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L6995S Scheda tecnica(PDF) 3 Page - STMicroelectronics

Il numero della parte L6995S
Spiegazioni elettronici  LOSSLESS CURRENT LIMIT
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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L6995S
5VCC
IC Supply Voltage.
6
GND
Signal ground
7
VREF
0.9 V voltage reference. Connect max. a 10nF ceramic capacitor between this pin and ground.
This pin is capable to source or sink up to 250uA
8
VFB
PWM comparator feedback input. Short this pin to INT pin when using the integrator function, or
to VSENSE pin without integrator.
9
OSC
Connect this pin to the input voltage through a voltage divider in order to provide the feed-
forward function. It cannot be left floating.
10
SS
Soft start pin. A 5
µA constant current charges an external capacitor which value sets the soft-
start time.
11
ILIM
An external resistor connected between this pin and GND sets the current limit threshold.
12
SHDN
Shutdown. When connected to GND the device and the drivers are OFF. It cannot be left floating.
13
OVP
Open drain output. During the over voltage condition it is pulled up by an external resistor.
14
PGOOD
Open drain output. During the soft start and in case of output voltage fault it is low. It is pulled up
by external resistor.
15
PGND
Low Side driver ground.
16
LGATE
Low Side driver output.
17
VDR
Low Side driver supply.
18
PHASE
Return path of the High Side driver.
19
HGATE
High side MOSFETS driver output.
20
BOOT
Bootstrap capacitor pin. High Side driver is supplied through this pin.
Table 5. Electrical Characteristics
(VCC = VDR = 5V; Tamb = 0°C to 85°C unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
SUPPLY SECTION
Vin
Input voltage range
Vout=Vref Fsw=110Khz Iout=1A
1.5
35
V
VCC,
VDR
4.5
5.5
V
VCC
Turn-onvoltage
4.2
4.4
V
Turn-off voltage
4.1
4.3
V
Hysteresis
100
mV
IqVDR
Quiescent Current Drivers
VFB > VREF
20
µA
IqVcc
Device Quiescent current
VFB > VREF
400
600
µA
SHUTDOWN SECTION
SHDN
Device On
1.2
V
Device Off
0.6
V
ISHVDR
Drivers shutdown current
SHDN to GND
5
µA
ISHVCC
Devices shutdown current
SHDN to GND
10
15
µA
SOFT START SECTION
ISS
Soft Start current
VSS = 0.8V
4
6
µA
SS Clamp Voltage
4
V
Soft start active range
400
450
500
mV
Table 4. Pin Function (continued)
Name
Description


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