WS2295B Datasheet, PDF (1/9 Pages) Shenzhen Winsemi Microelectronics Co., Ltd – Switch Power Supply PWM Controller

WS2295B Product Description
Features
 Low startup current (4uA)
 Low operation current (1.7mA,0.9mA
operation current at no-load)
 Low Standby power
 Current mode operation
 Advanced frequency jittering control
 Secondary Rectifier Short Protection
 Cycle by cycle Over Current Protection
(OCP)
 CS open protection
 Over temperature protection(OTP）
 Soft-start function
 VDD over voltage protection and clamp
 Under voltage lockout with hysteresis
(UVLO）
 Wide operation voltage (7.5-34V)
 Driver Output clamped(13V)
 Soft-driver function for lower EMI
 Frequency jittering
 Constant output power limited
 Over load protection(OLP)
Applications
Universal switch power supply and offline
AC/DC flyback converter:
 Battery Charger
 Power Adaptor
 Set-Top Box Power Supplies
 Open-frame SMPS
WS2295B Switch Power Supply PWM Controller
Description
The WS2295B is a highly integrated current mode PWM switch IC
which is optimized for high performance. It is applied for small and
medium-sized power supply devices, for example, the power adapter.
For lower standby power consumption and higher energy saving
requirement, the IC has the Burst Mode function and very low startup
current and operating current. At the condition of no load or light load,
the IC operates in extended ‘burst mode’ to minimize switching loss by
lower the switching frequency. The patented technologies of
energy-saving at no-load contribute to minimize the power consumption
(<75mw) and meet the efficiency standard of DoE or ErP VI.
The WS2295B applies advanced frequency jittering control to
improve EMI performance at half load and light-load. Besides, it covers
wide supply voltage(7.5-34V), which greatly facilitate the transformer
design and the compatibility of the system.
The internal synchronous slope compensation circuit improves
system large signal stability and reduces the possibility of the
sub-harmonic oscillation at high PWM duty cycle output. Leading-edge
blanking on current sense input avoids the signal glitch due to snubber
circuit diode reverse recovery and thus greatly reduces the external
component count and system cost in the design.
The WS2295B offers complete protection coverage with automatic
self-recovery feature including cycle by cycle over current protection
(OCP), over load protection (OLP), over temperature protection (OTP),
VDD over Voltage Protection (OVP), under voltage lockout (UVLO),
Secondary rectifier short protection. The gate-driven output is clamped
to maximum 13V to protect the external MOSFET.
Excellent EMI performance is achieved by using the frequency jitter
and the soft-switching at the totem pole gate drive output. The audio
energy at below 20KHz is minimized in the design and audio noise is
eliminated during operation.
The WS2295B can be used as the best alternative products of the
linear power supply or the RCC-mode power to improve the whole
performance of the switching power system and lower the cost.
The WS2295B is available in DIP7 package.
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
Copyright@Winsemi Microelectronics Co., Ltd., All right reserved.
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
0322