843BGD14

производительномер деталидатащиподробное описание детали
logo
ON Semiconductor
CS3843BGD14 ONSEMI-CS3843BGD14 Datasheet
68Kb / 8P
   Off-Line Current Mode PWM Control Circuit
December, 2001 - Rev. 4
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Аналогичное описание - CS3843BGD14

производительномер деталидатащиподробное описание детали
logo
ON Semiconductor
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   Off-Line Current Mode PWM Control Circuit
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logo
Cherry Semiconductor Co...
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ON Semiconductor
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275Kb / 24P
   Current-Mode PWM Controller for Off-line Power Supplies
October, 2011 ??Rev. 7
More results


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