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CS2843ALN8 Folha de dados(PDF) 4 Page - Cherry Semiconductor Corporation

Nome de Peças CS2843ALN8
Descrição Electrónicos  Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout
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Fabricante Electrônico  CHERRY [Cherry Semiconductor Corporation]
Página de início  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

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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
Test Circuit
Undervoltage Lockout
During Undervoltage Lockout (Figure 1), the output driv-
er is biased to a high impedance state. The output should
be shunted to ground with a resistor to prevent output
leakage 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 control, 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 cycle
tends to exceed the maximum allowed to prevent trans-
VCC
ON/OFF Command
to reset of IC
VON
16V
8.4V
VOFF
10V
7.6V
CSX842A CSX843A
<15mA
<1mA
VON VOFF
ICC
VCC
Circuit Description
Typical Performance 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
Oscillator Duty Cycle vs RT
Oscillator Frequency vs CT
Figure 1: Typical Undervoltage Characteristics


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