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UPD166009T1F-E1-AY

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27
Data Sheet S19688EJ2V0DS
8
μ
PD166009
IIN
V
OUT
IL
0
0
0
t
IIS
0
Von
(
CL
)
ESD
IS
V
CC
Ris
OUT
Control
L
og
i
c
SW1
V
CC
Switching an inductive load
Dynamic clamp operation at inductive load switch off
The dynamic clamp circuit works only when the inductive load is switched off. When the inductive load is switched
off, the voltage of OUT falls below 0 V. The gate voltage of SW1 is then nearly equal to GND because the IS terminal
is connected to GND via an external resister. Next, the voltage at the source of SW1 (= gate of output MOS) falls
below the GND voltage. SW1 is turned on, and the clamp diode is connected to the gate of the output MOS, activating
the dynamic clamp circuit.
When the over-voltage is applied to VCC, the gate voltage and source voltage of SW1 are both nearly equal to GND.
SW1 is not turned on, the clamp diode is not connected to the gate of the output MOS, and the dynamic clamp circuit
is not activated.
Data Sheet S19688EJ2V0DS
9
μ
PD166009
VOUT/VCC
VBAT
IIN
I
L
IL(SC)
0
0
V
ON
0
t
IIS
IIS
,
fault
0
tsdela
y(
fault
)
VCC
VOUT
Short circuit detection
Depending on the external impedance
(Evaluation circuit)
R
L
VCC
IN
OUT
IS
RIS
IL
IIS
IIN
VOUT
VIS
Von
VBAT
VIN
: Cable impedance
Short circuit protection
Case 1: IN pin is shorted to ground in an overload condition, which includes a short circuit condition.
The device shuts down automatically when either or both of following conditions (a, b) is detected.
The sense current is fixed at I
IS,fault. Shutdown is latched until the next reset via input.
(a) I
L > IL(sc)
(b) Von > V
on(OvL) after td(OC)
Case1-(a) IL > IL(sc)
Typical Short circuit detection current characteristics
The short circuit detection current changes according V
CC voltage and Von voltage for the purpose of to be strength
of the robustness under short circuit condition.
0
20
40
60
80
100
120
140
160
0 5 10 15 20
Von [V]
I
L(SC)
[A]
V
CC
-V
IN
=18V
V
CC
-V
IN
=12V
V
CC
-V
IN
=6V
0
30
60
90
120
150
5 101520
V
CC
-V
IN
[V]
IL(SC) [A]
Von=3V
Von=6V
Von=12V
t
sdelay(fault): Fault sense signal delay after short circuit detection
IL(SC): Short circuit detection current
I
L(SC) vs. VCC − VIN
Data Sheet S19688EJ2V0DS
10
μ
PD166009
Case1-(b) Von > Von(OvL) after td(OC)
t
d(oc): Turn-on check delay after input current positive slope
(Evaluation circuit)
R
L
VCC
IN
OUT
IS
RIS
IL
IIS
IIN
VOUT
VIS
Von
VBAT
VIN
: Cable impedance
VBAT
IIN
V
OUT/VCC
IL
IL(SC)
0
0
V
ON
0
t
IIS
IIS
,
fault
0
td
oc
VCC
VOUT
Short circuit detection
Von
(
OvL
)
Depending on the external impedance
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27

UPD166009T1F-E1-AY

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Description:
MOSFET N-CH TO252
Lifecycle:
New from this manufacturer.
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