SP6878 Datasheet, PDF (4/8 Pages) SYNC POWER Crop. – Quasi-Resonant PWM Controller

SP6878
Quasi-Resonant PWM Controller
ELECTRICAL CHARACTERISTICS
(T_A=25℃, V_CC=16V, RFR = 20K Ohm unless otherwise specified.)
Symbol
Parameter
Conditions
Supply Voltage ( Vcc Pin )
Istt
Startup Current
Vcc=UVLO-1.5V
Iop
Operating Current
VFB = 3V
VFB = 3V, CL = 1nf
UVLO (off) Min. Operating Voltage
UVLO (on ) Start Threshold Voltage
OVP Level Over Voltage Protection
Vcc Clamp Clamping Voltage
IVCC = 5mA
Voltage Feedback ( FB Pin )
Isc
Short Circuit Current
Vop
Open Loop Voltage
VTH_BM_on Burst Mode on threshold
VTH_BM_off Burst Mode off threshold
ZFB
Input Impedance
TLOLP
TDOLP
OLP Trip Level
OLP Delay Time (note)
Demagnetization ( DEM Pin )
VTH(DEM) Demagnetization Threshold Voltage
VCH Input Clamp Voltage High
VCL
Input Clamp Voltage Low
Tsupp
Suppression of the transformer ringing
at start of secondary stoke
TDEM Demag Propagation Delay
VTH_ OVP Output OVP trigger point
Current Sensing ( CS Pin )
VTH_
Duty_zero
Internal current limiting threshold
Zero duty cycle, VFB=3V
VTH_
Duty_max
Internal current limiting threshold
Max duty cycle, VFB=3V
VTH_ CS_min Burst mode CS threshold
Zero Output, VFB=1V
TLEB
Leading Edge Blanking Time
Gate Driver Output ( GATE Pin )
VOL
Output Low Level
VOH
Output High Level
VG_Clamp Output Clamp Voltage Level
VCC=15V, Io=100mA
VCC=15V, Io=100mA
Vcc=18V
Tr
Rising Time
Tf
Falling Time
CL = 1nf
CL = 1nf
Frequency Setup (FR Pin)
RFR
Resistor Range
V_FR_open FR open voltage
Fburst Burst mode switching frequency
Fmax_QR_L Frequency low clamp in QR mode
Fmin_QR_H Frequency high clamp in QR mode
G_PFM PFM mode frequency modulation slope
ΔF(shiffle) /F Fmin_QR_L frequency shuffling range
TON
Maximum ON Time
RFR = 20 KΩ
Min. Typ. Max. Unit
5 15 uA
2.0 4.0 mA
3.0 5.0 mA
7.5
V
13.5
V
19
V
20
V
1.5
mA
5.3
V
0.8
V
0.7
V
4
KΩ
4.4
V
80
mS
75
mV
6
V
-0.7
V
2.5
uS
250
nS
3.75
V
0.415 0.45 0.485 V
0.8
V
0.3
V
300
nS
1V
7.5
V
16.5
80
nS
30
nS
20
KΩ
2.0
V
22
KHz
47 52 57 KHz
82 90 98 KHz
90
KHz
-4
+4 %
10 13 15 uS
2013/8/1 V3
Page 4