Current Mode PWM Controller
Data sheet of XN 1042
Current Mode PWM Controller
GENERAL DESCRIPTION
The tone energy at below 20KHZ is minimized in
...
Description
Data sheet of XN 1042
Current Mode PWM Controller
GENERAL DESCRIPTION
The tone energy at below 20KHZ is minimized in
XN1042 is a highly integrated current mode PWM
operation. Consequently, audio noise performance is
control IC optimized for high performance, low standby greatly improved. XN1042 is offered in both SOP-8
power and cost effective offline flyback converter
and DIP-8 packages.
applications. PWM switching frequency at normal
operation is externally programmable and trimmed to tight range. At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching
FEATURES ■ Extended Burst Mode Control For Improved ■Efficiency and Minimum Standby Power Design
loss. Lower standby power and higher conversion
■Audio Noise Free Operation
efficiency is thus achieved. VDD low startup current and ■External Programmable PWM Switching Frequency
low operating current contribute to a reliable power on
■Internal Synchronized Slope Compensation
startup design with XN1042. A large value resistor could ■Low VIN/VDD Startup Current(6.5uA) and Low
thus be used in the startup circuit to minimize the standby Operating Current (2.3mA)
power. The internal slope compensation improves system ■Leading Edge Blanking on Current Sense Input
large signal stability and reduces the possible subharmonic ■Complete Protection Coverage With Auto Self-
oscillation at high PWM duty cycle output. Leading-edge Recovery
blanking on current sense input removes ...
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