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CS52843 Arkusz danych(PDF) 4 Page - Cherry Semiconductor Corporation

Numer części CS52843
Szczegółowy opis  Current Mode PWM Control Circuit
PDF  6 Pages
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Producent  CHERRY [Cherry Semiconductor Corporation]
Strona internetowa  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS52843 Arkusz danych(HTML) 4 Page - Cherry Semiconductor Corporation

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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 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.
VCC
VON =8.4V
VOFF = 7.6V
ON/OFF Command
to reset of IC
<15mA
<500µA
VON
VOFF
ICC
VCC
4
Test Circuit Open Loop Laboratory Test Fixture
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
Typical Performance Characteristics
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
.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
Oscillator Frequency vs CT
Oscillator Duty Cycle vs RT
Circuit Description



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