NCV887200
www.onsemi.com
4
ELECTRICAL CHARACTERISTICS (−40°C < T
J
< 150°C, 4.8 V < V
IN
< 40 V, unless otherwise specified) Min/Max values are
guaranteed by test, design or statistical correlation.
Characteristic
Symbol Conditions Min Typ Max Unit
GENERAL
Quiescent Current, Sleep Mode
I
q,sleep
V
IN
= 13.2 V, EN = 0, T
J
= 25°C − 2.0 −
mA
Quiescent Current, Sleep Mode I
q,sleep
V
IN
= 13.2 V, EN = 0, −40°C < T
J
< 125°C − 2.0 6.0
mA
Quiescent Current, No switching I
q,off
Into VIN pin, EN = 1, No switching − 1.5 2.5 mA
Quiescent Current, Switching,
Normal Operation
I
q,on
Into VIN pin, EN = 1, Switching − 3.0 6.0 mA
OSCILLATOR
Minimum Pulse Width
t
on,min
90 115 140 ns
Maximum Duty Cycle D
max
91 92 93.5 %
Switching Frequency f
s
608 675 742 kHz
Soft−Start Time t
ss
From start of switching with V
FB
= 0 until ref-
erence voltage = V
REF
1.55 1.90 2.25 ms
Soft−Start Delay t
ss,dly
From EN → 1 until start of switching with
V
FB
= 0 with V
C
pin compensation network
disconnected
− 200 280
ms
Slope Compensating Ramp S
a
30 34 38
mV/ms
ENABLE/SYNCHRONIZATION
EN/SYNC Pull−Down Current
I
EN/SYNC
V
EN/SYNC
= 5 V − 5.0 10
mA
EN/SYNC Input High Voltage V
s,ih
2.0 − 5.0 V
EN/SYNC Input Low Voltage V
s,il
0 − 800 mV
EN/SYNC Time−Out Ratio %t
en
From SYNC falling edge, to oscillator control
(EN high) or shutdown (EN low), Percent of
typical switching period
− − 350 %
SYNC Minimum Frequency Ratio %f
sync,min
Percent of f
s
− − 80 %
SYNC Maximum Frequency f
sync,max
1.1 − − MHz
Synchronization Delay t
s,dly
From SYNC falling edge to GDRV falling
edge under open loop conditions
− 50 100 ns
Synchronization Duty Cycle D
sync
25 − 75 %
CURRENT SENSE AMPLIFIER
Low−Frequency Gain
A
csa
Input−to−output gain at dc, ISNS v 1 V 0.9 1.0 1.1 V/V
Bandwidth BW
csa
Gain of A
csa
− 3 dB 2.5 − − MHz
ISNS Input Bias Current I
sns,bias
Out of ISNS pin − 30 50
mA
Current Limit Threshold Voltage V
cl
Voltage on ISNS pin 180 200 220 mV
Current Limit, Response Time t
cl
CL tripped until GDRV falling edge,
V
ISNS
= V
cl
(typ) + 60 mV
− 80 125 ns
Overcurrent Protection,
Threshold Voltage
%V
ocp
Percent of V
cl
125 150 175 %
Overcurrent Protection,
Response Time
t
ocp
From overcurrent event, Until switching
stops, V
ISNS
= V
OCP
+ 40 mV
− − 125 ns
VOLTAGE ERROR OPERATIONAL TRANSCONDUCTANCE AMPLIFIER
Transconductance
g
m,vea
V
FB
– V
ref
= ± 20 mV 0.8 1.2 1.63 mS
VEA Output Resistance R
o,vea
2.0 − −
MW
VFB Input Bias Current I
vfb,bias
Current out of VFB pin − 0.5 2.0
mA
Reference Voltage V
ref
1.176 1.200 1.224 V
VEA Maximum Output Voltage V
c,max
2.5 − − V
