SP6878
Quasi-Resonant PWM Controller
ELECTRICAL CHARACTERISTICS
(T
A
=25
℃
, V
CC
=16V, R
FR
=
20K Ohm unless otherwise specified.)
Symbol
Parameter
Conditions
Supply Voltage ( Vcc Pin )
I
stt
Startup Current
Vcc=UVLO-1.5V
V
FB
= 3V
I
op
Operating Current
V
FB
= 3V, C
L
= 1nf
UVLO
(off)
Min. Operating Voltage
UVLO
(on )
Start Threshold Voltage
OVP Level Over Voltage Protection
Vcc Clamp Clamping Voltage
I
VCC
= 5mA
Voltage Feedback ( FB Pin )
Isc
Short Circuit Current
Vop
Open Loop Voltage
V
TH_BM_on
Burst Mode on threshold
V
TH_BM_off
Burst Mode off threshold
Z
FB
Input Impedance
TL
OLP
OLP Trip Level
TD
OLP
OLP Delay Time (note)
Demagnetization ( DEM Pin )
V
TH(DEM)
Demagnetization Threshold Voltage
VC
H
Input Clamp Voltage High
VC
L
Input Clamp Voltage Low
Suppression of the transformer ringing
Tsupp
at start of secondary stoke
T
DEM
Demag Propagation Delay
V
TH_
OVP Output OVP trigger point
Current Sensing ( CS Pin )
V
TH_
Internal current limiting threshold
Zero duty cycle, V
FB
=3V
Duty_zero
V
TH_
Internal current limiting threshold
Max duty cycle, V
FB
=3V
Duty_max
V
TH_
CS_min Burst mode CS threshold
Zero Output, V
FB
=1V
T
LEB
Leading Edge Blanking Time
Gate Driver Output ( GATE Pin )
V
OL
Output Low Level
V
CC
=15V, Io=100mA
V
OH
Output High Level
V
CC
=15V, Io=100mA
VG_Clamp Output Clamp Voltage Level
Vcc=18V
Tr
Rising Time
C
L
= 1nf
Tf
Falling Time
C
L
= 1nf
Frequency Setup (FR Pin)
R
FR
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
R
FR
= 20 KΩ
T
ON
Maximum ON Time
2013/8/1
Min.
Typ. Max. Unit
5
2.0
3.0
7.5
13.5
19
20
1.5
5.3
0.8
0.7
4
4.4
80
75
6
-0.7
2.5
250
3.75
15
4.0
5.0
uA
mA
mA
V
V
V
V
mA
V
V
V
KΩ
V
mS
mV
V
V
uS
nS
V
0.415
0.45 0.485 V
0.8
0.3
300
1
V
V
nS
V
V
nS
nS
KΩ
V
KHz
57 KHz
98 KHz
KHz
+4
%
15 uS
Page 4
7.5
16.5
80
30
20
2.0
22
52
90
90
13
47
82
-4
10
V3
SYNC-POWER [ SYNC POWER CROP. ]
