UC3845D ON Semiconductor, UC3845D Datasheet - Page 12
UC3845D
Manufacturer Part Number
UC3845D
Description
Other Power Management 52kHz 1A Current PWM
Manufacturer
ON Semiconductor
Type
High Performance Current Mode Controllersr
Datasheet
1.UC2845DR2.pdf
(16 pages)
Specifications of UC3845D
Output Voltage Range
4.9 V to 5.1 V
Input Voltage Range
30 V
Operating Temperature Range
0 C to + 70 C
Mounting Style
SMD/SMT
Package / Case
SOIC-14
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
UC3845D8
Manufacturer:
UNITRODE
Quantity:
5 510
Company:
Part Number:
UC3845D8TRG4
Manufacturer:
INTERSIL
Quantity:
6 584
Company:
Part Number:
UC3845DB
Manufacturer:
SHARP
Quantity:
1 064
Part Number:
UC3845DW
Manufacturer:
TI/德州仪器
Quantity:
20 000
L2, L3 − 25 mH at 1.0 A, Coilcraft Z7157.
T1 − Primary: 45 Turns # 26 AWG
T1 −
T1 −
T1 −
T1 −
T1 −
T1 −
4.7k
18k
L1 − 15 mH at 5.0 A, Coilcraft Z7156.
T1 −
T1 −
T1 −
Secondary ± 12 V: 9 Turns # 30 AWG
Secondary 5.0 V: 4 Turns (six strands)
Secondary Feedback: 10 Turns #30 AWG
Core: Ferroxcube EC35−3C8
Bobbin: Ferroxcube EC35PCB1
Gap ≈ 0.01" for a primary inductance of 1.0 mH
0.01
(2 strands) Bifiliar Wound
#26 Hexfiliar Wound
(2 strands) Bifiliar Wound
1.0nF
33k
8(14)
4(7)
2(3)
1(1)
115VA
C
4.7W
+
−
EA
+
OSC
Bias
MDA
202
5(9)
Figure 30. 27 Watt Off−Line Flyback Regulator
All outputs are at nominal load currents, unless otherwise noted.
Line Regulation:
Load Regulation:
Output Ripple:
Efficiency
+
5.0V
−
+
+
−
ref
+
Comp/Latch
250
Test
S
R
T
Q
http://onsemi.com
+
−
± 12 V
± 12 V
± 12 V
5.0 V
5.0 V
5.0 V
+
56k
7(12)
12
V
V
V
mA
V
V
in
in
in
in
in
7(11)
6(10)
5(8)
3(5)
= 95 VAC to 130 VAC
= 115 VAC, I
= 115 VAC, I
= 115 VAC
= 115 VAC
100
+
1N4935
1N4937
4.7k
1N5819
22W
470pF
68
1.0k
Conditions
out
out
1N4935
+
3300pF
= 1.0 A to 4.0 A
= 100 mA to 300
4N50
MTP
0.5W
47
T1
680pF
2.7k
MBR1635
MUR110
MUR110
1000
2200
1000
1N4937
+
+
+
1000
L1
L2
L3
10
10
D = 50 mV or ± 0.5%
D = 24 mV or ± 0.1%
D = 300 mV or ± 3.0%
D = 60 mV or ± 0.25%
40 mV
80 mV
70%
+
+
+
pp
pp
5.0V/4.0A
5.0V RTN
12V/0.3A
±12V RTN
−12V/0.3A
Results