OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

UC2844BN

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
UC3844B, UC3845B, UC2844B, UC2845B
http://onsemi.com
13
MUR110
+
-
+
-
S
R
+
R
R
5.0V Ref
Q
Bias
EA
5(9)
7(11)
6(10)
5(8)
3(5)
0.5
MTP
4N50
1(1)
2(3)
4(7)
8(14)
33k
1.0nF
470pF
150k
100
pF
18k
4.7k
Figure 30. 7 W Off−Line Flyback Regulator
0.01
100
+
1.0k
115 Vac
4.7W
MDA
202
250
56k
4.7k
3300
pF
1N4935 1N4935
+
+
68
47
1N4937
1N4937
680pF
2.7k
L3
L2
L1
++
++
++
1000
1000
2200
10
10
1000
5.0V/4.0A
5.0V RTN
12V/0.3A
±12V RTN
-12V/0.3A
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
MBR1635
T1
22
Osc
T1 -
7(12)
Comp/Latch
T
L1
L2, L3
- 15 mH at 5.0 A, Coilcraft Z7156
- 25 mH at 5.0 A, Coilcraft Z7157
1N5819
Test Conditions Results
Line Regulation: 5.0 V
±12 V
V
in
= 95 Vac to 130 Vac
D = 50 mV or ±0.5%
D = 24 mV or ±0.1%
Load Regulation: 5.0 V
±12 V
V
in
= 115 Vac, I
out
= 1.0 A to 4.0 A
V
in
= 115 Vac, I
out
= 100 mA to 300 mA
D = 300 mV or ±3.0%
D = 60 mV or ±0.25%
Output Ripple: 5.0 V
±12 V
V
in
= 115 Vac 40 mV
pp
80 mV
pp
Efficiency V
in
= 115 Vac 70%
All outputs are at nominal load currents unless otherwise noted.
UC3844B, UC3845B, UC2844B, UC2845B
http://onsemi.com
14
Osc
+
-
Reference
Regulator
+
-
34V
S
R
Q
Internal
Bias
+
0.5mA
Osc
R
R
R
2R
Error
Amplifier
1.0V
7(12)
7(11)
6(10)
5(8)
3(5)
R1
V
in
= 15V
1(1)
2(3)
4(7)
8(14)
10k
1.0nF
The capacitor's equivalent series resistance must limit the Drive Output current to 1.0 A. An additional series resistor
may be required when using tantalum or other low ESR capacitors. The converter's output can provide excellent line
and load regulation by connecting the R2/R1 resistor divider as shown.
Figure 31. Step−Up Charge Pump Converter
5(9)
PWM
T
Latch
Current Sense
Comparator
2.5V
3.6V
V
CC
UVLO
V
ref
UVLO
UC3845B
+
47
1N5819
15 10
1N5819
+
47
R2
Connect to
Pin 2 for
closed loop
operation.
ǒ
R2
R1
) 1
Ǔ
V
O
≈ 2 (V
in
)
Output Load Regulation
(Open Loop Configuration)
I
O
(mA) V
O
(V)
0
2
9
18
36
29.9
28.8
28.3
27.4
24.4
+
-
+
-
S
R
+
R
R
R
2R
5(9)
PWM
T
Latch
Current Sense
Comparator
+
47
15 10
1N5819
+
47
Reference
Regulator
34V
Q
Internal
Bias
0.5mA
Error
Amplifier
1.0V
7(12)
7(11)
6(10)
5(8)
3(5)
V
in
= 15V
1(1)
2(3)
4(7)
8(14)
10k
1.0nF
The capacitor's equivalent series resistance must limit the Drive Output current to 1.0 A.
An additional series resistor may be required when using tantalum or other low ESR capacitors.
Figure 32. Voltage−Inverting Charge Pump Converter
2.5V
3.6V
V
CC
UVLO
V
ref
UVLO
UC3845B
V
O
≈ -V
in
Output Load Regulation
I
O
(mA) V
O
(V)
0
2
9
18
32
−14.4
−13.2
−12.5
−11.7
−10.6
1N5819
+
V
O
= 2.5
UC3844B, UC3845B, UC2844B, UC2845B
http://onsemi.com
15
ORDERING INFORMATION
Device Operating Temperature Range Package Shipping
†
UC384xBD
T
A
= 0° to +70°C
SOIC−14 55 Units/Rail
UC384xBDG
SOIC−14
(Pb−Free)
55 Units/Rail
UC384xBDR2 SOIC−14 2500 Tape & Reel
UC384xBDR2G SOIC−14
(Pb−Free)
2500 Tape & Reel
UC384xBD1 SOIC−8 98 Units/Rail
UC384xBD1G SOIC−8
(Pb−Free)
98 Units/Rail
UC384xBD1R2 SOIC−8 2500 Tape & Reel
UC384xBD1R2G SOIC−8
(Pb−Free)
2500 Tape & Reel
UC384xBN PDIP−8 50 Units/Rail
UC384xBNG PDIP−8
(Pb−Free)
50 Units/Rail
UC284xBD
T
A
= −25° to +85°C
SOIC−14 55 Units/Rail
UC284xBDG
SOIC−14
(Pb−Free)
55 Units/Rail
UC284xBDR2 SOIC−14 2500 Tape & Reel
UC284xBDR2G SOIC−14
(Pb−Free)
2500 Tape & Reel
UC284xBD1 SOIC−8 98 Units/Rail
UC284xBD1G
SOIC−8
(Pb−Free)
98 Units/Rail
UC284xBD1R2 SOIC−8 2500 Tape & Reel
UC284xBD1R2G SOIC−8
(Pb−Free)
2500 Tape & Reel
UC284xBN PDIP−8 50 Units/Rail
UC284xBNG
PDIP−8
(Pb−Free)
50 Units/Rail
UC384xBVD
T
A
= −40° to +105°C
SOIC−14 55 Units/Rail
UC384xBVDG
SOIC−14
(Pb−Free)
55 Units/Rail
UC384xBVDR2 SOIC−14 2500 Tape & Reel
UC384xBVDR2G
SOIC−14
(Pb−Free)
2500 Tape & Reel
UC384xBVD1 SOIC−8 98 Units/Rail
UC384xBVD1G
SOIC−8
(Pb−Free)
98 Units/Rail
UC384xBVD1R2 SOIC−8 2500 Tape & Reel
UC384xBVD1R2G
SOIC−8
(Pb−Free)
2500 Tape & Reel
UC384xBVN PDIP−8 50 Units/Rail
UC384xBVNG
PDIP−8
(Pb−Free)
50 Units/Rail
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
x indicates either a 4 or 5 to define specific device part numbers.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

UC2844BN

Mfr. #:
Buy UC2844BN
Manufacturer:
STMicroelectronics
Description:
Switching Controllers 0.5mA Current Mode
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet