- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄382500 > SG6203SZ (FAIRCHILD SEMICONDUCTOR CORP) Synchronous Rectifier Controller for Flyback Converter PDF資料下載
參數(shù)資料
| 型號： | SG6203SZ |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Synchronous Rectifier Controller for Flyback Converter |
| 中文描述： | 0.5 A SWITCHING CONTROLLER, PDSO8 |
| 封裝： | ROHS COMPLIANT, SOP-8 |
| 文件頁數(shù)： | 2/13頁 |
| 文件大小： | 465K |
| 代理商： | SG6203SZ |
Product Specification
Synchronous Rectifier Controller for Flyback Converter
MARKING DIAGRAMS
SG6203
System General Corp.
Version 1.0.1 (IAO33.0010.B1)
- 2 -
www.sg.com.tw www.fairchildsemi.com
September 24, 2007
PIN CONFIGURATION
ORDERING INFORMATION
Part Number
Pb-Free
Package
SG6203SZ
8-Pin SOP
SG6203DZ
8-Pin DIP
PIN DESCRIPTIONS
Pin
Name
1
Vcc
Function
Supply voltage of gate driver and control circuits.
2
Output
Totem-pole output to drive the synchronous power MOSFET. When the voltage on DET pin falls below 1.4V
from above 2.1V, the synchronous MSOFET is turned on. To prevent the reversed energy flow, this pin is
disabled once the voltage on IN+ pin is lower than that of IN- pin or the internal one-shot timer is terminated.
3
GND
The power ground and signal ground. A 0.1μF decoupling capacitor placed between VCC and GND is
recommended.
4
VZ
Built-in 18V Zener diode. When the flyback output voltage is higher than 18V, this pin can be used to provide a
stable 18V to VCC pin. If the flyback output voltage is lower than 18V, this pin can be left open and the output
voltage connected directly to VCC pin.
5
DET
Connecting a diode from this pin to the transformer secondary winding provides on/off information of the primary
switch. Low DET level indicates the secondary rectifier is conducted, therefore the synchronous MOSFET
should be turned on. DET stays high when the primary switch is conducting or secondary rectifier turns off and
the synchronous MOSFET should be turned off.
6
RT
Current reference. Connecting a resistor from this pin to ground can program the internal current reference I
RT
.
Three internal current sources, which are I
IN+
, I
IN-
, and I
DET
, are then mirrored from I
RT
. I
RT
determines the duration
of the internal one-shot signal, then the maximum on-time of the synchronous MOSFET is obtained by
subtracting the on-time of the primary switch from the one-shot signal duration. If the resistor is too small, the
synchronous MOSFET may be turned off even when the secondary rectifier is still conducting, which decreases
the system efficiency. However, if the resistor is too large, the output is shut off immediately once DET gets high.
In SG6203, an internal phase-locked-loop (PLL) modulates the duration of the internal one-shot signal to
maintain a suitable dead time between the primary switch and the synchronous MOSFET.
7
IN-
The inverting input of the current sense comparator. In discontinuous conduction mode, the secondary rectifier
turns off before the next switching cycle of the primary switch. Once the secondary rectifier is off, the
synchronous MOSFET must be turned off to prevent the reversed energy flow. A resistor connected between
IN+ and IN- can used to develop the zero current crossing signal of the secondary rectifier. Once the voltage on
IN+ is lower than IN-, the output is pulled low.
8
IN+
The non-inverting input of the current sense comparator. In discontinuous conduction mode, the secondary
rectifier turns off before the next switching cycle of the primary switch. Once the secondary rectifier is off, the
synchronous MOSFET must be turned off to prevent the reversed energy flow. A resistor connected between
IN+ and IN- can used to develop the zero current crossing signal of the secondary rectifier. Once the voltage on
IN+ is lower than IN-, the output is pulled low.
T
: D=DIP, S=SOP
P :
Z=Lead Free + ROHS
Compatible
XXXXXXXX
: Wafer Lot
Y
: Year;
WW
: Week
V
: Assembly Location
VZ
GND
IN+
IN-
RT
DET
V
CC
Output
SG6203TP
XXXXXXXXYWWV
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SG6516 | PC Power Supply Supervisors |
| SG6520 | PC Power Supply Supervisors |
| SG6520DZ | PC Power Supply Supervisors |
| SG6520SZ | PC Power Supply Supervisors |
| SG6741 | Highly-Integrated Green-Mode PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SG6229 | 制造商:Semtech Corporation 功能描述: |
| SG6238 | 制造商:Semtech Corporation 功能描述: |
| SG62H | 制造商:Hubbell Premise Wiring 功能描述: |
| SG63 | 制造商:Ametherm Inc 功能描述: |
| SG-636 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:HIGH-FREQUENCY CRYSTAL OSCILLATOR |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。