General Description
In order to enhance the efficiency performance, the
LD5523M1 integrates the multi-mode PWM controller,
which consists of Quasi-Resonant (QR) PWM control for
light load condition and peak load mode for heavy load
condition. Moreover, the QR controller not only gains
the system performance, but also brings the worse EMI
capability, while the frequency swapping function of
LD5523M1 can reduce the EMI emission of SMPS and
helps the power circuit designers to simply deal with
EMI filter and saves several component and developing
time.
The LD5523M1 is implemented in SOT-26 package,
and includes the comprehensive protection function,
such as Over Power Protection (OPP), Over Voltage
Protection (OVP), Output Short Circuit Protection
(OSCP) and internal Over Temperature Protection
(OTP). Furthermore, the programmable brown-in/out
protection is built-in.

Features
 Low Startup Current (<1A)
 0.26mA Ultra-low operating current at light load
 Current Mode Control with Cycle-by-Cycle Current
Limit
 Green Mode Control
 UVLO (Under Voltage Lockout)
 LEB (Leading-Edge Blanking) on CS Pin
 VCC OVP (Over Voltage Protection)
 Adj. OVP (Over Voltage Protection) on FB pin.
 OPP (Over Power Protection)
 External OTP (Over Temperature Protection) on
CS Pin
 Internal OTP (Over Temperature Protection)
 SDSP (Secondary Diode Short Protection)
 Gate Source/Sink Capability: 190mA/-150mA @
output pin with 33nF capacitor.

Applications
 Switching AC/DC Adaptor