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參數(shù)資料
| 型號： | L6997 |
| 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 |
| 文件頁數(shù)： | 3/23頁 |
| 文件大?。?/td> | 291K |
| 代理商： | L6997 |
3/23
L6997
8
VFB
PWM comparator feedback input. Short this pin to INT pin when using the integrator function, or
to VSENSE pin without integrator.
Connect this pin to the input voltage through a voltage divider in order to provide the feed-
forward function. It cannot be left floating.
Soft start pin. A 5
μ
A constant current charges an external capacitor which value sets the soft-
start time.
An external resistor connected between this pin and GND sets the current limit threshold.
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. During the soft start and in case of output voltage fault it is low. It is pulled up
by external resistor.
Low Side driver ground.
Low Side driver output.
Low Side driver supply.
Return path of the High Side driver.
High side MOSFETS driver output.
Bootstrap capacitor pin. High Side driver is supplied through this pin.
9
OSC
10
SS
11
12
13
14
ILIM
SHDN
OVP
PGOOD
15
16
17
18
19
20
PGND
LGATE
V
DR
PHASE
HGATE
BOOT
ELECTRICAL CHARACTERISTICS
(V
CC
= V
DR
= 3.3V; T
amb
= 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
28
V
V
CC
,
V
DR
3
5.5
V
V
CC
Turn-onvoltage
2.86
2.97
V
Turn-off voltage
2.75
2.9
V
Hysteresis
90
mV
IqV
DR
Quiescent Current Drivers
VFB > VREF
7
20
μ
A
IqVcc
Device Quiescent current
VFB > VREF
400
600
μ
A
SHUTDOWN SECTION
SHDN
Device On
1.2
V
Device Off
0.6
V
I
SH
V
DR
Drivers shutdown current
SHDN to GND
5
μ
A
I
SH
V
CC
Devices shutdown current
SHDN to GND
1
15
μ
A
SOFT START SECTION
I
SS
Soft Start current
V
SS
= 0.4V
4
6
μ
A
Active Soft start and voltage
300
400
500
mV
CURRENT LIMIT AND ZERO CURRENT COMPARATOR
ILIM input bias current
R
ILIM
= 2K
to 200K
4.6
5
5.4
μ
A
Zero Crossing Comparator offset
Phase-gnd
-2
2
mV
DK
ILIM
Current limit factor
1.6
1.8
2
μ
A
PIN FUNCTION
(continued)
N°
Name
Description
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PDF描述 |
|---|---|
| L6997D | STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS |
| L6997DTR | STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6997-28 | 制造商:Johanson Manufacturing 功能描述:TUNING ELEMENT |
| L6997-5 | 制造商:Johanson Manufacturing 功能描述:TUNING ELEMENT; Accessory Type:Tuning Element; For Use With:High Quality Variable Reactance Tuning Microwave Cavities, Filters & other Resonant Structures |
| L6997-9 | 制造商:Johanson Manufacturing 功能描述:TUNING ELEMENT |
| L6997D | 功能描述:DC/DC 開關(guān)控制器 Adjustable Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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 |
| L6997DTR | 功能描述:DC/DC 開關(guān)控制器 Adjustable Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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 |
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