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bq24740/1EVM (HPA206) For Multicell Synchronous
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Introduction
1.1
EVM Features
• Evaluation module for bq24740/1
• High-efficiency NMOS-NMOS synchronous buck charger with 300-kHz frequency
• Battery/adapter to system power selector function
• User-selectable 2-cell, 3-cell, or 4-cell Li-ion battery voltage
• User-programmable battery regulation voltage with external voltage source (4.2/cell by default)
• User-programmable charge current with external voltage source (3 A by default)
• User-programmable input current limit with external voltage source (4.5 A for bq24740, 4 A for
bq24741 by default)
• Pin-programmable interface for control and status communications with host
• AC adapter operating range 18 V to 22 V
• 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
SLUU284A - June 2007 - Revised October 2008
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bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger
SLUU284A - June 2007 - Revised October 2008
Notebook Charger
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List of Figures
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User's Guide
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Summary of Contents for Texas Instruments bq24740/1EVM
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Page 1: Table Of Contents
• 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 SLUU284A – June 2007 – Revised October 2008 bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger Submit Documentation Feedback... - Page 2 CHGEN pin for bq24740, CE pin for bq24741 J11–IADSLP IADSLP pin or bq24740, TRICKLE pin for bq24741 J11–CELLS CELLS pin J12–VADJ VADJ pin bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger SLUU284A – June 2007 – Revised October 2008 Submit Documentation Feedback...
- Page 3 The conduction of the battery MOSFET is indicated by LED when on. Jumper On IADSLP pulled to high when on for bq24740, TRICKLE pulled to high when on for Jumper Off bq24741 SLUU284A – June 2007 – Revised October 2008 bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger Submit Documentation Feedback...
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Page 4: Test Summary
A,B Observe if A, B occur. If they do not occur, the unit under test has failed. Assembly drawings have location for jumpers, test points and individual components. bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger SLUU284A – June 2007 – Revised October 2008... - Page 5 J19: OFF, J13 (CELLS, GND): ON, J15: ON, J17: ON, J18: ON. J20: ON (for bq24740 only), OFF (For bq24741 only). After the preceding steps, the test setup for HPA206 (bq24740EVM) is shown in Figure SLUU284A – June 2007 – Revised October 2008 bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger Submit Documentation Feedback...
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Page 6: Original Test Setup For Hpa206 (Bq24740Evm)
2. Install J13 (CELLS, VPULUP) Measure → V(J8(BAT)) = 16.8 V ±200 mV 3. Install J13(CELLS, GND) Measure → V(J8(BAT)) = 12.6 V ±200 mV bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger SLUU284A – June 2007 – Revised October 2008 Submit Documentation Feedback... -
Page 7: Test Setup For Hpa206 (Bq24740Evm)
Measure → V(J8(SYS)) = 10.5 V ±1 V (battery connected to system) 5. Observe → D2(BYPASS) off, D3 (ACDRV off, D4 (BATDRV) on. SLUU284A – June 2007 – Revised October 2008 bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger Submit Documentation Feedback... -
Page 8: Pcb Layout Guideline
160-1181-1-ND Lite On 20-mA, 20-mcd MBRS130TR Diode, Schottky, 1A, 30V MBRS130TR D120/2DS Terminal Block, 2-pin, 15-A, 0.40 x 0.35 inch D120/2DS 5.1mm bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger SLUU284A – June 2007 – Revised October 2008 Submit Documentation Feedback... - Page 9 R36, R38, R39, R41, R37, R40, Resistor, Chip, 1/16W, 5% 0603 Resistor, Chip, 1/10W, 0.1% 0805 66.5K Resistor, Chip, 1/10W, 0.1% 0805 SLUU284A – June 2007 – Revised October 2008 bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger Submit Documentation Feedback...
- Page 10 3. These assemblies must comply with workmanship standards IPC-A-610 Class 2. 4. Ref designators marked with an asterisk ('**') cannot be substituted. All other components can be substituted with equivalent MFG's components. bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger SLUU284A – June 2007 – Revised October 2008 Submit Documentation Feedback...
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Page 11: Top And Silk Layer
Bill of Materials, Board Layout, and Schematics www.ti.com Board Layout Figure 3. Top and Silk Layer SLUU284A – June 2007 – Revised October 2008 bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger Submit Documentation Feedback... -
Page 12: Second Layer
Bill of Materials, Board Layout, and Schematics www.ti.com Figure 4. Second Layer bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger SLUU284A – June 2007 – Revised October 2008 Submit Documentation Feedback... -
Page 13: Third Layer
Bill of Materials, Board Layout, and Schematics www.ti.com Figure 5. Third Layer SLUU284A – June 2007 – Revised October 2008 bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger Submit Documentation Feedback... -
Page 14: Bottom Layer
Bill of Materials, Board Layout, and Schematics www.ti.com Figure 6. Bottom Layer bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger SLUU284A – June 2007 – Revised October 2008 Submit Documentation Feedback... -
Page 15: Bottom Assembly
Bill of Materials, Board Layout, and Schematics www.ti.com Figure 7. Bottom Assembly SLUU284A – June 2007 – Revised October 2008 bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger Submit Documentation Feedback... -
Page 16: Top Assembly
Bill of Materials, Board Layout, and Schematics www.ti.com Figure 8. Top Assembly bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger SLUU284A – June 2007 – Revised October 2008 Submit Documentation Feedback... - Page 17 Bill of Materials, Board Layout, and Schematics www.ti.com Schematics SLUU284A – June 2007 – Revised October 2008 bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger Submit Documentation Feedback...
- Page 18 Bill of Materials, Board Layout, and Schematics www.ti.com bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger SLUU284A – June 2007 – Revised October 2008 Submit Documentation Feedback...
- Page 19 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.
- Page 20 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
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