SGP100

Product Specification Primary-side-control PWM Controller SGP 100 applications. The result is a low-cost, smaller and lighter charger than a conventional design or a linear transformer. To minimize t he s tandby po wer co nsumption, t he proprietary g reen-mode funct ion pr ovides o ff-time modulation t o linea rly d ecrease P WM f requency under light-load conditions. Th is green-mode fun ction all ows the power s upply to meet p ower conservation requirements. The s tart-up curr ent i s onl y 10µA, which allows large start-up resistance for further power saving. A charger ca n be implemented w ith few ex ternal components a nd mi nimal c ost. A t ypical output C V/CC characteristic envelope is shown in Figure 1. Vo(V) FEATURES „ „ „ „ „ „ „ „ „ „ „ Constant-voltage (CV) and constant-current (CC) control without secondary-feedback circuitry Green-mode function: PWM frequency linearly decreasing Fixed PWM frequency at 42kHz with frequency hopping to solve EMI problems Low start-up current: 10μA (typical) Low operating current: 6.5mA (typical) Peak-current-mode control in CV mode Cycle-by-cycle current limiting VDD over-voltage protection with latch (OVP) VDD under-voltage lockout (UVLO) Gate output maximum voltage clamped at 18V Fixed over-temperature protection with latch +/- 10% APPLICATIONS „ „ Battery chargers for cellular phones, cordless phones, PDA, digital cameras, and power tools Replacement for linear transformer and RCC SMPS DESCRIPTION This highl y int egrat...