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UC3842D データシート(PDF) 7 Page - NXP Semiconductors

部品番号 UC3842D
部品情報  Current-mode PWM controller
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メーカー  PHILIPS [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

UC3842D データシート(HTML) 7 Page - NXP Semiconductors

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Philips Semiconductors Linear Products
Product specification
UC3842
Current-mode PWM controller
August 31, 1994
1106
OFF-LINE FLYBACK REGULATOR
UC3842
4.7 1W
673-3
AC
INPUT
250V
56k
1W
16V
20k
150k
3.6k
100pF
COMP
10k
2
1
8
4
7
6
3
5
GND
CUR
SEN
OUT
27
20k
1k
0.85
UFN432
1N3613
ISOLATION
BOUNDARY
2.5k
820pF
1N3613
400V
4.7k
4W
T1
USD735
10V
DC
OUT
(5V 2–5A)
+
220
µF
10
µF
20V
0.01
µF
0.01
µF
0.0047
µF
0.01
µF
4700
µF
470pF
VFB
VREF
RT/CT
VCC
NOTES:
T1: Coilcraft E-4140-B
Primary – 97 turns
single AWG24
Secondary – 4 turns
4 parallel
AWG22
control – 9 turns
–3 parallel AWG28
SPECIFICATIONS
Input line voltage:
90VAC to 130VAC
Input frequency:
50 or 60Hz
Switching frequency:
40kHz
±10%
Output power:
25W maximum
Output voltage:
5V
±5%
Output current:
2 to 5A
Line regulation:
0.01%/V
Load regulation:
8%/A*
Efficiency @ 25 W,
VIN=90VAC:
70%
VIN=130VAC:
65%
Output short-circuit current:
2.5A average
NOTE:
This circuit uses a low-cost feedback scheme in which the DC
voltage developed from the primary-side control winding is sensed
by the UC3842 error amplifier. Load regulation is therefore
dependent on the coupling between secondary and control
windings, and on transformer leakage inductance. For applications
requiring better load regulation, a UC1901 Isolated Feedback
Generator can be used to directly sense the output voltage.


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