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UC3844 Datasheet(PDF) 6 Page - Unisonic Technologies

Part No. UC3844
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3844 Datasheet(HTML) 6 Page - Unisonic Technologies

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UC3844/45
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
6 of 7
www.unisonic.com.tw
QW-R103-010,C
TYPICAL CHARACTERISTICS
100
50
10
5.0
1.0
10k
20k
50k
100k
Oscillator Frequency, IOSC (Hz)
200k
500k 1.0M
Timing Resistor vs. Oscillator Frequency
2.0
20
75
65
60
10k
20k
50k
100k
200k
500k
1.0M
Output Deadtime vs. Oscillator Frequency
55
70
VCC = 15V
TA = 25℃
100
pF
200
pF
500
pF
1.0n
F
2.0n
F
5.0n
F
C
T
= 10
nF
Note: Output Switches At
One-Half The Oscillator
Frequency
50
Oscillator Frequency, IOSC (Hz)
1.0nF
2.0nF
5.0nF
CT = 10nF
100pF
200pF
500pF
100
80
40
20
-20
10
100
1.0k
10k
Frequency, f (Hz)
100k
1.0M
10M
Error Amp Open Loop Gain Phase vs. Frequency
0
60
1.2
0.8
0.4
02.0
4.0
6.0
8.0
Current Sense Input Threshold vs. Error Amp
Output Voltage
0.2
1.0
VCC = 15V
VOUT = 2.0V ~ 4.0V
RL = 100k
TA = 25℃
Phase
Gain
0
Error Amp Output Voltage, VOUT (V)
0
30
90
120
180
150
60
0.6
TA = 25℃
VCC = 15V
TA = 125℃
TA = -55℃


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