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User's Guide

SLUU410–February 2010

bq24600/20/40 EVM (HPA421) Multi Cell Synchronous

Switch-Mode Charger

Contents

1 Introduction .................................................................................................................. 2

1.1 EVM Features ...................................................................................................... 2

1.2 General Description ................................................................................................ 2

1.3 I/O Description ...................................................................................................... 2

1.4 Controls and Key Parameters Setting ........................................................................... 3

2 Test Summary ............................................................................................................... 4

2.1 Definitions ........................................................................................................... 4

2.2 Equipment ........................................................................................................... 4

2.3 Equipment Setup ................................................................................................... 5

2.4 Procedure ........................................................................................................... 5

3 PCB Layout Guideline ...................................................................................................... 7

4 Board Layout ................................................................................................................ 8

5 Schematics ................................................................................................................. 13

6 Bill of Materials ............................................................................................................. 14

List of Figures

1 Original Test Setup for HPA421 (bq24600/20/40 EVM) ............................................................... 5

2 Top Layer .................................................................................................................... 8

3 2nd Layer .................................................................................................................... 8

4 3rd Layer ..................................................................................................................... 9

5 Bottom Layer ................................................................................................................ 9

6 Top Assembly.............................................................................................................. 10

7 Bottom Assembly .......................................................................................................... 11

8 Top Silkscreen ............................................................................................................. 12

9 bq246xx EVM Schematic (Sheet 1 of 1) ............................................................................... 13

List of Tables

1 I/O description ............................................................................................................... 2

2 Controls and Key Parameters Setting.................................................................................... 3

3 Recommended Operating Conditions.................................................................................... 3

4 Bill of Materials............................................................................................................. 14

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SLUU410–February 2010 bq24600/20/40 EVM (HPA421) Multi Cell Synchronous Switch-Mode Charger

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Summary of content (17 pages)

PAGE 1
User's Guide SLUU410 – February 2010 bq24600/20/40 EVM (HPA421) Multi Cell Synchronous Switch-Mode Charger 1 2 3 4 5 6 Contents Introduction .................................................................................................................. 2 1.1 EVM Features ...................................................................................................... 2 1.2 General Description ................................................................................................ 2 1.
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Introduction www.ti.com 1 Introduction 1.1 EVM Features • • • • • • • 1.2 Evaluation Module for bq24600/bq24620/bq24640 High Efficiency Synchronous Buck Charger User-programmable up to 26V Battery Voltage AC Adapter Operating Range 5V–28V LED Indication for Control and Status Signals. Test Points for Key Signals Available for Testing Purpose. Easy Probe Hook-up. Jumpers Available. Easy to Change Connections.
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Introduction www.ti.com Table 1. I/O description (continued) 1.4 Jack Description JP2 – ACDRV ACDRV net JP2 – ACDRV_IN Internal ACDRV signal JP3 – VEXT External power supply from J4 JP3 – PULLUP Pull-up voltage source JP3 – VREF IC reference voltage VREF JP4 – CHGEN Charge-enable signal JP4 – GND Ground JP5 – LEDPWR LED Pull-up power line JP5 – VPULLUP Pull-up voltage source from JP3 Controls and Key Parameters Setting Table 2.
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Test Summary 2 Test Summary 2.1 Definitions www.ti.com This procedure details how to configure the HPA421 evaluation board. On the test procedure the following naming conventions are followed. See the HPA421 schematic for details. VXXX : LOADW: V(TPyyy): V(Jxx): V(TP(XXX)): V(XXX, YYY): I(JXX(YYY)): Jxx(BBB): Jxx ON : Jxx OFF: Jxx (-YY-) ON: Measure:→A,B Observe → A,B External voltage supply name (VADP, VBT, VSBT) External load name (LOADR, LOADI) Voltage at internal test point TPyyy.
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Test Summary www.ti.com 2.3 Equipment Setup (A) Set the power supply #1 for 0V ± 100mVDC, 5 ± 0.1A current limit and then turn off supply. (B) Connect the output of power supply #1 in series with a current meter (multimeter) to J1 (VIN, GND). (C) Connect a voltage meter across J1 (VIN, GND). (D) Set the power supply #2 for 0V ± 100mVDC, 1 ± 0.1A current limit and then turn off supply. (E) Connect the output of the power supply #2 to J3 (TS, GND).
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Test Summary www.ti.com 2.4.2 CHARGER REGULATION VOLTAGE 1. Increase the voltage of PS#1 until V(J1(VIN)) = 24V ± 0.1V. Measure → V(J3(BAT, GND)) = 0V ± 1V 2. Put JP4 on. Measure → Peak V(J3(BAT)) = 21V ± 1V (bq24600) Measure → Peak V(J3(BAT)) = 18V ± 1V (bq24620) Measure → Peak V(J3(BAT)) = 19.8V ± 1V (bq24640) Measure → V(TP(REGN)) = 6V ± 500mV Observe → D5(CHGEN) on; D7(STAT) blink; D6 (PG) on. (bq24600/20) Observe → D5(CHGEN) on; D7(STAT) on; D6 (PG) on. (bq24640) 2.4.3 CHARGE CURRENT 1.
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PCB Layout Guideline www.ti.com 2.4.5 POWER PATH SELECTION 1. Take JP4 off (Disable the charging) Observe → D5(CHGEN) off; D7 (STAT) blink. 2. Set JP3 Jumper On 2-3 (VPULLUP and VEXT). Connect the output of the power supply #3 to J2(VEXT, GND). Set the power supply #3 for 3.3V ± 200mVDC, 1 ± 0.1A current limit. 3. Set Load #2 at 16.5V ± 500mV. Measure → V(J3(SYS)) = 24V ±1mV (adapter connected to system) Measure → ACDRV = 9V ± 2V; BATDRV = 24V ± 1V Observe → D6(PG) on. 4. Turn off PS#1 5.
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Board Layout 4 www.ti.com Board Layout Figure 2. Top Layer Figure 3.
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Board Layout www.ti.com Figure 4. 3rd Layer Figure 5.
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Board Layout www.ti.com Figure 6.
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Board Layout www.ti.com Figure 7.
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Board Layout www.ti.com Figure 8.
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Schematics www.ti.com 5 Schematics Figure 9.
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Bill of Materials 6 www.ti.com Bill of Materials Table 4. Bill of Materials bq24600 -001 bq24620 -002 bq24640 -003 1 0 0 14 RefDes Value Description Size Part Number MFR 0 U1 BQ24600RVA IC, 28V Synchronous Switchmode Charge Management QFN16[RVA] BQ24600RVA TI 1 0 U1 BQ24620RVA IC, 28V Synchronous Switchmode Charge Management QFN16[RVA] BQ24620RVA TI 0 0 1 U1 BQ24640RVA IC, 28V Synchronous Switchmode Charge Management QFN16[RVA] BQ24640RVA TI 6 6 6 C1,C12,C14,C15 0.
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Bill of Materials www.ti.com Table 4. Bill of Materials (continued) bq24600 -001 bq24620 -002 bq24640 -003 RefDes Value Description Size Part Number MFR 1 0 0 1 1 R10 9.31K Resistor, Chip, 1/16W, 1% 402 Std Std 0 R10 2.2K Resistor, Chip, 1/16W, 1% 402 Std 1 Std 0 1 R11 430K Resistor, Chip, 1/16W, 1% 402 Std Std 0 1 0 R11 6.
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Bill of Materials www.ti.com Table 4. Bill of Materials (continued) bq24600 -001 bq24620 -002 bq24640 -003 8 8 4 16 RefDes Value Description Size Part Number MFR 8 TP5, TP15, TP16, TP18–TP22 CHGEN,ISET,REGN Test Point, White, Thru Hole Color Keyed ,STAT,TS,VCC,VRE F,~PG 0.100 x 0.100 inch 5002 Keystone 4 4 TP9–TP11,TP14 131-4244-00 Adaptor, 3.5-mm probe clip (or 131-5031-00) 0.200 inch 131-4244-00 Tektronix 1 1 1 Q7 2N7002DICT MOSFET, N-ch, 60-V, 115-mA, 1.
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Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.