FAN6248HC/HD/LC/LD
www.onsemi.com
6
ELECTRICAL CHARACTERISTICS (V
DD
= 12 V and T
J
= −40°C to +125°C unless otherwise specified) (continued)
Symbol UnitMaxTypMinConditionsParameter
MINIMUM ON-TIME AND MAXIMUM ON-TIME
t
ON_MIN_LL
*
Minimum On-Time Lower Limit
for LC and LD version
t
ON_MIN_LL
< t
ON_MIN
<
t
ON_MIN_UL
0.4
ms
t
ON_MIN_UL
Minimum On-Time Upper Limit
for LD and LD version
3.2 4 4.8
ms
t
SR_CNDT_H
Minimum SR Conduction Time to
enable SR for HC and HD version
The duration from turn-on trigger
to V
DS
rising above V
TH_HGH
380 600 820 ns
t
SR_CNDT_L
Minimum SR Conduction Time to
enable SR for LC and LD version
The duration from turn-on trigger
to V
DS
rising above V
TH_HGH
0.85 1.2 1.65
ms
t
SR_MAX_H
*
Maximum SR Turn-on Time
for HC and HD version
15
ms
t
SR_MAX_L
*
Maximum SR Turn-on Time
for LC and LD version
30
ms
REGULATED DEAD TIME
t
DEAD_H
*
Dead time regulation target
for HC and HD version
From V
GATE
falling below V
G_LW
to V
DS
rising above V
TH_HGH
280 ns
t
DEAD_H_LIGHT
*
Dead time regulation target under
light load condition for HC and HD
version
From V
GATE
falling below V
G_LW
to V
DS
rising above V
TH_HGH
320 ns
t
DEAD_L
*
Dead time regulation target
for LC and LD version
From V
GATE
falling below V
G_LW
to V
DS
rising above V
TH_HGH
320 ns
t
DEAD_L_LIGHT
*
Dead time regulation target under
light load condition for LC and LD
version
From V
GATE
falling below V
G_LW
to V
DS
rising above V
TH_HGH
360 ns
t
TSDT
*
Too small dead time threshold to
speed up I
OFFSET
change
(Speed up 2 times)
From V
GATE
falling below V
G_LW
to V
DS
rising above V
TH_HGH
50 ns
K
INV
*
Adaptive SR current inversion
detection time Ratio between T
INV
and SR conduction time of previous
switching cycle
V
GATE
> V
G_HG
and V
DS
>
V
TH_OFF
K
INV
= 0.25 × K
TON
6.25 %
h
INV_EXT
*
Normal switching cycles without
capacitive current spike to exit SR
current inversion detection state
which has t
ON_DLY2
31 cycle
GREEN MODE CONTROL
t
GRN_ENT_H
Non-Switching Period to Enter Green
Mode for HC and HD version
Non switching cycles between
burst switching bundles
60 80 100
ms
t
GRN_ENT_L
Non-Switching Period to Enter Green
Mode for LC and LD version
Non switching cycles between
burst switching bundles
120 160 200
ms
t
GRN_ENT_DBNC_H
De-bounce time to Enter Green Mode
for HC and HD version
De-bounce time after t
GRN.ENT_H
130 180 230
ms
t
GRN_ENT_DBNC_L
De-bounce time to Enter Green Mode
for LC and LD version
De-bounce time after t
GRN_ENT_L
240 320 400
ms
t
GRN_EXT_H
Non-Switching Period to Exit Green
for HC and HD version
Non switching cycles between
burst switching bundles
30 40 50
ms
t
GRN_EXT_L
Non-Switching Period to Exit Green
Mode for LC and LD version
Non switching cycles between
burst switching bundles
60 80 100
ms
h
CSW_EXT
Continuous switching cycles to exit
Green Mode for HC, HD, LC and LD
version
4 7 10 cycle