KA3845B Fairchild SMPS Controller Data Sheet
Download PDF datasheet for Fairchild Semiconductor KA3845B Fixed Frequency Current-Mode PWM Controller (EN) 12 pages Rev.5.0 2000 zip
Description
This PDF datasheet is for the Fairchild KA3845B PWM Controller.
Fairchild Semiconductor KA3845B Fixed Frequency Current-Mode PWM SMPS Controller
The KA3845B 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 KA3845B is 8.5V (on) and 7.9V (off).
The KA3845B can operate with 50% duty cycle.
FEATURES
– Low Start Up Current
– Maximum Duty Clamp
– UVLO With Hysteresis
– Operating Frequency Up To 500KHz
(PDF) DATASHEET (ENGLISH)
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
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