NCV8851
http://onsemi.com
5
ELECTRICAL CHARACTERISTICS
(−40°C < T
J
< 150°C, 4.5 V < V
IN
< 20 V, 4.5 V < BST < 46 V, R
OSC
= 51.1 kW, unless otherwise specified)
Characteristic UnitMaxTypMinConditions
CURRENT ERROR AMPLIFIER
DC Gain
Guaranteed by Design 70 73 − dB
Gain−Bandwidth Product Guaranteed by Design 8.0 10 − MHz
Charge Currents
Source, C
COMP
= 1.75 V 2 4 − mA
Sink, C
COMP
= 1.75 V 1.3 3 − mA
FB Bias Current Guaranteed by Design − 0.1 1.0
mA
Clamping Voltage 2.7 3.5 − V
CURRENT LIMIT
Average Current Limit Threshold
1.2 V ≤ CSN ≤ 10.0 V 80 100 125 mV
Cycle−by−Cycle Current Limit
Threshold Voltage
115 165 215 mV
Cycle−by−Cycle Current Limit
Response Time
Guaranteed by Design − 200 − ns
Cycle−by−Cycle and Average Cur-
rent Limit Threshold Difference
20 − − mV
SYNC
SYNC Frequency Range
F
SW
− 600 kHz
SYNC Pin Bias Current V
SYNC
= 0 V
V
SYNC
= 5.0 V
−
−
0.1
10
0.2
20
mA
SYNC Threshold Voltage Logic Low
Logic High
−
2.0
−
−
0.8
−
V
6.0 V LDO
Output Voltage
I
OUT
= 20 mA 5.8 6.0 6.2 V
Dropout Voltage I
OUT
= 20 mA − − 200 mV
Current Limit 30 75 120 mA
GATE DRIVERS
GH Sink Current
V
GH
= 2 V, V
IN_IC
= 6 V, Guaranteed by Design
V
GH
= 4 V, V
IN_IC
= 6 V, Guaranteed by Design
− 1.5 − A
GH Source Current − 1.5 − A
GL Sink Current
V
IN_IC
= 6 V
V
GL
= 1.0 V
Guaranteed by Design
− 1.5 − A
GL Source Current − 1.5 − A
GH to GL Delay V
IN
= 13.2 V − 40 70 ns
GL to GH Delay V
IN
= 13.2 V − 40 70 ns
SOFT START
Time
F
SW
= 170 kHz − 14 − ms
ENABLE (EN)
Input Threshold
Logic Low
Logic High
−
2.0
−
−
0.8
−
V
Input Current EN = 2.0 V − 3.0 10
mA
