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TK75003D Datasheet(PDF) 11 Page - TOKO, Inc |
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TK75003D Datasheet(HTML) 11 Page - TOKO, Inc |
11 / 14 page January 1999 TOKO, Inc. Page 11 TK75003 t OFF = C T x 14 k Ω. FIGURE 5: TK75003 IN A FORWARD CONVERTER WITH CONSTANT OFF-TIME CURRENT-MODE CONTROL FIGURE 6: TIMING PIN AND FEEDBACK PIN VOLTAGES WITH CONSTANT OFF-TIME CURRENT- MODE CONTROL TK75003 IN NON-ISOLATED APPLICATIONS Although the IC was intended for off-line power-supply applications with the voltage-error amplifier at the isolated output, it is easy and economical to use the device in non- isolated applications, too. Figure 7 shows a low-cost boost power factor corrector controlled by the TK75003. Power factor correction is achieved by controlling the boost converter with constant-frequency peak-current control and exploiting the variation of the allowed peak-current level caused by the variable duty ratio and the stabilizing ramp. Figure 8 shows a buck-boost converter with negative input voltage and positive output voltage, controlled by the TK75003. In both cases, the voltage-error amplifier is a TL431 shunt regulator, and a PNP transistor provides interface between the TL431 and the control IC. FIGURE 7: TK75003 IN A LOW COST BOOST POWER FACTOR CORRECTOR FIGURE 8: NON-ISOLATED NEGATIVE-TO-POSITIVE CONVERTER APPLICATION INFORMATION (CONT.) GND VCC CT FB DRV Q1 VAUX RS TL431 + VOUT VIN R1 VAUX OC CT 3.2 V 1.1 V 0 0.98 V FEEDBACK VOLTAGE LEVEL FB CT FB CT GND VCC CT FB DRV TL431 VIN (-) VOUT (+) GND VCC CT FB DRV TL431 VOUT + AC IN |
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