WS2293B Datasheet, PDF (1/9 Pages) Shenzhen Winsemi Microelectronics Co., Ltd – Switching Mode Power Supply PWM Controller

WS2293B Product Description
Switching Mode Power Supply PWM Controller WS2293B
Features
 Low startup current (4uA)
 Low operation current (1.7mA)
 0.9mA operation current at no-load
 Standby power <75mw
 Current mode operation
 Advanced frequency jittering control
 Patented RT Pin energy saving
technology
 Secondary Rectifier Short Protection
 External programmable OTP and OVP
 Cycle by cycle Over Current Protection
(OCP)
 CS open protection
 Over temperature protection(OTP）
 Soft-start function
 VDD over voltage protection and clamp
 VDD Under voltage lockout with
hysteresis (UVLO）
 Wide operation voltage (7.5-34V)
 Driver Output clamped (13V)
 Soft-driver function for lower EMI
 Constant output power limited
 Over load protection(OLP)
 Maximum Driver Capability: 60W
Applications
Universal switching mode power supply and
offline AC/DC flyback converter:
 Battery Charger
 Power Adaptor
 Set-Top Box Power Supplies
 Open-frame SMPS
Description
The WS2293B is a highly integrated current mode PWM control 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 and RT pin energy-saving contribute to
minimize the power consumption (<75mw) and meet the efficiency
standard of DoE or ErP VI.
The WS2293B 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 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.
The WS2293B 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, and external programmable OTP
and OVP with high precision. 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 WS2293B 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 WS2293B is available in SOT23-6 package.
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