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SP6879D8TGB Datasheet(PDF) 4 Page - SYNC POWER Crop. |
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SP6879D8TGB Datasheet(HTML) 4 Page - SYNC POWER Crop. |
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4 / 8 page  2014/12/15 Ver0.1 Page 4 SP6879 Quasi-Resonant PWM Controller ELECTRICAL CHARACTERISTICS (TA=25℃, VCC=16V, RRI = 20K Ohm unless otherwise specified.) Symbol Parameter Conditions Min. Typ. Max. Unit Supply Voltage ( Vcc Pin ) Istup Startup Current Vcc=UVLO-1.5V 5 15 uA Icc(op) Operating Current VFB = 3V 2.0 4.0 mA VFB = 3V, CL = 1nf 3.0 5.0 mA UVLO (off) Min. Operating Voltage 7.5 V UVLO (on ) Start Threshold Voltage 13.5 V OVP Level Over Voltage Protection 24 V Vcc Clamp Clamping Voltage IVCC = 10mA 26 V Voltage Feedback ( FB Pin ) Isc Short Circuit Current 0.3 mA Vop Open Loop Voltage 5.3 V VTH_BM_on Burst Mode on threshold 0.8 V VTH_BM_off Burst Mode off threshold 0.7 V ZFB Input Impedance 17 KΩ VTLOLP OLP Trip Level 4.4 V TDOLP OLP Delay Time (note) 80 mS Demagnetization ( DEM Pin ) VTH(DEM) Demagnetization Threshold Voltage 75 mV VDEM(H) Input Clamp Voltage High 6 V VDEM(L) Input Clamp Voltage Low -0.7 V Tsupp Suppression of the transformer ringing at start of secondary stoke 2.5 uS TDEM Demagnetization Propagation Delay 250 nS VDEM(OVP) Load OVP trigger point 3.75 V TDEL Number of Cycles to trigger OVP 4 Cycle Current Sensing ( CS Pin ) VCS(L) CS threshold at Zero Duty Cycle Zero duty cycle, VFB=3V 0.415 0.45 0.485 V VCS(H) CS threshold at max Duty Cycle Max duty cycle, VFB=3V 0.8 V VCS(BM) Burst mode CS threshold Zero Output, VFB=1V 0.3 V TLEB Leading Edge Blanking Time 100 nS Gate Driver Output ( GATE Pin ) VOL Output Low Level VCC=15V, Io=100mA 1 V VOH Output High Level VCC=15V, Io=100mA 7.5 V VOC Output Clamp Voltage Level Vcc=18V 16.5 V Tr Rising Time CL = 1nf 80 nS Tf Falling Time CL = 1nf 30 nS Frequency Setup (RI Pin) RI Resistor Range 20 KΩ VRI_open RI open voltage 2.0 V Fburst Burst mode switching frequency 22 KHz FQR(L) Frequency low clamp in QR mode 47 52 57 KHz FQR(H) Frequency high clamp in QR mode 82 90 98 KHz G_PFM PFM mode frequency modulation slope 90 KHz/V ΔF(shuffle) /F Frequency Shuffling Range -4 +4 % TON Maximum ON Time RRI = 20 KΩ 10 13 15 uS TOFF Maximum OFF Time RRI = 20 KΩ 40 55 75 uS |
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