UC3843AD Fairchild Semiconductor, UC3843AD Datasheet

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UC3843AD

Manufacturer Part Number
UC3843AD
Description
IC PWM CNTLLR 8SOIC
Manufacturer
Fairchild Semiconductor
Datasheet

Specifications of UC3843AD

Pwm Type
Controller
Number Of Outputs
1
Frequency - Max
500kHz
Duty Cycle
100%
Voltage - Supply
8.2 V ~ 30 V
Buck
No
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
0°C ~ 70°C
Package / Case
8-SOIC (3.9mm Width)
Frequency-max
500kHz
Duty Cycle (max)
100 %
Output Current
1000 mA
Mounting Style
SMD/SMT
Switching Frequency
500 KHz
Operating Supply Voltage
30 V
Supply Current
17 mA
Maximum Operating Temperature
+ 70 C
Fall Time
40 ns
Minimum Operating Temperature
0 C
Rise Time
40 ns
Synchronous Pin
No
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
UC3843ADFS

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Features
• Low Start Current 0.2mA (typ)
• Operating Range Up To 500KHz
• Cycle by Cycle Current Limiting
• Under Voltage Lock Out With Hysteresis
• Short Shutdown Delay Time: typ.100ns
• High Current Totem-pole Output
• Output Swing Limiting: 22V
Internal Block Diagram
©2000 Fairchild Semiconductor International
UC3842A/UC3843A
SMPS Controller
COMP
R
V
T
C.S
V
/C
REF
FB
T
8
2
1
3
4
Internal
Bias
1/2V
REF
Error Amp
+
-
OSCILLATOR
V
5V
REF
Good LOGIC
1/3
RESET
1V
SET/
C.S
Comp.
Description
The UC3842A/UC3843A are fixed PWM controller for Off-
Line and DC to DC converter applications. The internal cir-
cuits include UVLO, low start up current circuit, tempera-
ture compensated reference, high gain error amplifier,
current sensing comparator, and high current totem-pole out-
put for driving a POWER MOSFET. Also UC3842A/
UC3843A provide low start up current below 0.3mA and
short shutdown delay time typ. 100ns. The UC3842A has
UVLO threshold of 16V(on) and 10V(off). The UC3843A is
8.4V(on) and 7.6V(off). The UC3842A and UC3843A can
operate within 100% duty cycle.
UVLO
8-SOP
8-DIP
PWM
LATCH
R
S
T
1
1
29V
22V
www.fairchildsemi.com
7
5
7
6
5
OUTPUT
GND
PWR
GND
V
PWR
V
CC
C
Rev. 5.0

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UC3843AD Summary of contents

Page 1

... ©2000 Fairchild Semiconductor International Description The UC3842A/UC3843A are fixed PWM controller for Off- Line and converter applications. The internal cir- cuits include UVLO, low start up current circuit, tempera- ture compensated reference, high gain error amplifier, current sensing comparator, and high current totem-pole out- put for driving a POWER MOSFET ...

Page 2

UC3842A/UC3843A Absolute Maximum Ratings Parameter Supply Voltage Output Current Analog Inputs (pin 2, 3) Error Amp. Output Sink Current Power Dissipation Electrical Characteristics (V = 15V 10K , C = 3.3nF Parameter REFERENCE SECTION ...

Page 3

Electrical Characteristics (Continued 15V 10K , C = 3.3nF Parameter ERROR AMPLIFIER SECTION Input Voltage Input Bias Current Open Loop Gain Unity Gain Bandwidth PSRR Output Sink Current Output Source Current Output ...

Page 4

UC3842A/UC3843A Mechanical Dimensions Package 6.40 0.20 0.252 0.008 #1 #4 7.62 0.300 4 8-DIP #8 #5 5.08 MAX 0.200 3.40 0.20 0.134 0.008 3.30 0.30 0.130 0.012 0.33 MIN 0.013 ...

Page 5

Mechanical Dimensions Package #1 #4 0.156 0.50 0.20 0.020 0.008 (Continued) 8-SOP 1.55 0.20 0.061 0.008 #8 #5 6.00 0.30 1.80 MAX 0.236 0.012 0.071 3.95 0.20 0.008 5.72 0.225 UC3842A/UC3843A 0.1~0.25 MIN 0.004~0.001 5 ...

Page 6

... UC3842A/UC3843A Ordering Information Product Number UC3842AN UC3842AD UC3843AN UC3843AD 6 Package Operating Temperature 8 DIP 8 SOP DIP 8 SOP ...

Page 7

UC3842A/UC3843A 7 ...

Page 8

... UC3842A/UC3843A LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR INTERNATIONAL. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, ...

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