L9821 데이터 시트보기 (PDF) - STMicroelectronics
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L9821 Datasheet PDF : 7 Pages
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L9821
PIN FUNCTIONS
1. POWER SUPPLY
Supply voltage input. When the supply reaches the
maximum operating voltage (32V) the device is tur-
ned off, protecting itself and the load.
Turning off guaranteed for VS > 41V.
2. INPUT
TTL compatible input. High level on this pin means
outputcurrentON. Thelow level voltageswitches off
the charge pump, the power stage and the diagno-
stic output reducing to the minimum value the quie-
scent current.
3. GROUND
This pin must be connected to ground.
4. DIAGNOSTIC FEEDBACK
The diagnostic circuit is active in input high level
condition. This output detects with Tipically 45ms
delay at Tamb = 25°C the following faults :
- Overvoltage condition.
- Thermal shutdown.
- Short circuit. The powerstagecurrentis internally
limited at 25A.
- Open load. The open load condition is detected
with load current < 0.6A.
The diagnostic output is active low. The diagnostic
delay time allows to avoid spurious diagnosys (i.e :
turn ON overcurrent, overvoltage spikes etc.).
5. POWER OUTPUT
The device is provided with short circuit protection
at Vs ≤ 14.4V
ELECTRICAL CHARACTERISTICS (VS = 14.4V; -40°C ≤ Tj ≤ 125°C, unless otherwise specified)
Symbol
VOP
RON
ISC
IDL
IOPD
Vclamp
IOff
ION
VIL
VIH
II
ILEAKD
VSATD
TDd
tdON
tr
tdOFF
tf
Parameter
Operat. Voltage
On Resistance
Short circuit current
Over Current Detection Level
Open Load Detection Level
Output Under Voltage Clamping
Off State Supply Current
ON State Supply Current
Input Low Level
Input High Level
Input Current
Diagnostic Output Leakage
Voltage
Diagnostic Output Saturation
Voltage
Diagnostic Delay Time
Output ON Delay Time
Output ON Rise Time
Output OFF Delay Time
Output OFF Fall Time
Test Condition
Input >2V:Tj = 25°C
Input >2V:Full T range
Device ON
Iload <6A Inductive
Tj = -40 to 35°C
Tj = 35 to 85°C
Tj = 25°C
Vi = Vthreshold
VCC = 5V
Diagnostic Output
Isink <1.6mA
Tj = 25°C;
Tj = 25°C
Tj = 25°C
Tj = 25°C
Tj = 25°C
Min.
6
-12
2.0
Typ.
0.1
25
20
10
Max.
32
0.2
1.2
-4
100
300
0.8
15
10
Unit
V
Ω
A
A
A
V
µA
µA
mA
V
V
µA
µA
0.4
V
45
ms
15
µs
65
µs
50
µs
100
µs
3/7
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