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UC2844NG4 Datasheet(PDF) 8 Page - Texas Instruments

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Part No. UC2844NG4
Description  CURRENT MODE PWM CONTROLLER
Download  28 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

UC2844NG4 Datasheet(HTML) 8 Page - Texas Instruments

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