NCP1399AA, NCP1399BA, NCP1399AC
ELECTRICAL CHARACTERISTICS
(For typical values T = 25°C, for min/max values T = −40°C to +125°C, V = 12 V unless otherwise noted.)
J
J
CC
Symbol
Current Sense Input Section
On−time comparator delay to Mupper driver turn off
Rating
Pin
Min
Typ
Max
Unit
t
5, 6
−
−
250
ns
pd_CS
V
FB
= 2.5 V, V goes up from –2.5 V to 2.5 V with rising
CS
edge of 100 ns
I
Current sense input leakage current for V
=
CS
3 V
6
6
−
−
1
mA
mV
ns
CS_LEAKAGE
V
Current sense input offset voltage
160
360
200
440
240
540
CS_OFFSET
t
Leading edge blanking time of the on−time comparator output
5, 6, 14
LEB
Faults and Auto−Recovery Timer
t
FB fault timer duration (NCP1399AA, NCP1399BA)
FB fault timer duration (NCP1399AC)
−
−
−
5
−
6
−
160
80
−
200
100
1000
4.7
5
240
120
−
ms
ms
−
FB_FAULT_TIMER
N
Number of DRV pulses to confirm FB fault
FB voltage when FB fault is detected
FB_FAULT_COUNTER
V
4.5
−
4.9
−
V
FB_FAULT
CS_FAULT_COUNTER
N
Number of CS_fault cmp. pulses to confirm CS fault
CS voltage when CS fault is detected
−
V
2.5
0.8
2.7
1
2.9
1.2
V
CS_FAULT
A−REC_TIMER
t
Auto−recovery duration (common timer for all fault condition)
s
Brown−Out Protection
V
Brown−out turn−off threshold
3
3
3
3
3
0.965
4.3
5
1.000
5.0
12
1.035
5.4
V
BO
I
Brown−out hysteresis current, V
< V
mA
mV
mA
ms
BO
VBULK/PFC_FB
BO
V
Brown*Out comparator hysteresis
Brown*Out input bias current
BO filter duration
25
BO_HYST
BO_BIAS
I
−
−
0.05
30
t
10
20
BO_FILTR
Ramp Compensation
RC
Ramp compensation gain
−
−
58
−
82
0
108
−
mV/ms
ms
GAIN
t
Ramp compensation time shift
RC_SHIFT
Temperature Shutdown Protection
T
TSD
Temperature shutdown T going up (NCP1399AA,
NCP1399BA)
−
−
124
−
°C
J
Temperature shutdown T going up (NCP1399AC)
−
−
−
−
137
30
−
−
°C
°C
J
T
Temperature shutdown hysteresis
TSD_HYST
2. The NCP1399Ay version has skip adjustable externally.
3. Guaranteed by design.
4. Minimal impedance on P ON/OFF pin is 1 kW
5. Minimal resistance connected in series with bootstrap diode is 3.3 W
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
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