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L7987L 数据表(PDF) 8 Page - STMicroelectronics

部件名 L7987L
功能描述  Adjustable current limitation
PDF  41 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L7987L 数据表(HTML) 8 Page - STMicroelectronics

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Electrical characteristics
L7987L
8/41
DocID026362 Rev 3
3
Electrical characteristics
All the population tested at TJ = 25 °C, VIN = VCC = 24 V and VEN = 3 V unless otherwise
specified.
Table 5. Electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ.
Max. Unit
VIN
Operating input voltage
range
(1)
4.5
61
V
RDSON HS High-side RDSON
ISW = 0.5 A
0.30
0.48
ISW = 0.5 A
(1)
0.30
0.57
fSW
Switching frequency
FSW floating
233
250
267
kHz
FSW floating
(1)
225
250
275
kHz
Selected switching
frequency
RFSW = 10 k
1350 1500 1650 kHz
IPK
Peak current limit
RILIM = 27 k; VFB = 0.6 V
(2)
2.65
3.05
3.45
A
Selected peak current limit
RILIM = 100 k; VFB = 0.6 V
(2)
0.68
0.85
1.01
A
ISKIP
Pulse skipping peak current
(2)
0.5
A
VFOLD
Feedback foldback level
(3)
400
mV
TONMAX Maximum On time
12
µs
TONMIN Minimum On time
120
150
ns
TOFFMIN Minimum Off time
(3)
360
ns
VCC / VBIAS
VCCH
VCC UVLO rising threshold
(1)
3.85
4.10
4.30
V
VCCHYST VCC UVLO hysteresis
(1)
160
250
340
mV
SWO
VBIAS threshold
Switch internal supply from VCC to VBIAS.
VBIAS ramping up from 0 V.
(1)
2.84
2.90
2.96
V
Hysteresis
(3)
80
mV
VCC - VBIAS threshold
Switch internal supply from VCC to VBIAS.
VIN = VCC = 24 V, VBIAS falling from 24 V
to GND.
(1)
3.35
4.05
4.90
V
Hysteresis
(3)
750
mV
Power consumption
ISHTDWN Shutdown current from VIN
VEN = GND
11
16
µA
IQUIESC
Quiescent current from VIN
and VCC
LX floating, VFB = 1 V, VBIAS = GND,
FSW floating
2.5
3.4
mA
IQOPVIN
Quiescent current from VIN
and VCC
LX floating, VFB = 1 V, VBIAS = 3.3 V,
FSW floating
1.0
1.4
mA
IQOPVBIAS
Quiescent current from
VBIAS
1.6
2.4
mA



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