Evaluation Board User Guide UG-412 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com Evaluating the ADP7182 Low Noise, Linear Regulator FEATURES GENERAL DESCRIPTION Input voltage range: −2.7 V to −28 V Output current range: 0 mA to −200 mA Output voltage accuracy: ±1% Operating temperature range: −40°C to +125°C Adjustable option voltage set with two external resistors VOUT = −1.22 V × (1 + R1/R2) The ADP7182 evaluation board is used to demonstrate the functionality of the ADP7182 series of linear regulators. Simple device measurements such as line and load regulation, dropout, and ground current can be demonstrated with just a single voltage source, a voltmeter, an ammeter, and load resistors. For more details about the ADP7182 linear regulator, see the ADP7182 data sheet, available at www.analog.com. Figure 1. ADP7182 LFCSP Evaluation Board PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. 10708-002 10708-001 LAYOUT OF THE EVALUATION BOARDS Figure 2. ADP7182 TSOT Evaluation Board Rev. 0 | Page 1 of 8 UG-412 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Line Regulation..............................................................................5 General Description ..................................................................... 1 Load Regulation ............................................................................5 Layout of the Evaluation Boards..................................................... 1 Dropout Voltage ............................................................................5 Revision History ............................................................................... 2 Ground Current Measurements ......................................................6 Evaluation Board Hardware and Schematics ................................ 3 Ground Current Consumption ...................................................7 Evaluation Board Configurations .............................................. 3 Bill of Materials ..................................................................................8 Output Voltage Measurements ....................................................... 4 REVISION HISTORY 4/13—Revision 0: Initial Version Rev. 0 | Page 2 of 8 Evaluation Board User Guide UG-412 EVALUATION BOARD HARDWARE AND SCHEMATICS VOUT = −1.22 V × (1 + R1/R2). With the values shown in Figure 3 and Figure 4, the output voltage is approximately −15 V. EVALUATION BOARD CONFIGURATIONS The ADP7182 evaluation boards come supplied with different components, depending on which version of the board is ordered. Components common to both versions are C1, C2, LK1, and LK2. For −1.22 V fixed output voltage operation, LK2 can be inserted or a 0 Ω resistor can be installed for R1. Figure 4 shows the schematic of this evaluation board configuration. The ADP7182 is rated for output currents of up to −200 mA. Resistors R1 and R2 are used to set the output voltage of the adjustable output option. The output voltage is set by TP3 TP1 7 2.2µF VIN 8 VIN ADJ/NC GND VOUT VOUT VIN EPAD 4 EN TP2 3 2 VOUT 1 1 C1 EN NC 1 5 6 1 U1 1 CNR LK2 1 Way Link R1 133k C2 2.2µF J2 2 EPAD ADP7182 J1 1 Way Link 2 1 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 RNR R2 12k LK1 CON4 CON4 CON4 CON4 10708-004 CON8 CON8 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 J6 J5 J4 J3 Figure 3. LFCSP Evaluation Board Schematic TP1 TP2 1 2 VIN 2.2µF VOUT VIN CNR EN ADJ/NC LK2 1 Way Link R1 133k 4 2 3 5 OUT GND 1 C1 1 1 U1 EN RNR ADP7182 TP3 R2 12k LK1 2.2µF J2 1 2 3 4 5 6 7 8 CON8 J3 1 2 3 4 CON8 CON4 1 2 3 4 1 2 3 4 1 2 3 4 CON4 J6 J5 J4 CON4 CON4 10708-003 1 2 3 4 5 6 7 8 1 Way Link 2 1 1 J1 C2 Figure 4. TSOT Evaluation Board Schematic Table 1. Evaluation Board Hardware Components Component U1 1 C1 C2 R1 Function Linear regulator Input capacitor Output capacitor Output divider R2 Output divider RNR CNR LK1, LK2 Noise reduction Noise reduction Jumper 1 Description ADP7182 linear regulator. 2.2 μF input bypass capacitor. 2.2 μF output capacitor. Required for stability and transient performance. Part of the external resistor divider (composed of R1 and R2) that sets the output voltage for the adjustable option; VOUT = −15 V with the values shown in Figure 3 and Figure 4. Part of the external resistor divider (composed of R1 and R2) that sets the output voltage for the adjustable option; VOUT = −15 V with the values shown in Figure 3 and Figure 4. Forms the noise reduction network (composed of RNR and CNR) for the adjustable option. Forms the noise reduction network (composed of RNR and CNR) for the adjustable option. LK1 connects EN to VIN for automatic startup. To achieve −1.22 V with the adjustable output option, LK2 must be installed to connect the ADJ pin to the output. Component varies depending on the version of the evaluation board. Rev. 0 | Page 3 of 8 UG-412 Evaluation Board User Guide OUTPUT VOLTAGE MEASUREMENTS VOLTMETER VOLTAGE SOURCE 1.99711 – + + – 10708-005 LOAD Figure 5. Output Voltage Measurements, LFCSP VOLTMETER VOLTAGE SOURCE 1.99711 – – LOAD 10708-006 + + Figure 6. Output Voltage Measurements, TSOT Rev. 0 | Page 4 of 8 Evaluation Board User Guide UG-412 Figure 5 and Figure 6 show how the evaluation board can be connected to a voltage source and a voltmeter for basic output voltage accuracy measurements. A resistor can be used as the load for the regulator. Ensure that the resistor has a power rating that is adequate for handling the power expected to be dissipated across it. An electronic load can also be used as an alternative. Ensure that the voltage source can supply enough current for the expected load levels. Use the following steps to connect the evaluation board to a voltage source and voltmeter: –14.80 –14.85 4. 5. –14.95 –15.20 –15.25 –15.30 –200 –100 –50 0 DROPOUT VOLTAGE For line regulation measurements, the output of the regulator is monitored while its input is varied. For good line regulation, the output must change as little as possible with varying input levels. To ensure that the device is not in dropout during this measurement, VIN must be varied between VOUTNOM − 1 V (or −2.7 V, whichever is greater) and VINMAX. For example, for an adjustable ADP7182 set to −15 V, VIN must be varied between −16 V and −28 V. This measurement can be repeated under different load conditions. Figure 7 shows the typical line regulation performance of an ADP7182 with a −15 V output. The dropout voltage can be measured using the configurations shown in Figure 5 and Figure 6. The dropout voltage is defined as the input-to-output voltage differential when the input voltage is set to the nominal output voltage. This applies only for output voltages less than −3 V. The dropout voltage increases with larger loads. For more accurate measurements, use a second voltmeter to monitor the input voltage across the input capacitor. The input supply voltage may need to be adjusted to account for IR drops, especially if large load currents are used. Figure 9 shows a typical curve of dropout voltage measurements with different load currents. 0 –14.80 –20 DROPOUT VOLTAGE (mV) LOAD = 100µA LOAD = 1mA LOAD = 10mA LOAD = 50mA LOAD = 100mA LOAD = 200mA –15.00 –15.05 –15.10 –15.15 –40 –60 –80 –100 –120 –15.20 –140 –15.25 –15.30 –30 1 10 100 ILOAD (mA) –25 –20 VIN (V) –15 10708-007 VOUT (V) –150 Figure 8. Output Voltage vs. Load Current LINE REGULATION –14.95 –15.10 ILOAD (mA) If the load current is large, connect the voltmeter as close as possible to the output capacitor to reduce the effects of IR drops. –14.90 –15.05 –15.15 The voltage source can then be turned on. If LK1 is inserted (connecting EN to VIN for automatic startup), the regulator powers up. –14.85 –15.00 Figure 7. Output Voltage vs. Input Voltage Rev. 0 | Page 5 of 8 Figure 9. Dropout Voltage vs. Load Current 1000 10708-009 3. –14.90 10708-008 Connect the positive terminal (+) of the voltage source to one of the GND pads on the evaluation board. Connect the negative terminal (−) of the voltage source to the VIN pad of the evaluation board. Connect a load between the VOUT pad and one of the GND pads. Connect the positive terminal (+) of the voltmeter to one of the GND pads. Connect the negative terminal (−) of the voltmeter to the VOUT pad. 2. For load regulation measurements, the output of the regulator is monitored while the load is varied. For good load regulation, the output must change as little as possible with varying load. The input voltage must be held constant during this measurement. The load current can be varied from 0 mA to −200 mA. Figure 8 shows the typical load regulation performance of an ADP7182 with a −15 V output for an input voltage of −16 V. VOUT (V) 1. LOAD REGULATION UG-412 Evaluation Board User Guide GROUND CURRENT MEASUREMENTS AMMETER VOLTAGE SOURCE 0.00112 – + + – 10708-010 LOAD Figure 10. Ground Current Measurements, LFCSP AMMETER VOLTAGE SOURCE 0.00112 + + – LOAD 10708-011 – Figure 11. Ground Current Measurements, TSOT Rev. 0 | Page 6 of 8 Evaluation Board User Guide UG-412 Use the following steps to connect the evaluation board to a voltage source and ammeter: 2. 3. 4. Connect the negative terminal (−) of the voltage source to the VIN pad on the evaluation board. Connect the negative terminal (−) of the ammeter to one of the GND pads of the evaluation board. Connect the positive terminal (+) of the ammeter to the positive terminal (+) of the voltage source. Connect a load between the positive terminal (+) of the voltage source and the VOUT pad of the evaluation board. The voltage source can then be turned on. If LK1 is inserted (connecting EN to VIN for automatic startup), the regulator powers up. Ground current measurements can determine how much current the regulator’s internal circuits are consuming while the circuits perform the regulation function. To be efficient, the regulator needs to consume as little current as possible. Typically, the regulator uses the maximum current when supplying its largest load level (−200 mA). Figure 12 shows the typical ground current consumption for various load levels at an input voltage of −16 V for an output voltage of −15 V. 0 –100 –200 –300 –400 –500 –600 –700 –800 –200 –150 –100 –50 ILOAD (mA) 0 10708-012 1. GROUND CURRENT CONSUMPTION GROUND CURRENT (µA) Figure 10 and Figure 11 show how the evaluation board can be connected to a voltage source and an ammeter for ground current measurements. A resistor can be used as the load for the regulator. Ensure that the resistor has a power rating that is adequate for handling the power expected to be dissipated across it. An electronic load can be used as an alternative. Ensure that the voltage source used can supply enough current for the expected load levels. Figure 12. Ground Current vs. Load Current When the device is disabled (EN = GND), the ground current drops to less than −2 µA. Rev. 0 | Page 7 of 8 UG-412 Evaluation Board User Guide BILL OF MATERIALS Table 2. Qty 1 2 2 1 1 Reference Designator U1 C1, C2 LK1, LK2 R1 R2 Description ADP7182 Capacitor, MLCC, 2.2 μF, 50 V, 1206, X5R Header, single, STR, two pins 133k/1% resistor for setting output voltage 12k/1% resistor for setting output voltage Manufacturer/Vendor Analog Devices, Inc. Murata (or equivalent) Sullins Connector Solutions Vendor Part Number ADP7182ACPZ/ADP7182AUJZ GRM31CR61H225KA88 PEC02SAAN ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. 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