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UCC28512N Datasheet(PDF) 2 Page - Texas Instruments |
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UCC28512N Datasheet(HTML) 2 Page - Texas Instruments |
2 / 39 page UCC28510, UCC28511, UCC28512, UCC28513, UCC28514, UCC28515, UCC28516, UCC28517 SLUS517B − DECEMBER 2002 − REVISED AUGUST 2004 2 www.ti.com DESCRIPTION (CONTINUED) The transient response of the circuit is enhanced by allowing a much faster charge/discharge of the voltage amplifier output capacitance when the output voltage falls outside a certain regulation window. A number of additional features such as UVLO circuit with selectable hysteresis levels, an accurate reference voltage for the voltage amplifier, zero power detect, OVP/enable, peak current limit, power limiting, high-current output gate driver characterize the PFC section. The PWM section features peak current mode control (with a ramp signal available to add slope compensation), programmable soft-start, accurate maximum duty cycle clamp, peak current limit and high-current output gate driver. The oscillator for the combination controller is available in two versions. In UCC28510, UCC28511, UCC28512, and UCC28513, the PWM and the PFC circuits are switched at the same frequency. In the UCC28514, UCC28515, UCC28516, and UCC28517, the PWM stage frequency is twice that of the PFC frequency. The PWM stage is suppressed until the PFC output has reached 90% of its programmed value during startup. During line dropout and turn off, the device allows the PWM stage to operate until the PFC output has dropped to 47% (UCC28512, UCC28513, UCC28516, and UCC28517) or 71% (UCC28510, UCC28511, UCC28514, and UCC28515) of its nominal value. See available options table on page 1 for a summary of options. The UCC28510 family also features leading-edge modulation for the PFC stage and trailing-edge modulation for the PWM stage in order to reduce the ripple current in the boost output capacitor. The current amplifier implementation associated with this scheme also results in better noise immunity. Available in 20-pin N and DW packages. SIMPLIFIED APPLICATION DIAGRAM 12 3 16 18 10 5 7 2 UCC2851X GT1 VSENSE ISENSE1 IAC GT2 VREF VERR RT D1 VAC 15 14 13 11 17 19 20 PWRGND VAOUT 1 6 VFF MOUT CAOUT PKLMT SS2 8 9 D_MAX CT_BUFF GND ISENSE2 VCC REF PRIMARY SECONDARY + − VOUT 4 REF BIAS RECT + − PWM V−LOOP Z Z Z |
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