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SP6878 Datasheet(PDF) 4 Page - SYNC POWER Crop. |
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SP6878 Datasheet(HTML) 4 Page - SYNC POWER Crop. |
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4 / 8 page  2013/8/1 V3 Page 4 SP6878 Quasi-Resonant PWM Controller ELECTRICAL CHARACTERISTICS (TA=25 , V ℃ CC=16V, RFR = 20K Ohm unless otherwise specified.) Symbol Parameter Conditions Min. Typ. Max. Unit Supply Voltage ( Vcc Pin ) Istt Startup Current Vcc=UVLO-1.5V 5 15 uA Iop 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 19 V Vcc Clamp Clamping Voltage IVCC = 5mA 20 V Voltage Feedback ( FB Pin ) Isc Short Circuit Current 1.5 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 4 KΩ TLOLP OLP Trip Level 4.4 V TDOLP OLP Delay Time (note) 80 mS Demagnetization ( DEM Pin ) VTH(DEM) Demagnetization Threshold Voltage 75 mV VCH Input Clamp Voltage High 6 V VCL Input Clamp Voltage Low -0.7 V Tsupp Suppression of the transformer ringing at start of secondary stoke 2.5 uS TDEM Demag Propagation Delay 250 nS VTH_ OVP Output OVP trigger point 3.75 V Current Sensing ( CS Pin ) VTH_ Duty_zero Internal current limiting threshold Zero duty cycle, VFB=3V 0.415 0.45 0.485 V VTH_ Duty_max Internal current limiting threshold Max duty cycle, VFB=3V 0.8 V VTH_ CS_min Burst mode CS threshold Zero Output, VFB=1V 0.3 V TLEB Leading Edge Blanking Time 300 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 VG_Clamp Output Clamp Voltage Level Vcc=18V 16.5 Tr Rising Time CL = 1nf 80 nS Tf Falling Time CL = 1nf 30 nS Frequency Setup (FR Pin) RFR Resistor Range 20 KΩ V_FR_open FR open voltage 2.0 V Fburst Burst mode switching frequency 22 KHz Fmax_QR_L Frequency low clamp in QR mode 47 52 57 KHz Fmin_QR_H Frequency high clamp in QR mode 82 90 98 KHz G_PFM PFM mode frequency modulation slope 90 KHz Δ F(shiffle) /F Fmin_QR_L frequency shuffling range -4 +4 % TON Maximum ON Time RFR = 20 KΩ 10 13 15 uS |
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