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TPS92314A Datasheet(PDF) 8 Page - Texas Instruments |
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TPS92314A Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 26 page  TPS92314 TPS92314A SNVS856B – JUNE 2012 – REVISED MAY 2013 www.ti.com APPLICATION INFORMATION The TPS92314/14A is an off-line controller specifically designed to drive LEDs. This device operates in Critical Conduction Mode (CRM) with adaptive Constant ON-Time control, so that high power factor can be achieved naturally. The TPS92314/14A can be configured as an isolated or non-isolated off-line converter. Refer to TPS92314/14A typical schematic, on the front page, in the following discussion. The TPS92314/14A flyback converter consists of a transformer which includes three windings LP, LS and LAUX. An external MOSFET Q1 and inductor current sensing resistor RISNS. Secondary side components are secondary side transformer winding LS, output diode DOUT, and output capacitor COUT. An auxiliary winding is required, and serves two functions. Auxiliary power is developed from the winding to power the TPS92314/14A after start-up, and detect the zero crossing point due to the end of a complete switching cycle. During the on-period, Q1 is turned on, and current flows through LP, Q1 and RISNS to ground, input energy is stored in the primary inductor LP. Simultaneously, the ISNS pin of the device monitors the voltage of the current sensing resistor RISNS to perform the cycle-by-cycle inductor current limit function. During the time MOSFET Q1 is off, current flow in LP ceases and the energy stored during the on cycle is released to output and auxiliary circuits. During Q1 off-time current in the secondary winding LS charges the output capacitor COUT through DOUT and supplies the LED load. During Q1 on-time, COUT is responsible to supply load current to LED load during subsequent on-period. Also during Q1 off-time current is delivered to the auxiliary winding through DVCC and powers the TPS92314/14A. The voltage across LAUX, VLAUX is fed back to the ZCD pin through a resistor divider network formed by RAUX1 and RAUX2 to perform zero crossing detection of VLAUX, which determines the end of the off-period of a switching cycle. The next on period of a new cycle will be initiated after an inserted delay of 2 x tDLY. The tDLY is programmable by a single resistor connecting the DLY pin and ground. The setting of the delay time, tDLY will be described in a separate paragraph. The driver signal tON time width is generated by comparing an internal generated saw-tooth waveform with the voltage on the COMP pin (VCOMP). Since VCOMP is slow varying, tON is nearly constant within an AC line cycle. The duration of the off-period (tOFF) is determined by the rate of discharging of the secondary current through the transformer. Also, where • n is the turn ratio of LP and LS. (1) Figure 14 shows the typical waveforms in normal operation. 8 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Product Folder Links: TPS92314 TPS92314A |
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