NCP1034
www.onsemi.com
5
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over V
CC
= 12 V,
DRVV
CC
= V
B
= 12 V, −40°C < TJ < 125°C)
Parameter Symbol Test Condition Min Typ Max Unit
REFERENCE VOLTAGE
Feedback Voltage
V
FB
1.25 V
Accuracy −40°C < TJ < 125°C −1.5 +1.5 %
FB Voltage Line Regulation L
REG
10 V < V
CC
< 18 V (Note 3) 2.0 mV
SUPPLY CURRENT
V
CC
Supply Current (Stat) I
CC(Static)
S
S
= 0 V, No Switching, R
T
= 10 k,
R
OCSET
= 10 k
2.0 3.0 mA
DRVV
CC
Supply Current (Stat) I
C(Static)
S
S
= 0 V, No Switching 0.1 0.3 mA
V
B
Supply Current (Stat) I
B(Static)
S
S
= 0 V, No Switching 0.1 0.3 mA
UNDERVOLTAGE LOCKOUT
V
CC
−Start−Threshold V
CC_UVLO
(R) Supply Ramping Up 7.9 8.9 9.8 V
V
CC
−Stop−Threshold V
CC_UVLO
(F) Supply Ramping Down 7.3 8.2 9.0 V
V
CC
−Hysteresis Supply Ramping Up and Down 0.7 V
DRV
CC
−Start−Threshold DRV
CC_UVLO
(R) Supply Ramping Up 7.9 8.9 9.8 V
DRV
CC
−Stop−Threshold DRV
CC_UVLO
(F) Supply Ramping Down 7.3 8.2 9.0 V
DRV
CC
−Hysteresis Supply Ramping Up and Down 0.7 V
V
B
−Start−Threshold V
B_UVLO
(R) Supply Ramping Up 7.9 8.9 9.8 V
V
B
−Stop−Threshold V
B_UVLO
(F) Supply Ramping Down 7.3 8.2 9.0 V
V
B
−Hysteresis Supply Ramping Up and Down 0.7 V
Undervoltage Threshold Value U
UVLO
(Rising) 1.19 1.25 1.31 V
Undervoltage Threshold Value U
UVLO
(Falling) 1.10 1.15 1.20 V
OSCILLATOR
Frequency
F
S
R
T
= 20 k
R
T
= 10 k
170
320
200
375
230
430
kHz
Ramp Amplitude V
ramp
(Note 3) 2.0 V
Min Duty Cycle D
min
FB = 2 V 0 %
Min Pulse Width D
min(ctrl)
F
S
= 200 kHz, (Note 3) 200 ns
Max Duty Cycle D
max
F
S
= 400 kHz, FB = 1.2 V 80 %
SYNC Frequency Range SYNC(F
S
) 20% Above Free Running
Frequency
500 kHz
SYNC Pulse Duration SYNC
(pulse)
200 ns
SYNC High Level SYNC
(H)
2.0 V
SYNC Low Level SYNC
(L)
0.8 V
SYNC Input Threshold SYNC
(Thre)
1.6 V
SYNC Input Hysteresis SYNC
(Hyst)
300 mV
SYNC Input Impedance SYNC
(ZIN)
(Note 3) 16
k
SYNC Output Impedance SYNC
(OUT)
(Note 3) 2.5
k
SYNC Output Pulse Width SYNC
(Pulse
Width)
F
S
= 500 kHz, (Note 3) 300 ns
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.
2. Cold temperature performance is guaranteed via correlation using statistical quality control. Not tested in production.
3. Guaranteed by design but not tested in production.
