參數(shù)資料
型號(hào)： L6997S
廠商： 意法半導(dǎo)體
英文描述： STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS
中文描述： 降壓控制器低電壓運(yùn)作
文件頁(yè)數(shù)： 3/30頁(yè)
文件大?。?/td> 515K
代理商： L6997S
3/30
L6997S
5
6
7
V
CC
GND
VREF
IC Supply Voltage.
Signal ground
0.6V voltage reference. Connect a ceramic capacitor (max. 10nF) between this pin and
ground. This pin is capable to source or sink up to 250uA
PWM comparator feedback input. Short this pin to INT pin to enable the integrator function, or
to VSENSE to disable the integrator function.
Connect this pin to the input voltage through a voltage divider in order to provide the feed-
forward function don’t leave floating.
Soft Start pin. A 5
μ
A constant current charges an external capacitor. Itsvalue sets the soft-
start time don’t leave floating.
An external resistor connected between this pin and GND sets the current limit threshold don’t
leave floating..
Shutdown. When connected to GND the device and the drivers are OFF. It cannot be left
floating.
Open drain output. During the over voltage condition it is pulled up by an external resistor.
Open drain output. It is pulled down when the output voltage is not within the specified
thresholds. Otherwise is pulled up by external resistor. If not used it can be left floating.
Low Side driver ground.
Low Side driver output.
Low Side driver supply.
8
VFB
9
OSC
10
SS
11
ILIM
12
SHDN
13
14
OVP
PGOOD
15
16
17
PGND
LGATE
V
DR
PHASE
HGATE
BOOT
18
19
20
Return path of the High Side driver.
High side driver output.
Bootstrap capacitor pin. High Side driver is supplied through this pin.
Table 5. Electrical Characteristics
(V
CC
= V
DR
= 3.3V; T
amb
= 0°C to 85°C unless otherwise specified)
Symbol
Parameter
SUPPLY SECTION
Vin
Input voltage range
V
CC
,
V
DR
V
CC
Turn-onvoltage
Turn-off voltage
Hysteresis
IqV
DR
Drivers Quiescent Current
IqVcc
Device Quiescent current
SHUTDOWN SECTION
SHDN
Device On
Device Off
I
SH
V
DR
Drivers shutdown current
I
SH
V
CC
Devices shutdown current
SOFT START SECTION
I
SS
Soft Start current
V
SS
Active Soft start and voltage
Test Condition
Min.
Typ.
Max.
Unit
Vout=Vref Fsw=110Khz Iout=1A
1
3
35
5.5
V
V
2.86
2.75
2.97
2.9
V
V
90
7
400
mV
μ
A
μ
A
VFB > VREF
VFB > VREF
20
600
1.2
V
V
μ
A
μ
A
0.6
5
15
SHDN to GND
SHDN to GND
1
V
SS
= 0.4V
4
6
μ
A
mV
300
400
500
Table 4. Pin Function
(continued)
N°
Name
Description
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6997STR 功能描述:DC/DC 開(kāi)關(guān)控制器 3.0 to 5.5V Step-Dwn RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
L6998-0 制造商:Johanson Manufacturing 功能描述:TUNING ELEMENT
L6998-1 制造商:Johanson Manufacturing 功能描述:TUNING ELEMENT
L6998-5 制造商:Johanson Manufacturing 功能描述:TUNING ELEMENT
L6998-6 制造商:Johanson Manufacturing 功能描述:TUNING ELEMENT
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