UC3843BVD1G ON Semiconductor, UC3843BVD1G Datasheet - Page 15
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UC3843BVD1G
Manufacturer Part Number
UC3843BVD1G
Description
IC CTRLR CURRENT MODE HP 8-SOIC
Manufacturer
ON Semiconductor
Datasheet
1.UC3842BDR2G.pdf
(21 pages)
Specifications of UC3843BVD1G
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
275kHz
Duty Cycle
96%
Voltage - Supply
8.2 V ~ 25 V
Buck
No
Boost
Yes
Flyback
Yes
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
-40°C ~ 105°C
Package / Case
8-SOIC (3.9mm Width)
Frequency-max
275kHz
Duty Cycle (max)
96 % (Typ)
Output Voltage
4.9 V to 5.1 V
Output Current
1000 mA (Max)
Mounting Style
SMD/SMT
Switching Frequency
500 KHz
Operating Supply Voltage
30 V
Maximum Operating Temperature
105 C
Fall Time
50 ns
Minimum Operating Temperature
- 40 C
Rise Time
50 ns
Synchronous Pin
No
Topology
Boost or Flyback or Forward
Number Of Pwm Outputs
1
On/off Pin
No
Adjustable Output
No
Switching Freq
500KHz
Operating Supply Voltage (max)
30V
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Package Type
SOIC N
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
4.7k
18k
All outputs are at nominal load currents, unless otherwise noted
Line Regulation: 5.0 V
Load Regulation: 5.0 V
Output Ripple:
Efficiency
100
pF
0.01
4700pF
Test
150k
10k
8(14)
4(7)
2(3)
1(1)
115 Vac
±12 V
±12 V
5.0 V
±12 V
4.7
W
EA
Figure 34. 27 W Off−Line Flyback Regulator
V
V
V
V
V
R
R
in
in
in
in
in
I
I
out
out
+
= 95 to 130 Vac
= 115 Vac,
= 115 Vac,
= 115 Vac
= 115 Vac
Osc
= 1.0 A to 4.0 A
= 100 mA to 300 mA
Bias
MDA
Conditions
202
-
+
5(9)
5.0V Ref
+
Comp/Latch
D = 50 mV or ± 0.5%
D = 24 mV or ± 0.1%
D = 300 mV or ± 3.0%
D = 60 mV or ± 0.25%
250
S
R
http://onsemi.com
Q
40 mV
80 mV
Results
70%
+
-
15
56k
7(12)
pp
pp
7(11)
6(10)
5(8)
3(5)
100
1N5819
4.7k
+
1N4935
1N4937
68
22
470pF
1.0k
1N4935
3300
pF
47
MTP
4N50
+
0.5
T1
680pF
L2, L3
T1 -
2.7k
L1
MBR1635
Primary: 45 Turns #26 AWG
Secondary ±12 V: 9 Turns #30 AWG
(2 Strands) Bifiliar Wound
Secondary 5.0 V: 4 Turns (six strands)
#26 Hexfiliar Wound
Secondary Feedback: 10 Turns
#30 AWG (2 strands) Bifiliar Wound
Core: Ferroxcube EC35-3C8
Bobbin: Ferroxcube EC35PCB1
Gap: ≈ 0.10" for a primary inductance
of 1.0 mH
MUR110
MUR110
- 15 mH at 5.0 A, Coilcraft Z7156
- 25 mH at 5.0 A, Coilcraft Z7157
2200
1000
1000
+
+
+
1N4937
1000
L2
L1
L3
10
10
+
+
+
5.0V/4.0A
5.0V RTN
12V/0.3A
±
-12V/0.3A
12V RTN