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PDF MC7731N6 Data sheet ( Hoja de datos )
| Número de pieza | MC7731N6 | |
| Descripción | Current Mode PWM Controller | |
| Fabricantes | Cystech Electonics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MC7731N6 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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CYStech Electronics Corp.
Current Mode PWM Controller
Spec. No. : C494N6
Issued Date : 2012.04.02
Revised Date :
Page No. : 1/10
MC7731N6
Description
MC7731N6 is highly integrated current mode PWM control IC optimized for high performance low
standby power offline fly back converter applications. To meet the international power conservation
requirements, optimized green mode is integrated to
improve the efficiency at light or no load conditions with no audible noise. Slope compensation is
integrated to ensure the stability at high load. Lead edge blanking is integrated to prevent the false trigger
at the transition of the switch. Soft switching control at the gate drive can improve the EMI performance of
the power supply. The Gate-drive output is clamped at 18V to protect the power MOS.
MC7731N6 offers many protection functions with auto self-recovery features, including cycle-by-cycle
current limiting, over-load protection (OLP) and under voltage lockout(UVLO).
Excellent EMI performance is achieved with frequency jitter technique together with soft switching
control at the totem pole gate driver.
Features
●Frequency jitter function to improve EMI performance of power supply
●No-audible-noise green mode Control
● External Programmable PWM Switching Frequency
● Internal Slope Compensation
● Low VDD Startup Current and Low Operating Current
● Leading Edge Blanking
● UVLO
● Gate Max Output Voltage Clamp at 18V
● Overload Protection (OLP).
● Line Compensation Over Current Protection (OCP)
Applications
Offline AC/DC flyback converter for
● Battery Charger
● Power Adaptor
● Set-Top Box Power Supplies
● Open-frame SMPS
● PC 5V Standby Power
MC7731N6
CYStek Product Specification
1 page  
Output voltage clamped level
Output rising time
Output falling time
CYStech Electronics Corp.
Spec. No. : C494N6
Issued Date : 2012.04.02
Revised Date :
Page No. : 5/10
VO_clamp
Tr
Tf
Cl=1nf
Cl=1nf
18 V
220 nS
70 ns
OPERATION DESCRIPTION
Over-view description
The MC7731N6 includes all necessary function to build an easy and cost effective solution for low power supplies to
meet the international power conservation requirements.
Start-up current
Startup current of MC7731N6 is designed to be very low so that VDD could be charged up above UVLO (exit)
threshold level and device starts up quickly. Also a large value startup resistor can be used to minimize the power
loss.
Green Mode Operation （Patent）
At light load or no load condition, the switch loss become the major loss of the power supply, to reduce the power
wasted in light and no load condition, based on a special designed voltage controlled oscillator, green mode
operation of the power supply can be achieved by using MC7731N6. The controller will judge the load condition
based on the voltage of FB pin. In light load the FB voltage will decrease, when VFB is lower than a set threshold
voltage, a FB depending time (TR2) will be generated by the oscillator and decrease the operating frequency of the
power supply, the minimum frequency is set about 22kHZ. The function block and the working waveform can be
depicted as below:
MC7731N6
CYStek Product Specification
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MC7731N6.PDF ] | |
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