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PDF SD6832 Data sheet ( Hoja de datos )
| Número de pieza | SD6832 | |
| Descripción | CURRENT MODE PWM+PFM CONTROLLER | |
| Fabricantes | SL | |
| Logotipo |  |
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Silan
Microelectronics
SD6832_Datasheet
CURRENT MODE PWM+PFM CONTROLLER WITH BUILT-IN HIGH
VOLTAGE MOSFET
DESCRIPTION
SD6832 is current mode PWM+PFM controller with built-in high-
voltage MOSFET used for SMPS。
It features low standby power and low start current. In standby
mode, the circuit enters burst mode to reduce the standby
power dissipation.
The switch frequency is 25~67KHz decided by the load with
jitter frequency for low EMI.
Built-in peak current compensation circuit makes the limit peak
current stable even with different input AC voltage. Maximum
peak current compensation during power-on reduces pressure
on transformer to avoid saturation, the peak current
compensation will decrease for balance after power-on. Limit
output current can be adjusted through the resistor connected to
CS.
It integrates various protections such as undervoltage lockout, APPLICATIONS
overvoltage protection, overload protection, leading edge
blanking, primary winding overcurrent protection and thermal
* SMPS
shutdown. The circuit will restart until normal if protection
occurs.
FEATURES
* Energy Star 2.0 standard
* Lower start-up current (3µA)
* Various switching frequency following load for the high
efficiency
* Frequency jitter for low EMI
* Overvoltage, primary winding overcurrent, overload and
over temperature protections.
* External peak current sense resistor
* Undervoltage lockout
* Built-in high voltage MOSFET
* Auto restart mode
* Peak current compensation
* Maximum peak current compensation for initialization to
realize the soft start function.
* Burst mode
* Cycle by cycle current limit
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV: 1.2
2013.01.05
Page 1 of 10
1 page  
Silan
Microelectronics
SD6832_Datasheet
FUNCTION DESCRIPTION
SD6832 is designed for off-line SMPS, consisting of high voltage MOSFET, optimized gate driver and
current mode PWM+PFM controller which includes frequency oscillator and various protections such as
undervoltage lockout, overvoltage protection, overload protection, primary winding overcurrent protection
and over temperature protection. Frequency jitter generated from oscillator is used to lower EMI. Burst
mode is adopted during light load to lower standby power dissipation, and function of lead edge blanking
eliminates the MOSFET error shutdown caused by interference through minimizing MOSFET turning on
time. Peak current compensation reduces the pressure on transformer during circuit starts and output
power limit can be adjusted by resistor through CS pin. Few peripheral components are needed for higher
efficiency and higher reliability and it is suitable for flyback converter and forward converter.
1. Under Voltage Lockout and Self-Start
At the beginning, the capacitor connected to pin VCC is charged via start resistor by high voltage AC and the
circuit starts to work if voltage at VCC is 15.5V. The output and FB source current are shutdown if there is
any protection during normal operation and VCC is decreased because of powering of auxiliary winding. The
whole control circuit is shutdown if voltage at VCC is 8.3V below to lower current dissipation and the
capacitor is recharged for restarting.
VCC
VSTART
VSTOP
0
ICC
t
t
0
Powered by
start resistor
Powered by
assistant winding
Powered by start resistor
2. Frequency Jitter and reduced frequency mode
The oscillation frequency is kept changed for low EMI and decreasing radiation on one frequency. The
oscillation frequency changes within a very small range to simplify EMI design. The rule of frequency
changing (frequency center is 67KHz): ±2.5KHz change in 4ms, 63 frequency points in all.
For high efficiency, reduced frequency mode is adopted with two methods:
1. Frequency is reduced according to current output from FB pin. If IFB is higher than I1, the frequency f
decreases from 67KHz and f is 25KHz when the IFB increases to I2 or higher. This is shown in left
diagram below.
2. IPK is changed according to IFB, shown in right diagram below.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV: 1.2
2013.01.05
Page 5 of 10
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SD6832.PDF ] | |
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