MOC3051M, MOC3052M, MOC3053M TRIAC DRIVER VCC RLED R POWER TRIAC AC LINE CONTROL Q LOAD RET. RLED = (VCC − VFLED − VSATQ) / IFT R = VPAC / ITSM Figure 7. Basic Driver Circuit TRIAC DRIVER VCC RLED R POWER TRIAC RS AC LINE MOV CS CONTROL LOAD RET. Typical Snubber values RS = 33 W, CS = 0.01 mF MOV (Metal Oxide Varistor) protects power triac and driver from transient overvoltages > VDRM max Figure 8. Triac Driver Circuit for Noisy Environments POWER TRIAC TRIAC DRIVER VCC RLED R RS MOV AC LINE CONTROL CS RET. LOAD Recommended snubber to pass IEEE472 and IEC255−4 noise tests RS = 47 W, CS = 0.01 mF Figure 9. Triac Driver Circuit for Extremely Noisy Environments AC Line 0° 180° LED PW LED Current LED turn off min. 200 ms Figure 10. Minimum Time for LED Turn Off to Zero Crossingwww.onsemi.com7