UC2843BD1G ON Semiconductor, UC2843BD1G Datasheet - Page 14

• Manufacturer Part Number: UC2843BD1G
• Description: IC CTRLR CURRENT MODE HP 8-SOIC
• Manufacturer: ON Semiconductor

Specifications of UC2843BD1G

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 275kHz
• Duty Cycle: 96%
• Voltage - Supply: 11 V ~ 25 V
• Buck: No
• Boost: Yes
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -25°C ~ 85°C
• Package / Case: 8-SOIC (3.9mm Width)
• Frequency-max: 275kHz
• Duty Cycle (max): 96 %
• Output Voltage: 4.95 V to 5.05 V
• Output Current: 1000 mA
• Mounting Style: SMD/SMT
• Switching Frequency: 500 KHz
• Operating Supply Voltage: 30 V
• Maximum Operating Temperature: + 85 C
• Fall Time: 50 ns
• Minimum Operating Temperature: - 25 C
• Rise Time: 50 ns
• Synchronous Pin: No
• Topology: Boost, Flyback, Forward
• Input Voltage: 15V
• Frequency: 250kHz
• Power Dissipation Pd: 702mW
• Supply Voltage Range: 8.5V To 30V
• Digital Ic Case Style: SOIC
• No. Of Pins: 8
• Operating Temperature Range: -25°C To +85°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

From V
O
R
R
i
d
MPS3904
R
Slope
C
f
C
T
R
8(14)
The buffered oscillator ramp can be resistively summed with either the voltage
feedback or current sense inputs to provide slope compensation.
4(7)
2(3)
1(1)
T
R
Error Amp compensation circuit for stabilizing any current mode topology except for boost and flyback
converters operating with continuous inductor current.
f
C
Figure 32. Error Amplifier Compensation
From V
R
p
Error Amp compensation circuit for stabilizing current mode boost and flyback
topologies operating with continuous inductor current.
p
O
- 3.0m
EA
Figure 33. Slope Compensation
R
R
R
From V
R
i
R
R
d
d
i
R
+
f
≥ 8.8 k
Osc
O
1.0mA
Bias
C
C
http://onsemi.com
f
f
2R
1(1)
1(1)
2(3)
2(3)
R
R
R
f
f
-
+
5(9)
14
1.0V
2.5V
2.5V
-m
5.0V Ref
EA
EA
m
Comp/Latch
+
+
S
R
1.0mA
1.0mA
Q
2R
2R
R
R
+
-
5(9)
5(9)
7(12)
36V
7(11)
6(10)
5(8)
3(5)
V
CC
R
V
S
in