NCP1562A, NCP1562B
http://onsemi.com
7
ELECTRICAL CHARACTERISTICS (continued) (V
in
=48V,V
AUX
=12V,V
UVOV
=2.3V,V
EA
= open, V
CSKIP
=0V,
V
CS
=0V,V
SS
= open, R
T
= 13.3 kΩ,C
AUX
=10mF, C
T
= 470 pF, C
out1
=C
out2
= 100 pF, C
UVOV
=0.01mF, C
CSKIP
= 6800 pF,
R
D
=25kΩ,R
SYNC
=5.0kΩ,C
REF
=0.1mF, R
FF
= 29.4 kΩ,C
FF
= 470 pF. For typical values T
J
=25C, for min/max values, T
J
is – 40Cto
125C, unless otherwise noted.)
Characteristic
Symbol Min Typ Max Unit
CURRENT LIMIT AND THERMAL SHUTDOWN
Cycle–by–Cycle Threshold Voltage (V
out
=10V)
NCP1562A
NCP1562B
V
ILIM
191
472
203
495
217
512
mV
Propagation Delay to Output
(V
CS
=V
ILIM
to 1.0 V, LEB Disabled, V
out
=10V)
T
J
=25_C
T
J
= –40_C to 125_C
t
ILIM
–
–
78
–
90
110
ns
Thermal Shutdown Threshold (Junction Temperature Increasing, Note 4) T
SHDN
– 160 – _C
Thermal Shutdown Hysteresis (Temperature Decreasing, Note 4) T
H
– 25 – _C
LEADING EDGE BLANKING
Offset V oltage
V
LEB(offset)
– 10 – mV
Blanking Time t
LEB
50 80 110 ns
V
EA
Threshold the Disables LEB (Measured together with t
LEB
) V
LEB(dis)
4.1 – – V
CYCLE SKIP CURRENT LIMIT MODE
Charge Current (V
CSKIP
=1.25V) I
CSKIP(C)
70 90 111 mA
Discharge Current (V
CSKIP
=1.25V) I
CSKIP(D)
6.5 8.6 11 mA
Number of Pulses to Exit Cycle Skip Mode Pulse
CSKIP
– 3 – --
Upper Threshold Voltage (Ramp up V
CSKIP
,V
CS
=1.0V) V
CSKIP(peak)
2.83 3.03 3.24 V
Lower Threshold Voltage (Ramp down V
CSKIP
) V
CSKIP(valley)
0.39 0.465 0.52 V
Threshold V oltage Hysteresis V
CSKIP(H)
– 2.5 – V
5.0 V REFERENCE
Output V oltage (I
REF
=0mA) V
REF
4.9 5.0 5.1 V
Load Regulation (I
REF
=0to5.0mA) V
REF(Load)
– 16 50 mV
Line Regulation (V
AUX
= 7.5 to 20 V, I
REF
=0mA) V
REF(line)
– 10 50 mV
Discharge Current (V
UVOV
=0V,V
REF
=2.5V) I
REF(D)
3.8 – – mA
OSCILLATOR
Frequency
T
J
=25_C
T
J
=--40_C to 125_C
f
OSC
222
211.2
246
–
272.2
277.2
kHz
Peak V oltage V
RTCT(peak)
-- 2.95 -- V
Valley Voltage V
RTCT(valley)
-- 2.1 -- V
Discharge Current (V
RTCT
=2.3V) I
RTCT
-- 490 -- mA
Maximum Operating Frequency (Note 4) f
MAX
1.0 – – MHz
Duty Cycle (R
D
=25kΩ) D 58.5 62.0 64.7 %
Adjustable Maximum Duty Cycle (Note 4) D
MAX
85 -- -- %
4. Guaranteed by design only .
