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PDF XN1042 Data sheet ( Hoja de datos )
| Número de pieza | XN1042 | |
| Descripción | Current Mode PWM Controller | |
| Fabricantes | ETC | |
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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 the signal glitch ■ ExternalProgrammable Over Temperature
due to snubber circuit diode reverse recovery. This greatly Protection (OTP)
helps to reduce the external component count and system ■With or Without Built in VDD OVP for System
cost in application.
OVP
XN1042 offers complete protection coverage with
■Under Voltage Lockout with Hysteresis (UVLO)
automatic self-recovery feature including Cycle by
■Gate Output Maximum Voltage Clamp (18V)
Cycle current limiting (OCP), over load protection
■Line Compensated Cycle-by-Cycle Over current
(OLP), over temperature protection (OTP), VDD over
Threshold Setting For Constant Output Current
voltage protection (OVP) and under voltage lockout
Limiting Over Universal Input Voltage Range
(UVLO). The Gate-drive output is clamped at 18V to
(OCP)
protect the power MOSFET. In XN1042, OCP threshold ■Over Load Protection. (OLP)
slope is internally optimized for 50KHz switching
frequency application to reach constant output power
APPLICATIONS
limit over universal AC input range. Excellent EMI
Offline AC/DC flyback converter for
performance is achieved with soft switching control
■Laptop Power Adaptor
at the totem pole gate drive output.
■PC/TV/Set-Top Box Power Supplies
■Open-frame SMPS
TYPICAL APPLICATION
■Battery Charger
XN1042
1
1 page  
Data sheet of XN 1042
Current Mode PWM Controller
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet XN1042.PDF ] | |
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