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NB Adaptor
NB Adaptor
Switching AC/DC Adaptor with Low No-Load Input Power
TV and Monitor Applications
Open Frame Power Supply
PowerZeroTM Technology
PowerZeroTM Technology
Integrated 700V Start-Up Device
Brown-In and Brown-Out
Low No-Load Input Power (<50mW) (RT7781G/L/A/C)
Low No-Load Input Power (<30mW) (RT7781T)
Accurate Over Load Protection
Driver Capability : 400mA/-400mA
PRO Pin for Arbitrary External Protection
(RT7781G/L/A/T)
ACD Pin for TV Application (RT7781C)
Disable Mode for 30mW Solution (RT7781T)
Jittering Frequency
Soft Driving for Reducing EMI Noise
VDD Over Voltage Protection
Internal Over Temperature Protection
Secondary Rectifier Short Protection
CS Pin Open Protection
RoHS Compliant and Halogen Free
PowerZero™ Series PWM Flyback Controller
The RT7781 is a series of high-performance current mode PWM controllers with ,Richtek proprietary PowerZeroTM technology. The PowerZeroTM provides an ,excellent green power solution, especially under light-load and no-load ,conditions. The integrated high-voltage device provides fast start-up function ,without external start-up resistors. It also features brown-in and brown-out ,detection.The RT7781 offers complete protection functions such as internal ,Over-Temperature Protection (OTP), Over-Load Protection (OLP) and VDD ,Over-Voltage Protection (OVP). It also features Secondary Rectifier ,Short-circuit Protection (SRSP) and Current Sensing pin (CS) open-circuit ,protection. Due to these protections, design of power supply unit becomes ,simple and reliable.,,The RT7781 provides several versions, shown in the RT7781 version table, for ,various applications. It is targeted for cost-effective and compact power ,supply units such as NB adaptors.,,
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