CS3843A ON Semiconductor, CS3843A Datasheet

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CS3843A

Manufacturer Part Number
CS3843A
Description
Manufacturer
ON Semiconductor
Datasheet

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implement off–line fixed frequency current–mode control with a
minimum number of external components.
temperature–controlled oscillator with an internally trimmed
discharge current to minimize variations in frequency. A precision
duty–cycle clamp eliminates the need for an external oscillator when a
50% duty–cycle is used. Duty–cycles greater than 50% are also
possible. On board logic ensures that V
output stage is enabled. Ion implant resistors provide tighter control of
undervoltage lockout.
limiting, and a high–current totem pole output for driving capacitive
loads, such as the gate of power MOSFET. The output is LOW in the
off state, consistent with N–channel devices.
8 and14 lead packages for surface mount (SO) applications as well as
8 lead PDIP packages.
Features
June, 2001 – Rev. 3
The CS284XA, CS384XA provides all the necessary features to
T h e C S 3 8 4 X A f a m i l y i n c o r p o r a t e s a n e w p r e c i s i o n
Other features include low startup current, pulse–by–pulse current
The CS384XA series of current–mode control ICs are available in
Optimized for Off–line Control
Internally Trimmed Temperature Compensated Oscillator
Maximum Duty–Cycle Clamp
V
Low Startup Current
Pulse–By–Pulse Current Limiting
Improved Undervoltage Lockout
Double Pulse Suppression
1.0% Trimmed Bandgap Reference
High Current Totem Pole Output
Semiconductor Components Industries, LLC, 2001
REF
Stabilized Before Output Stage is Enabled
REF
is stabilized before the
1
8
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
14
8
1
1
1
ORDERING INFORMATION
x
y
A
WL, L
YY, Y
WW, W = Work Week
http://onsemi.com
CASE 751A
CASE 626
CASE 751
N SUFFIX
D SUFFIX
D SUFFIX
SO–14
= 2 or 3
= 2 or 3
= Assembly Location
= Wafer Lot
= Year
DIP–8
SO–8
Publication Order Number:
14
1
MARKING
DIAGRAM
1
8
CSx84yA
AWLYWW
8
1
x84yA
ALYWX
x84yA
YYWW
CS2842A/D
AWL

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CS3843A Summary of contents

Page 1

The CS284XA, CS384XA provides all the necessary features to implement off–line fixed frequency current–mode control with a minimum number of external components ...

Page 2

... CS2842A, CS3842A, CS2843A, CS3843A DIP–8 & SO– COMP V REF Sense V OUT OSC GND V CC Undervoltage Lock–out Circuit 34 V GND 16 V/10 V (8.4 V/7.6 V) 2.50 V OSC Oscillator + 2R V – Error R Amplifier COMP Sense ( ) Indicates CS2843A/3843A Figure 1. Block Diagram PIN CONNECTIONS SO–14 ...

Page 3

... CS2842A, CS3842A, CS2843A, CS3843A MAXIMUM RATINGS* Supply Voltage (I < 30 mA) CC Supply Voltage (Low Impedance Source) Output Current Output Energy (Capacitive Load) Analog Inputs (V , Sense) FB Error Amp Output Sink Current Package Thermal Resistance, PDIP–8 Junction–to–Case Junction–to–Ambient Package Thermal Resistance, SO–8 Junction– ...

Page 4

... CS2842A, CS3842A, CS2843A, CS3843A ELECTRICAL CHARACTERISTICS (continued V 680 , C = 0.022 F for triangular mode unless otherwise stated.) Characteristic Error Amp Section Input Voltage V Input Bias Current V A 2.0 VOL Unity Gain Bandwidth Note 4. PSRR 12 Output Sink Current V Output Source Current V V High V OUT ...

Page 5

... CS2842A, CS3842A, CS2843A, CS3843A ELECTRICAL CHARACTERISTICS (continued V 680 , C = 0.022 F for triangular mode unless otherwise stated.) Characteristic Test Conditions Undervoltage Lockout Section Start Threshold – Min. Operating Voltage After Turn On *Adjust V above the start threshold before setting PACKAGE PIN DESCRIPTION Package Pin Number DIP– ...

Page 6

... CS2842A, CS3842A, CS2843A, CS3843A 2N2222 4.7 k 100 k 1.0 k ERROR AMP ADJUST 5.0 k Sense 4.7 k ADJUST V CC ON/OFF Command CSX842A OFF I CC < < 1 OFF Figure 5. Typical Undervoltage Characteristics Undervoltage Lockout During Undervoltage Lockout (Figure 5), the output driver is biased to a high impedance state. The output should be shunted to ground with a resistor to prevent output leakage current from activating the power switch ...

Page 7

... CS2842A, CS3842A, CS2843A, CS3843A V REF * V lower REF * V upper V REF * lower REF * upper Substituting in typical values for the parameters in the above formulas 5.0 V REF V = 2.7 V upper V = 1.0 V lower 0.5534R 2.3 * 0.0083R 4.0 * 0.0083R T The frequency and maximum duty cycle can be determined using the Typical Performance Characteristic graphs ...

Page 8

... CS2842A, CS3842A, CS2843A, CS3843A ORDERING INFORMATION Device Temperature Range CS2842ALN8 CS2843ALN8 – CS2842ALD14 CS2842ALDR14 CS3842AGN8 CS3842AGD8 CS3842AGDR8 CS3842AGD14 CS3842AGDR14 CS3843AGN8 CS3843AGD8 CS3843AGDR8 CS3843AGD14 CS3843AGDR14 Package DIP–8 DIP–8 SO–14 SO–14 DIP–8 SO–8 SO–8 SO–14 SO–14 DIP–8 SO–8 SO–8 SO– ...

Page 9

... CS2842A, CS3842A, CS2843A, CS3843A –B– F –A– NOTE 2 C –T– –X– –Y– –Z– PACKAGE DIMENSIONS DIP–8 N SUFFIX CASE 626–05 ISSUE SO–8 D SUFFIX CASE 751–07 ISSUE http://onsemi.com ...

Page 10

... CS2842A, CS3842A, CS2843A, CS3843A –A– –B– G –T– PACKAGE DIMENSIONS SO–14 D SUFFIX CASE 751A–03 ISSUE http://onsemi.com ...

Page 11

... CS2842A, CS3842A, CS2843A, CS3843A Notes http://onsemi.com 11 ...

Page 12

... CS2842A, CS3842A, CS2843A, CS3843A ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “ ...

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