NCP1379 ON Semiconductor, NCP1379 Datasheet - Page 6

• Manufacturer Part Number: NCP1379
• Description: Quasi-Resonant Current-Mode Controller
• Manufacturer: ON Semiconductor

ELECTRICAL CHARACTERISTICS
V
FEEDBACK SECTION − FEEDBACK
PROTECTIONS − FAULT PROTECTION
3. Guaranteed by design
4. The peak current setpoint goes down as the load decreases. It is frozen below I
5. If negative voltage in excess to −300 mV is applied to ZCD pin, the current setpoint decrease is no longer guaranteed to be linear
6. Minimum value for T
V
R
T
t
CS
SHDN(HYS)
t
t
latch(delay)
Fault(clamp)
Fault(clamp)
Symbol
V
t
BO(delay)
V
OVLD(off)
T
SSTART
t
V
V
V
V
HVCOD
HVCOI
V
V
V
OVLD
V
SHDN
I
= 0 V, V
OVP
H2D
H3D
H4D
BO
H4I
H3I
H2I
BO
fault
Valley threshold
FB voltage where 1
starts
FB voltage where 2
starts
FB voltage where 3
starts
FB voltage where 4
FB voltage where VCO ends and 4
FB voltage where 4
starts
FB voltage where 3
starts
FB voltage where 2
starts
Thermal Shutdown
Thermal Shutdown Hysteresis
Overload Timer
OFF phase in auto−recovery fault mode
Soft−start duration
Brown−Out level
Sourced hysteresis current V
Delay before entering and exiting Brown−out
Internal Fault detection level for OVP
Delay before latch confirmation (OVP)
Clamped voltage (Fault pin left open)
Clamping resistor (Note 3)
= 1.5 V, C
J
= 125°C
T
= 680 pF) For min/max values T
st
nd
rd
th
th
rd
nd
Parameter
valley ends and 2
valley ends and 4
valley ends and VCO starts
valley ends and 3
valley ends and 2
valley ends and 3
valley ends and 1
(Unless otherwise noted: For typical values T
Fault
> V
th
valley starts
BO
nd
rd
th
nd
rd
st
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valley
valley
valley
valley
valley
valley
J
= −40°C to +125°C, Max T
6
DRV pulse to V
V
Device switching (F
V
up, measured from 1
FB
V
FB
V
Fault
V
around 65 kHz)
V
V
V
V
= 4 V, V
Fault
Fault pin open
V
V
V
V
= 4 V, V
Fault
90% of V
FB
FB
FB
FB
Conditions
FB
FB
FB
FB
= V
peak(VCO)
decreases
decreases
decreases
decreases
increases
increases
increases
increases
decreasing
increasing
BO
CS
J
CS
= 25°C, V
J
CS(peak)
ILIM
+ 0.2 V
= 150°C, V
ramping
> V
(I
peak
ILIM
SW
st
=
CC
= cst)
CC
= 12 V, V
1.316
1.128
0.846
0.732
1.316
1.504
1.692
1.880
0.744
22.5
2.35
22.5
1.30
= 12 V)
Min
140
1.0
2.8
1.0
75
−
9
ZCD
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0.800
30.0
1.55
Typ
1.4
1.2
0.9
0.8
1.4
1.6
1.8
2.0
1.2
3.8
2.5
1.2
40
85
10
30
−
= 0 V, V
1.484
1.272
0.954
0.828
1.484
1.696
1.908
2.120
0.856
Max
37.5
2.65
37.5
1.80
FB
170
1.4
4.8
1.4
95
11
−
= 3 V,
Unit
ms
ms
kW
mA
°C
°C
ms
ms
V
V
V
V
s