KA3842B Fairchild SMPS Controller Data Sheet
Download PDF datasheet for Fairchild Semiconductor KA3842B Fixed Frequency Current-Mode PWM Controller (EN) 12 pages Rev.5.0 2000 zip
Description
This PDF datasheet is for the Fairchild KA3842B PWM Controller.
About the Item
Fairchild Semiconductor KA3842B Fixed Frequency Current-Mode PWM SMPS Controller
The KA3842B is a fixed frequency current-mode PWM controller. They are specially designed for Off – Line and DC-to-DC converter applications with minimum external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier. current sensing comparator, and a high current totempole output Ideally suited for driving a power MOSFET. Protection circuity Includes built in under-voltage lockout and current limiting.
The KA3842B has UVLO thresholds of 16V (on) and 10V (off).
The KA3842B can operate within 100% duty cycle.
FEATURES
– Low Start Up Current
– Maximum Duty Clamp
– UVLO With Hysteresis
– Operating Frequency Up To 500KHz
(PDF) DATASHEET (ENGLISH)
SUMMARY OF CONTENTS
INTERNAL BLOCK DIAGRAM (PINOUT)
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
– Reference Section
– Error Amplifier Section
– Current Sense Section
– Output Section
– Under-Voltage Lockout Section
– Pwm Section
– Total Standby Current
Figure 1. Open Loop Test Circuit
Figure 2. Under Voltage Lockout
Figure 3. Error Amp Configuration
Figure 4. Current Sense Circuit
Figure 5. Oscillator Waveforms and Maximum Duty Cycle
Figure 8. Shutdown Techniques
Figure 9. Slope Compensation
Figure 10. TEMPERATURE DRIFT (Vref)
Figure 11. TEMPERATURE DRIFT (Ist)
Figure 12. TEMPERATURE DRIFT (Icc)
MECHANICAL DIMENSIONS
ORDERING INFORMATION
Why download the Datasheet?
This datasheet provides all the information from Fairchild Semiconductor about the KA3842B PWM Controller, as detailed in the table of contents. Reading it completely will address most questions you might have. You can download and save it for offline use, including viewing it on your device or printing it for your convenience if you prefer a paper version.
How to download the Datasheet?
Download it by clicking the button below
Helped you out?
Glad to hear that. It would be awesome if you could . . .
