HIGH PRECISION CC/CV PRIMARY SIDE SWITCHING REGULATOR
DESCRIPTION
The UTC UPSRB02 is a primary control unit for switch mode
charger and adapter applications. The controlled variable is
transferred by an auxiliary winding from the secondary to the
primary side. The device uses Pulse Frequency Modulation
(PFM) and Pulse Width Modulation (PWM) method to build
discontinuous conduction mode (DCM) flyback power supplies.
The UTC UPSRB02 operates in primary-side sensing and
regulation. Opto-coupler and TL431 could be eliminated. It also
eliminates the need of loop compensation circuitry while
maintaining stability.
The UTC UPSRB02 achieves high precision CV/CC regulation
and high power efficiency. It offers comprehensive protection
coverage with auto-recovery features including Cycle-by-cycle
current limiting, output over voltage protection, VDD over voltage
protection, feedback loop open protection, short circuit protection,
leading edge blanking, OTP, VDD under voltage lockout, etc.
FEATURES
* Operation from 3.0V to 40V.
* Short circuit current limiting.
* Low standby current.
* Output switch current of 1.5A without external transistors.
* Frequency of operation from 100Hz to 100kHz.
* Step-up, step-down or inverting switch regulators.
FEATURES
* ±5% constant voltage regulation at universal AC input
* Primary side control without TL431 and opto-coupler
* High precision constant current regulation at universal AC input
* Programmable CV and CC regulation
* Eliminates control loop compensation circuitry
* Flyback topology in DCM operation
* Random frequency modulation to reduce system EMI
* Driver BJT switch
* Programmable cable drop compensation
* Audio noise free operation
* Improved dynamic response
* Built-in leading edge blanking
* Built-in primary winding inductance compensation
* Open circuit protection
* Output over voltage protection
* VDD over voltage protection
* Short circuit protection
* Over temperature protection |
