參數(shù)資料
型號： L6997D
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PDSO20
封裝： MO-153AC, TSSOP-20
文件頁數(shù)： 23/30頁
文件大?。?/td> 591K
代理商： L6997D
Obsolete
Product(s)
- Obsolete
Product(s)
3/30
L6997
8
VFB
PWM comparator feedback input. Short this pin to INT pin to enable the integrator function, or
to VSENSE to disable the integrator function.
9
OSC
Connect this pin to the input voltage through a voltage divider in order to provide the feed-
forward function don’t leave floating.
10
SS
Soft Start pin. A 5
A constant current charges an external capacitor. Itsvalue sets the soft-
start time don’t leave floating.
11
ILIM
An external resistor connected between this pin and GND sets the current limit threshold don’t
leave floating..
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. 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.
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 driver output.
20
BOOT
Bootstrap capacitor pin. High Side driver is supplied through this pin.
Table 5. Electrical Characteristics
(VCC = VDR = 3.3V; 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
28
V
VCC,
VDR
35.5
V
VCC
Turn-onvoltage
2.86
2.97
V
Turn-off voltage
2.75
2.9
V
Hysteresis
90
mV
IqVDR
Drivers Quiescent Current
VFB > VREF
7
20
A
IqVcc
Device Quiescent current
VFB > VREF
400
600
A
SHUTDOWN SECTION
SHDN
Device On
1.2
V
Device Off
0.6
V
ISHVDR
Drivers shutdown current
SHDN to GND
5
A
ISHVCC
Devices shutdown current
SHDN to GND
1
15
A
SOFT START SECTION
ISS
Soft Start current
VSS = 0.4V
4
6
A
VSS
Active Soft start and voltage
300
400
500
mV
CURRENT LIMIT AND ZERO CURRENT COMPARATOR
ILIM
Input bias current
RILIM = 2K to 200K
4.655.4
A
Zero Crossing Comparator offset
Phase-gnd
-2
2
mV
KILIM
Current limit factor
1.6
1.8
2
A
Table 4. Pin Function (continued)
N°
Name
Description
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相關代理商/技術參數(shù)
參數(shù)描述
L6997DTR 功能描述:DC/DC 開關控制器 Adjustable Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK
L6997S 功能描述:DC/DC 開關控制器 STEP DOWN CONTROLLER Lo Vltg Operations RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK
L6997STR 功能描述:DC/DC 開關控制器 3.0 to 5.5V Step-Dwn RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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
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