QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 544 MICROPOWER STEP-DOWN SWITCHING REGULATOR IN THINSOT

Transcription

1 QUICK STRT GUIDE FOR DEMONSTRTION CIRCUIT MICROPOWER STEP-DOWN SWITCHING REGULTOR IN THINSOT LT9ES6 DESCRIPTION Demonstration circuit features the LT9 and LT9- wide input range micro power step-down switching regulators. There are two switching regulator circuits in DC, the LT9ES6 circuit designed to convert.v~v input to.v at 0m output and the LT9ES6- circuit designed for the same input and output voltage at 0m load current. Each circuit has two jumpers for testing mode operation and selecting the output voltage setting (.V or V). Placing the jumper (JP & JP) to RUN enables LT9 step down converter operation and placing the jumper to disables the LT9 and the circuit will turn off. The output voltage jumper (JP & JP) changes the feedback resistor value to change the output voltage. Placing the jumper at.v sets the output to.v and placing the jumper at V sets the output voltage to V. For V output operation, the input voltage range needs to be 6.V ~V. The aluminum electrolytic input capacitor is used at the input for damping the voltage overshoot ringing caused by a low impedance voltage source and a long input power cable (LC tank). See pplication Note 88 for more details. Design files for this circuit board are available. Call the LTC factory. Table. Performance Summary PRMETER CONDITION VLUE Minimum Input Voltage For.V output, 6.V Min. for V output.v Maximum Input Voltage V Maximum Output Current.V~V input to.v output 0m V OUT REG 60mV QUICK STRT PROCEDURE UPPER CIRCUIT (BOOST CONVERTER) Refer to Figure for proper measurement equipment setup and follow the procedure below:. Connect the input power supply (set at 7V initially) to the Vin and pins.. Turn on the input power supply and observe the output voltage. The output voltage should read.v ± 0.06V.. Test the function by moving the JP jumper from RUN to (turn on the load box preset at 0m for a few seconds to discharge the output capacitor). The output should read 0V.. Return the jumper back to RUN. The output voltage should now read.v ± 0.06V.. Turn on the load box preset at 0m. The input current should read 0m and the output voltage should be.v ± 0.06V. 6. Slowly change the input power supply voltage from.v to V while observing the output voltage. The output should stay within.v ± 0.06V. 7. Observe the input current at V, it should read m. 8. Change the input power supply voltage back to 7V and check the output ripple using the oscilloscope. The output ripple should not be higher than 0mV. lso check the switching frequency. The period should be us.

2 QUICK STRT GUIDE FOR DEMONSTRTION CIRCUIT MICROPOWER STEP-DOWN SWITCHING REGULTOR IN THINSOT LOWER CIRCUIT (BOOST CONVERTER) Refer to Figure for proper measurement equipment setup and follow the procedure below:. Connect the input power supply (set at 7V initially) to the Vin and pins.. Turn on the input power supply and observe the output voltage. The output voltage should read.v ± 0.06V.. Test the function by moving the JP jumper from RUN to (turn on the load box preset at 0m for a few seconds to discharge the output capacitor). The output should read 0V.. Return the jumper back to RUN. The output voltage should read.v ± 0.06V.. Turn on the load box preset at 0m. The input current should read 0m and the output voltage should be.v ± 0.06V. 6. Slowly change the input power supply voltage from.v to V while observing the output voltage. The output should stay within.v ± 0.06V. 7. Observe the input current at V, it should read 0m. 8. Change the input power supply voltage back to 7V and check the output ripple using the oscilloscope. The output ripple should not be higher than 0mV. lso check the switching frequency. The period should be us.

3 QUICK STRT GUIDE FOR DEMONSTRTION CIRCUIT MICROPOWER STEP-DOWN SWITCHING REGULTOR IN THINSOT

4 D D Vin.V to V E + C 0uF C.uF RUN JP U LT9ES6 VIN SW 6 R K BOOST FB N8WS C 0.uF L D B00W 7uH R 8K V.V JP R 6K C 0pF Vout.V@0m V@00m E D C R 6K + C 68uF 6.V POSCP E E C D B Vin.V to V E + C8 0uF C9.0uF RUN JP U LT9ES6- R7 K VIN SW 6 BOOST FB N8WS C 0.uF L D B00W 0uH R 8K V.V R0 6K JP R9 6K C7 0pF + C0 68uF 6.V POSCP Vout.V@60m V@m E6 B E7 E8 CONTRCT NO. 60 McCarthy Blvd. Milpitas, C 90 PPROVLS DTE TECHNOLOGY Phone: (08)-900 Fax: (08)-007 DRWN June Wu 6/0/0 CHECKED TITLE LT9ES6/LT9ES6- PPROVED Micropower Step-Down Switching Regulators in ThinSOT ENGINEER Dave Kim 6/0/0 DESIGNER SIZE CGE CODE DWG NO REV DEMO CIRCUIT Thursday, December, 00 SCLE: FILENME: SHEET OF

5 Linear Technology Corporation LT9ES6/ LT9ES6- Bill Of Material Demo Bd. # Item Qty Reference Part Description Manufacture / Part # 6/7/00 C,C CP., X7R, 0.uF, 0V, 0% 060 VX, 060ZCMT C,C7 CP., C0G, 0pF, 0V, 0% 00 VX, 0000KT C CP., XR,.uF, V, 0% 0 Taiyo Yuden, GMKBJMN C9 CP., XR,.0uF, V, 0% 06 Taiyo Yuden, GMK6BJ0ML C,C8 CP., luminum, 0uF, V X6.0 SNYO, CV0X 6 C,C0 CP., POSCP, 68uF, 6.V B SIZE SNYO, 6TPB68M 7 D,D DIODE, N8WS, SOD- DIODES INC., N8WS-7 8 D,D Schottky Barrier REC., B00W, SOD- DIODES INC., B00W E-E8 TESTPOINT, TURRET,.09" MILL-MX, 0-0 JP-JP SINGLE ROW HEDER, PIN COMM CON, 80S-0-G JP-JP SHUNT, COMM CON, CCIJMM-8G L INDUCTOR, 7uH, CDHD8 SUMID, CDRHD8-70 L INDUCTOR, 0uH, DO608 COILCRFT, DO608C- R,R9 RES., CHIP, 6K, /6W, % 00 C, CR0-6FM R,R RES., CHIP, 8K, /6W, % 00 C, CR0-8FM 6 R,R0 RES., CHIP, 6K, /6W, % 00 C, CR0-6FM 7 R7,R RES., CHIP, K, /0W, % 080 C, CR0-FM 8 U I.C. LT9ES6, Thin SOT-6 LINER, LT9ES6 9 U I.C. LT9ES6-, Thin SOT-6 LINER, LT9ES6-0 PRINTED CIRCUIT BORD DEMO CIRCUIT # Page - of -