Test Procedure for the NCP154MXTAGEVB Evaluation Board There is a collection test procedures for NCP154 demoboards. This paper offers some helpful test configuration for first contact with ONSEMI NCP154 LDO. 1. QUIESCENT CURRENT Vout_nom+1V or 2.5V DC Supply - + μA Figure 1: Test configuration for measurement IQ, Quiescent Current 1. Connect circuit as shown figure on 1 2. Apply voltage at VInput. Default test Vinput is Vout_nom+1 V or 2.5 V whichever is greater 3. Value shown μA meter is measured quiescent current. 4. Measurement is finished. Disconnect supply voltage. *Note – Be carefully if any device is connected on output, because leakage current can affect measurement accuracy. 10/3/2014 1 www.onsemi.com 2. LOAD REGULATION Vout_nom+1V or 2.5V DC Supply - Electronic load + + IOUT 300 mA 1 mA V A Figure 2: Test configuration for measurement REGLOAD, Load Regulation 1. 2. 3. 4. 5. 6. 7. 8. 10/3/2014 Connect circuit as shown figure on 2 Apply voltage at VInput. Default test Vinput is Vout_nom+1 V or 2.5 V whichever is greater Set minimal required current I1, e.g. 1 mA, and switch load ON. Note the value V1 from voltmeter Vo. Switch load OFF and set maximal required current I2, e.g. 300 mA and switch load ON. Note the value V2 from voltmeter Vo. Load regulation is obtained via following formula: REGLOAD=(V1-V2), [V] Measurement is finished. Disconnect supply voltage. 2 www.onsemi.com 3. LINE REGULATION VOUT_NOM+1.5V VOUT_NOM+0.5V DC Supply - Electronic load + + - IOUT=10mA V O Figure 3: Test configuration for measurement REG LINE, Line Regulation 1. 2. 3. 4. 5. 6. 7. 8. 10/3/2014 Connect circuit as shown on figure 3 Set load to the required current e.g. 10 mA Set minimal input voltage VI1, VOUT_NOM+1V or 2.5V whichever is greater Note the value VI1 and VO1. Set maximal input voltage VI2 = 5.5 V Note the value VI2 and VO2. Load regulation is obtained via following formula: REGLINE=(VO1-VO2)/(VI1-VI2), [V/V] Measurement is finished. Disconnect supply voltage. 3 www.onsemi.com 4. ENABLE START-UP OSCILOSCOPE ~ GENERATOR Electronic load + - Vout_nom+1V or 2.5V DC Supply IOUT=10mA + - Figure 4: Test configuration for measurement enables response 1. 2. 3. 4. 5. 6. Connect circuit as shown on figure 4 Set generator to SQUARE PULSE, 0.9 ≤ AMPLITUDE ≤ VIN, FREQUENCY=10Hz, DUTY=10% Apply voltage at VInput. Default test Vinput is Vout_nom+1 V or 2.5 V whichever is greater Set required IOUT, e.g. 10 mA Connect oscilloscope to EN signal and VOUTPUT. Watch enable response of the regulator after asserting EN pin. Measurement is finished. Disconnect supply voltage. 10/3/2014 4 www.onsemi.com