AMS 2263
GENERAL DESCRIPTION
AMS2263
is a highly integrated current mode PWM
Excellent EMI performance is achieved with
frequency shuffling technique together with soft
switching control at the totem pole gate drive
output.
Tone energy at below 20KHZ is minimized in the
design and audio noise is eliminated during
operation.
AMS2263
is offered in SOT23-6, SOP-8
control IC optimized for high performance, low
standby power and cost effective offline flyback
converter applications in sub 30W range.
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 loss. Lower standby power and higher
conversion efficiency is thus achieved.
VDD low startup current and low operating
current contribute to a reliable power on startup
design with
AMS2263.
A large value resistor could
and DIP-8 packages.
FEATURES
Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power
Design.
Audio Noise Free Operation
External Programmable
Frequency
Internal Synchronized Slope Compensation
Low VDD Startup Current and Low Operating
PWM Switching
thus be used in the startup circuit to minimize the
standby power.
The
internal
slope
compensation
improves
Current (1.4mA)
Leading Edge Blanking on Current Sense
Input
Good
Protection
Coverage
With
Auto
Self-Recovery
VDD Over Voltage Clamp and Under Voltage
Lockout with Hysteresis (UVLO)
Gate Output Maximum Voltage Clamp (18V)
Line Input Compensated Cycle-by-Cycle
Over-current Threshold Setting For Constant
Output Power Limiting Over Universal Input
Voltage Range.
Overload Protection (OLP)
system large signal stability and reduces the
possible sub-harmonic oscillation at high PWM
duty cycle output. Leading-edge blanking on
current sense(CS) input removes the signal glitch
due to snubber circuit diode reverse recovery and
thus greatly reduces the external component
count and system cost in the design.
AMS2263
offers complete protection coverage with
automatic
self-recovery
feature
including
Cycle-by-Cycle current limiting (OCP), over load
protection (OLP), VDD over voltage clamp and
under voltage lockout (UVLO).
power MOSFET.
The Gate-drive
output is clamped to maximum 18V to protect the
1
Advanced Monolithic Systems
http://www.ams-semitech.com
AMS [ Advanced Monolithic Systems Ltd ]
