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参数资料
| 型号： | LM5025CSDX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, DSO16 |
| 封装： | LLP-16 |
| 文件页数： | 9/16页 |
| 文件大小： | 362K |
| 代理商： | LM5025CSDX |
Connection Diagram
30058916
16-Lead TSSOP, LLP
Ordering Information
Order Number
Package Type
NSC Package Drawing
Supplied As
LM5025CMTC
TSSOP-16
MTC-16
92 Units per anti-static tube
LM5025CMTCX
TSSOP-16
MTC-16
2500 Units on Tape and Reel
LM5025CSD
LLP-16
SDA-16A
Available Soon
LM5025CSDX
LLP-16
SDA-16A
Available Soon
Pin Descriptions
Pin
Name
Description
Application Information
1
V
IN
Source Input Voltage
Input to start-up regulator. Input range 13V to 90V, with
transient capability to 105V.
2
RAMP
Modulator ramp signal
An external RC circuit from Vin sets the ramp slope.
This pin is discharged at the conclusion of every cycle
by an internal FET, initiated by either the internal clock
or the V*Sec Clamp comparator.
3
CS1
Current sense input for cycle-by-cycle limiting
If CS1 exceeds 0.5V the outputs will go into Cycle-by-
Cycle current limit. CS1 is held low for 50ns after
OUT_A switches high providing leading edge blanking.
4
CS2
Current sense input for soft restart
If CS2 exceeds 0.5V the outputs will be disabled and a
softstart commenced. The soft-start capacitor will be
fully discharged and then released with a pull-up
current of 1A. After the first output pulse (when SS
=1V), the SS charge current will revert back to 90 A.
5
TIME
Output overlap/Deadtime control
An external resistor (R
SET) sets either the overlap time
or dead time for the active clamp output. An R
SET
resistor connected between TIME and GND produces
in-phase OUT_A and OUT_B pulses with overlap. An
R
SET resistor connected between TIME and REF
produces out-of-phase OUT_A and OUT_B pulses with
deadtime.
6
REF
Precision 5 volt reference output
Maximum output current: 10 mA Locally decouple with
a 0.1 F capacitor. Reference stays low until the V
CC
UV comparator is satisfied.
7
V
CC
Output from the internal high voltage start-up
regulator. The V
CC voltage is regulated to 7.6V.
If an auxiliary winding raises the voltage on this pin
above the regulation setpoint, the internal start-up
regulator will shutdown, reducing the IC power
dissipation.
www.national.com
2
LM5025C
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