in this video number {975} How to check, SMPS PWM IC switching or not? i demonstrated how we can test/ check / verify any PWM controller IC (pulse width modulation controller ic) in smps switch mode power supply using multimeter. i discussed (UC1842 / UC2842 / UC3842 / UC1843, / UC2843 / UC3843 / UC1844 / UC2844 / UC3844 / UC1845 / UC2844 / UC3844 / KA1842 / KA2842 / KA3842 / KA1843, / KA2843 / KA3843 / KA1844 / KA2844 / KA3844 / KA1845 / KA2844 / KA3844. when vcc voltage are applied to its vcc pin number 7 and return to pin 5. it produces 5 volt reference voltage from pin number 8. pin 4 is RT / CT. pin 4 also can be configured with any external clock signal. it have 2 shutdown techniques.
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00:00 how to test smps pwm controller ic with multimeter
01:02 UC1842, UC1843, UC1844, UC1845 working vcc voltage
01:35 UC1842, UC1843, UC1844, UC1845 duty cycle
02:24 how UC384X or KA384X ic works in smps circuit
03:29 how vcc startup circuit works in UC384X or KA384X ics
03:43 what is OLP, UVLO, VCC threshold
04:23 why vcc voltage fluctuate in smps
07:12 current sense circuit in UC384X or KA384X ic
07:51 shutdown / protection techniques in UC384X or KA384X ic
10:22 What id RT / CT in UC384X or KA384X ic
11:40 why smps has fluctuation on vcc capacitor
14:11 UC384X or KA384X ic driving push pull dc to dc converter
16:06 how to test vcc voltage in UC384X or KA384X ic
18:05 how to test reference voltage in UC384X or KA384X ic
19:30 how to test current sense signal in UC384X or KA384X ic
20:54 how to check that smps is switching or not?
23:16 how to test switching frequency SMPS in UC384X or KA384X ic using digital multimeter