EUP9268 Datasheet, PDF (1/1 Pages) Eutech Microelectronics Inc – Constant-Voltage Constant-Current Flyback Controller Using Opto-Coupled Feedback

EUP9268
Constant-Voltage Constant-Current Flyback
Controller Using Opto-Coupled Feedback
DESCRIPTION
The EUP9268 is a high performance AC-DC power
supply controller which provides constant output
voltage (CV) using the Secondary Side Regulation
(SSR) and accomplishes constant output current (CC)
through Primary-side Regulation (PSR) techniques.
The device together with an external depletion mode
NFET provides a fast start-up time without consuming
extra power dissipation in no-load. The drive output
interfaces to a MOSFET power switch. Discontinuous
conduction mode (DCM) with valley-switching
effectively reduces switching losses.
The controller operates in pulse width modulation
mode (PWM) or pulse frequency modulation mode
(PFM) automatically to keep the conversion high
efficiency within the line ranges and contains thermal
shutdown function, over-voltage protection and
over-current protection. A wide switching frequency
range from 170Hz to 100kHz can achieve both less
than 30mW no-load power dissipation and high
average active efficiency.
FEATURES
<30mW No-Load Power.
±1% Voltage Regulation and ±5% Current
Regulation
Clamped Gate-Driver Output for MOSFET
170Hz ~ 100kHz Switching Frequency
Tiny External Components
Opto-Coupler Feedback of CV and Primary
Side Regulation(PSR) for CC
Active Start-up Scheme Enables Fastest
Possible Start-up.
Available in SOT23-6 and SOP-8 Packages
RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
APPLICATIONS
Adapters for Consumer Electronics
AC/DC Power
Typical Application Circuit
DS9268 Ver1.0 Nov. 2015
Figure 1. SOT23-6 Typical Application Circuit
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