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CS51021

Cherry Semiconductor Corporation
Part Number CS51021
Manufacturer Cherry Semiconductor Corporation
Description Enhanced Current Mode PWM Controller
Published Mar 24, 2005
Detailed Description CS51021/22/23/24 CS51021/CS51023 CS51022/CS51024 Enhanced Current Mode PWM Controller Description The CS51021/22/23/24...
Datasheet PDF File CS51021 PDF File

CS51021
CS51021


Overview
CS51021/22/23/24 CS51021/CS51023 CS51022/CS51024 Enhanced Current Mode PWM Controller Description The CS51021/22/23/24 Fixed Frequency PWM Current Mode Controller family provides all necessary features required for AC-DC or DC-DC primary side control.
Several features are included eliminating the additional components needed to implement them externally.
In addition to low start-up current (75µA) and high frequency operation capability, the CS51021/ 22/23/24 family includes overvoltage and undervoltage monitoring, externally programmable dual Device Features s 75µA Max.
Startup Current s Fixed Frequency Current Mode Control s 1MHz Switching Frequency s Undervoltage Protection Monitor s Overvoltage Protection Monitor with Programmable Hysteresis s Programmable Dual Threshold Overcurrent Protection with Delayed Restart s Programmable Soft Start s Accurate Maximum Duty Cycle Limit s Programmable Slope Compensation s Leading Edge Current Sense Blanking s 1A Sink/Source Gate Drive s Bidirectional Synchronization (CS51021/23) s 50ns PWM Propagation Delay s 100µA Max Sleep Current (CS51022/24) threshold overcurrent protection, current sense leading edge blanking, current slope compensation, accurate duty cycle control and an externally available 5V reference.
The CS51021 and CS51023 feature bidirectional synchronization capability, while the CS51022 and CS51024 offer a sleep mode with 100µA maximum IC current consumption.
The CS51021/22/23/24 family is available in a 16 lead narrow body SO package.
Sleep/Synch VCC Start/Stop CS51021 CS51022 CS51023 CS51024 Synch Sleep Synch Sleep Typical Application Diagram 8.
25V/7.
7V 8.
25V/7.
7V 13V/7.
7V 13V/7.
7V VIN (36V to 72V) PGND SYNC/SLEEP 100 51k 11V FZT688 10 BAS21 22µF 18V 0.
1µF 1µ F 100:1 200K,1% 24.
3K 1% 10K 4:1 MBRB2060CT 2:5 VOUT (5V/5A) 100µF 100µF SGND 0.
01µF 10K 4700pF 51K CS51021/51022 22K VC VREF COMP VFB RTCT SYNC/ SLEEP CSS LGnd VCC UV OV ISET SLOPE GATE ISENSE PGnd 10 2.
49K,1% 680pF BA521 10 IRF634...


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