UC3843D8 UNITRODE, UC3843D8 Datasheet - Page 8

• Manufacturer Part Number: UC3843D8
• Description: PWM CONTROLLER, SMD, 3843, SOIC8
• Manufacturer: UNITRODE

Specifications of UC3843D8

• Input Voltage: 15V
• Output Voltage: 5V
• Output Current: 200mA
• Frequency: 500kHz
• Power Dissipation Pd: 650mW
• Supply Voltage Range: 12V To 25V
• Digital Ic Case Style: SOIC
• No. Of Pins: 8
• Operating: RoHS Compliant

UC1842/3/4/5
UC2842/3/4/5
UC3842/3/4/5
SLUS223C – APRIL 1997 – REVISED JUNE 2007
8
OFFLINE FLYBACK REGULATOR
Power Supply Specifications
SLOPE COMPENSATION
A fraction of the oscillator ramp can be resistively summed with the current sense signal to provide slope
compensation for converters requiring duty cycles over 50%.
a. 5VAC to 130VA (50 Hz/60 Hz)
a. +5 V, 5%; 1A to 4A load
b. +12 V, 3%; 0.1A to 0.3A load
c. –12 V, 3%; 0.1A to 0.3A load
117 VAC
1. Input Voltages
2. Line Isolation: 3750 V
3. Switchng Frequency: 40 kHz
4. Efficiency at Full Load 70%
5. Output Voltage:
5
R1
1 W
Ripple voltage: 50 mV P-P Max
Ripple voltage: 100 mV P-P Max
Ripple voltage: 100 mV P-P Max
VARO
VM 68
R4
4.7 k
C5
0.01 F
R5 150 k
100 pF
C14
C1
250 F
250 V
R3
20 k
R6
10 k
C6
0.0022 F
UC1842/3
2
1
8
4
R
I
SENSE
UC3844
T
V
/ C
REF
56 k
7
5
2 W
T
R2
6
3
8
4
3
100 F
25 V
C2
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USD1120
22 F
0.1 mF
C3
4.7 k
D2
1N3612
R12
2 W
C
68
22
T
3 W
R7
R9
C7
470 pF
1 k
R8
R
T
R1
C
C4
47 F
25 V
C9
3300 pF
600 V
D4
1N3613
D3
1N3612
R13
20 k
R2
NC
N
P
R10
0.55
1 W
Q1
UFN833
T1
I
R
SENSE
SENSE
N5
N12
N12
U9D946
4700 F
D6
UF81002
UES1002
10 V
C10
D7
D8
L1
C12
2200 F
16 V
C13
2200 F
16 V
C8
680 pF
600 V
D8
1N3613
C11
4700 F
10 V
R11
2.7 k
2 W
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+6 V
COM
+12 V
−12 V
12 V COM