User Guide for LINEAR TECHNOLOGY models including: LT3462ES6 and LT3462AES6, LT3462ES6 and LT3462AES6 Inverting DC DC Converters, LT3462ES6, LT3462AES6, LT3462ES6 Inverting DC DC Converters, LT3462AES6 Inverting DC DC Converters, Inverting DC DC Converters, DC Converters, Converters
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DocumentDocumentQUICK START GUIDE FOR DEMONSTRATION CIRCUIT 670 LT3462ES6 / LT3462AES6 INVERTING DC/DC CONVERTERS LT3462ES6 and LT3462AES6 DESCRIPTION Demonstration circuit 670 features two high frequency, monolithic LT 3462 and LT3462A inverting converters. Both circuits have 5V input voltage and -5V output voltage with 100mA maximum output current. Negative SEPIC converter topology is used to minimize the input and output voltage ripple. The LT3462 circuit is optimized for best efficiency with the 1.2MHz switching frequency. The LT3462A circuit is optimized for minimum circuit size and profile with the 2.7MHz switching frequency. Both circuits have small footprint size because of the integrated Schottky diode inside the ICs. Design files for this circuit board are available. Call the LTC factory. LT is a trademark of Linear Technology Corporation Table 1. Performance Summary (TA = 25°C) PARAMETER Input Voltage Output Voltage VOUT Maximum Output Current Typical Output Ripple Voltage Nominal Switching Frequency Efficiency CONDITION IOUT = 0A to 100mA IOUT = 50mA , 20MHz BW LT3462ES6 LT3462AES6 LT3462ES6, VIN = 5V, IOUT = 100mA LT3462AES6, VIN = 5V, IOUT = 100mA QUICK START PROCEDURE VALUE 5V ± 10% -5V ± 3% 100mA 10mVPP 1.2MHz 2.7MHz 71% Typical 61% Typical Demonstration circuit 670 is easy to set up to evaluate the performance of the LT3462 and LT3462A. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: NOTE: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the Vin or Vout and GND terminals. See Figure 2 for proper scope probe technique. 1. Place both ON/OFF jumpers in the ON position. 2. With power off, connect the 5V input power supply to VIN and GND. Connect the load between VOUT and GND. Preset the load current at 0A (minimum). 3. Turn on the power at the input. 1 Downloaded from Arrow.com. QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 670 LT3462ES6 / LT3462AES6 INVERTING DC/DC CONVERTERS NOTE: Make sure that the input voltage does not exceed 5.5V. 4. Check for the proper output voltages. Vout = -4.85V to -5.15V. NOTE: If there is no output, temporarily disconnect the load to make sure that the load is not set too high. 5. Once the proper output voltages are established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. (a) (b) Figure 1. Proper Measurement Equipment Setup (a) LT3462ES6 test setup, (b) LT3462AES6 test setup GND VIN Figure 2. Measuring Input or Output Ripple 2 Downloaded from Arrow.com. QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 670 LT3462ES6 / LT3462AES6 INVERTING DC/DC CONVERTERS 3 Downloaded from Arrow.com. QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 670 LT3462ES6 / LT3462AES6 INVERTING DC/DC CONVERTERS 4 Downloaded from Arrow.com. QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 670 LT3462ES6 / LT3462AES6 INVERTING DC/DC CONVERTERS 5 Downloaded from Arrow.com.