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LT1302-5 Datasheet(PDF) 10 Page - Linear Technology |
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LT1302-5 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  10 LT1302/LT1302-5 APPLICATIONS INFORMATION 2ms/DIV 1302 F07c VOUT 100mV/DIV AC COUPLED ILOAD Figure 7c. 0.01 µF from VC to Ground. Underdamped Response Requires Series R 510mA 10mA IT Pin The IT pin is used to disable Burst Mode, forcing the LT1302 to operate in current mode even at light load. To disable Burst Mode, 3.3k resistor R1 is connected from IT to gound. More conservative frequency compensation must be used when in this mode. A 0.1 µF capacitor and 4.7k resistor from VC to ground has been found to be adequate. Low frequency Burst Mode ripple can be reduced or eliminated using this technique in many appli- cations. To illustrate, the transient load response of Figure 8’s circuit is pictured without and with R1. Figure 8a shows output voltage and inductor current without the resistor. Note the 6kHz burst rate when the converter is delivering 25mA. By adding the 3.3k resistor, the low frequency bursting is eliminated, as shown in Figure 8b. This feature is useful in systems that contain audio circuitry. At very light or zero load, switching frequency drops and eventu- 1ms/DIV 1302 F08a VOUT 100mV/DIV AC COUPLED Figure 8a. IT Pin Floating. Note 6kHz Burst Rate at ILOAD = 25mA. 0.1µF/4.7k Compensation Network Causes 220mV Undershoot 525mA 25mA ILOAD INDUCTOR CURRENT 1A/DIV VOUT 100mV/DIV AC COUPLED 2ms/DIV 1302 F07f 510mA 10mA ILOAD Figure 7f. 0.01 µF, 24k Series RC Results in Optimum Response 2ms/DIV 1302 F07e VOUT 100mV/DIV AC COUPLED ILOAD 510mA 10mA Figure 7e. 0.01 µF, 10k Series RC Shows Good Transient Response. Slight Underdamping Still Noticeable 2ms/DIV 1302 F07d VOUT 100mV/DIV AC COUPLED ILOAD Figure 7d. 0.1 µF with 10k Series RC. Classic Overdamped Response 510mA 10mA VIN SENSE VC SW 10 µH VOUT 5V 600mA IT MBRS130LT3 PGND 0.1 µF LT1302-5 GND 4.7k R1 3.3k 1302 F08 VIN 2.5V + 220 µF 10V + 220 µF 10V + C1 330 µF 0.1 µF Figure 8. Addition of R1 Eliminates Low Frequency Output Ripple in This 2.5V to 5V Boost Converter |
Similar Part No. - LT1302-5_15 |
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Similar Description - LT1302-5_15 |
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