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Evaluation Board User Guide

UG-456

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

Evaluation Board for the ADP2442 36 V, 1 A, Synchronous, Step-Down DC-to-DC

Regulator with External Clock Synchronization

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 12

FEATURES

Full featured evaluation board for the ADP2442

Configurable synchronous step-down dc-to-dc switching

regulator

Operating voltage range: V

= 6 V to 36 V

Output voltage: 5 V or adjustable

1 A maximum load

Switching frequency: 500 kHz or adjustable switching

frequency of 300 kHz to 1 MHz

Power saving mode at light load

Precision enabled input pin

Current limit protection

Power good output

SYNC/MODE pin for external synchronization or mode

selection

53 mm × 53 mm board size

DOCUMENTS NEEDED

ADP2442 data sheet

UG-407 user guide

GENERAL DESCRIPTION

The ADP2442-EVA L Z evaluation board is a complete, dc-to-dc

switching regulator design based on the ADP2442, a configurable,

1 A, synchronous, step-down dc-to-dc regulator.

The ADP2442 is a synchronous, step-down dc-to-dc switching

regulator that uses a current mode pulse-width modulation

(PWM) control scheme. The ADP2442 can be configured for

pulse skip mode at light load or forced PWM mode. The power

switch and synchronous rectifier are integrated for minimal

external part count and high efficiency. The ADP2442 is

optimized for operation with small ferrite core inductors and

ceramic capacitors to deliver the maximum output power per

square millimeter of the printed circuit board (PCB) area.

The ADP2442-EVA L Z is available with 5 V at a 1 A output, with

a switching frequency set to 500 kHz. If needed, the ADP2442-

EVA LZ configuration can be modified by changing the values

of the appropriate passive components.

Complete specifications for the ADP2442 device can be found

in the ADP2442 data sheet, which is available from Analog

Devices, Inc., and should be consulted in conjunction with this

user guide when using the evaluation board.

ADP2442-EVALZ

Figure 1.

10949-001

Summary of content (12 pages)

PAGE 1
Evaluation Board User Guide UG-456 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.
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UG-456 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Modifying the Evaluation Board .....................................................5 Documents Needed .......................................................................... 1 Changing the Output Voltage ......................................................5 General Description ...............................................................
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Evaluation Board User Guide UG-456 USING THE EVALUATION BOARD PGOOD Signals Input Power Source The power source voltage must not exceed 36 V, the maximum operation input voltage of the ADP2442. Ensure that the power source is switched off before connecting it to the ADP2442-EVALZ evaluation board. Connect the positive terminal of the power source to the evaluation board VIN terminal (T1), and the negative terminal of the power source to the evaluation board GND terminal (T2).
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UG-456 Evaluation Board User Guide MEASURING EVALUATION BOARD PERFORMANCE η= Output Voltage Ripple To observe the output voltage ripple, place an oscilloscope probe tip at the T3 terminal and connect the probe ground lead at the negative (−) the T4 terminal. Set the oscilloscope to an ac-coupled, 100 mV/division and 2 µs/division time base.
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Evaluation Board User Guide UG-456 MODIFYING THE EVALUATION BOARD When the output voltage of the ADP2442-EVALZ is changed, the output capacitors (C7 and C8), inductor (L1), and compensation components (R5 and C10) must be recalculated and changed to ensure stable operation according to the Applications Information section in the ADP2442 data sheet. The ADP2442-EVALZ evaluation board is provided fully assembled and tested for proper operation. The evaluation board has a fixed 5 V output voltage.
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UG-456 Evaluation Board User Guide TYPICAL PERFORMANCE CHARACTERISTICS 5.06 100 VIN = 12V VIN = 24V VIN = 36V 90 80 5.04 70 EFFICIENCY (%) NO LOAD LOAD 1A 5.05 5.03 VOUT (V) 60 50 5.02 5.01 40 5.00 30 4.99 20 0.1 4.97 10949-005 0 0.01 1 LOAD (A) 7 12 17 22 27 32 37 10949-008 4.98 10 42 VIN (V) Figure 4. Efficiency vs. Load Current, VOUT = 5 V, fSW = 500 kHz, Pulse Skip Mode Figure 7.
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Evaluation Board User Guide UG-456 VOUT 1 ENABLE 3 LOAD STEP 500mA 4 VOUT 1 SW SW CH1 100mV B CH2 10V M200µs A CH4 CH4 500mA Ω T 71.2% W 720mA CH1 2V CH3 5V CH2 10V W B W M1ms A CH1 T 52.4% 1.52V Figure 13. Shutdown, VIN = 24 V, VOUT = 5 V, Load 5 Ω Figure 10. Load Transient, VIN = 24 V, VOUT = 5 V, 500 mA Step VOUT VOUT 1 B 10949-014 2 10949-011 2 1 SW LOAD STEP 500mA 2 4 SYNC SW 800mA CH1 50mV CH3 2V Figure 11.
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UG-456 Evaluation Board User Guide EVALUATION BOARD SCHEMATIC AND ARTWORK 10949-017 Figure 16. ADP2442-EVALZ Evaluation Board Schematic Rev.
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UG-456 Figure 17. ADP2442-EVALZ Evaluation Board Top Layer 10949-020 10949-018 Evaluation Board User Guide 10949-019 10949-021 Figure 19. ADP2442-EVALZ Evaluation Board Second Layer Figure 20. ADP2442-EVALZ Evaluation Board Bottom Layer Figure 18. ADP2442-EVALZ Evaluation Board Third Layer Rev.
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UG-456 Evaluation Board User Guide ORDERING INFORMATION BILL OF MATERIALS Table 4. Quantity 2 2 1 2 1 1 1 1 2 1 1 1 1 1 2 1 4 1 1 4 1 Reference Designator C1, C2 C3, C4 C5 C7, C8 L1 C6 C10 R1 R3, R8 R7 R2 R5 R6 R9 IN, OUT J1 SYNC TP1, TP2, TP3, TP4 JP1 PGOOD JP2 SYNC T1, T2, T3, T4 U1 Description Capacitor MLCC, 4.
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Evaluation Board User Guide UG-456 NOTES Rev.
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UG-456 Evaluation Board User Guide NOTES 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.