- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄372240 > SRM4010 DC:DC Converter PDF資料下載
參數(shù)資料
| 型號(hào)： | SRM4010 |
| 英文描述： | DC:DC Converter |
| 中文描述： | 直流：DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 3/11頁(yè) |
| 文件大?。?/td> | 224K |
| 代理商： | SRM4010 |
Microsemi
Colorado Division
800 Hoyt Street, Broomfield, CO. 80020, 303-469-2161, Fax: 303-466-3775
Page 3
Copyright 2000
2003-02-05 Rev. IR
W
M
.
C
SRM4010
40A Synchronous Rectifier Module
COLOR ADO DIVISION
F U N C T IO N A L P IN D E S C RIP T IO N
Pin
Number
1
Pin
Name
CTCH
Function and description
This is the power MOSFET drain for the Catch device. It connects to the output inductor and the
positive of the forward converter transformer secondary. This power device carries the load
current when the primary switch is OFF.
This is the power MOSFET Drain for the forward device. This pin connects to the negative of
the forward transformer. This carries the current in the forward direction when the primary
switch is ON.
The signal reference for external tailoring parts.
This is the input signal to the linear regulator. It is usually fed from internal diodes from the
Drains of the Catch and forward MOSFETs. In some cases with low voltage outputs, this can be
used as an input if the peak voltage on the MOSFETs is less than what is required to operate the
regulator. The regulator requires 8 volts of input to regulate at 5 volts.
5V regulator output. It is also available for use with feedback circuitry that is on the secondary
side. This is useful in low voltage converters where the voltage is too low to operate optical
couplers directly from the output.
This is the common of the power MOSFET synchronous rectifiers
Pin 7 is used to ensure that the transformer can be reset during light load operation. To allow
reset, the forward drive is inhibited for a time before the turn on of the Catch MOSFET Gate. A
capacitor to ground sets the time duration where the forward MOSFET Gate drive is disabled. A
typical value is 22 pF. Increasing the capacitor increases the hold off time.
Pin 8 is used for an external capacitor to tailor the prediction time for the Catch synchronous
rectifier. The external capacitor connects between pin 8 and SGND. This time is the time
between the rise of the Catch Drain voltage and the rise of the Catch Gate voltage. Typical
values of this capacitor are 10 to 47 pF. Increasing the capacitance increases the prediction time
delay.
Pin 9 is used to tailor the module’s ability to differentiate between valid turn on of the Catch
diode and ringing that can occur at light load. This pin is normally open, which sets the boundary
for normal turn on at 50nS for the drain voltage to fall from 4.3 volts to 1.7 volts. In the open
case, fall times between the thresholds that are faster than 50nS are interpreted as valid turn
ON’s caused by the primary being switched off. Transitions slower than 50nS are interpreted as
ringing, which occurs in light load discontinuous operation. In the light load case, the Catch
MOSFET is not turned on. The speed of this threshold can be changed by biasing pin 9. If the
controller is not sensing normal turn off from the primary, biasing this pin to ground through a
resistor can make the controller respond to slower transitions. If the controller is responding
falsely to ringing in a discontinuous mode or skip cycle operation, the controller can be made to
reject faster ringing by biasing pin 9 to the +5V regulator output through a resistor.
2
FWD
3
4
SGND
REG
IN
5
REG
OUT
6
7
PGND
CDLY
8
CPDT
9
SPD
P
A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SRM622-SERIES | Optoelectronic |
| SRM155-SERIES | Optoelectronic |
| SRMB2.5-09FC | Optoelectronic |
| SRMB2.5-09SC | Optoelectronic |
| SRMB2.5-50FC | Optoelectronic |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SRM4HF | 制造商:SSDI 制造商全稱:Solid States Devices, Inc 功能描述:Hyper Fast Rectifier |
| SRM5 | 制造商:SSDI 制造商全稱:Solid States Devices, Inc 功能描述:20 AMP 500 - 1000 VOLTS 5 usec STANDARD RECOVERY RECTIFIER |
| SRM5370 | 制造商:AUK 制造商全稱:AUK corp 功能描述:Dual Color LED Lamp |
| SRM5370-A | 制造商:AUK 制造商全稱:AUK corp 功能描述:Dual Color LED Lamp |
| SRM54ALF | 制造商:PANJIT 制造商全稱:Pan Jit International Inc. 功能描述:ULTRA LOW VF SCHOTTKY |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。