Texas Instruments bq2400 Series User Manual Download Page 10

Test Procedures

2-3

Test Summary

Note:

V

I

 for a single cell should not exceed 5.3 VDC for the 1-A charge rate and

7.6 V for the .5-A charge rate.

Adjust the input power supply for 5 V.  The red LED should illuminate to indicate
charging, unless there is a fault or the battery is fully charged.

The bq2400x enters preconditioning mode if the battery is below the LowV
threshold. In this mode, the bq2400x trickle-charges with approximately
65 mA for approximately 23 minutes. If the battery does not reach the LowV
threshold after this period, then the charge current is terminated and the
bq2400x enters fault mode. The red LED flashes when in fault mode. This
feature may be tested in the .5-A charge mode by using a 5-

, 3-W resistor

in place of the battery. Fault mode is reset by toggling input power or enable
pin.

Once the battery charges to the LowV-stop threshold, the battery enters fast
charge mode and charges at the selected I

CHG

 level (0.5-1 A).

The battery remains at the fast-charge mode until either the selected time
expires or the battery charges to the selected regulation voltage.

The time-out feature may be tested in the 0.5-A charge mode by using a 7 

,

3-W resistor in place of the battery. Apply the resistor after the unit is powered.

If the battery discharges down to the HighV threshold, the charger starts fast
charging. The refresh feature may be tested in the 0.5-A charge mode by using
a 7-

Ω,

 3-W resistor in parallel with a fully charged battery.

The circuit has an overvoltage comparator for added protection.  If the battery
voltage exceeds this threshold for 330 ms, then the charger goes into fault
mode. This may be tested by connecting an external power supply in place of
the battery and adjusting the voltage above the threshold.

2.2.2

For Two-Cell Applications

Set up the evaluation board as described above, by making the necessary I/O
connections and jumper selections.

Note:

Before test and evaluation, it is important to verify that the maximum power
dissipation on the IC is not exceeded. P

max

 = 2.3 W.

P

diss, 2 cell

 = (V

I

 – 6.8 V) 

×

 I

CHG

      where V

I

 = V

CC

 –0.1 V

Note:

With a two-cell battery pack at 6 V,  charging at 1 A,  the IC power dissipation
is temporarily as high as 3.1 W until the pack charges to 6.8 V. This condition
is acceptable for the short time before the pack reaches 6.8 V.

Adjust the input power supply for 9.1 V.  The red LED should illuminate to
indicate charging, unless there is a fault or the battery is fully charged.

Summary of Contents for bq2400 Series

Page 1: ...July 2002 Advanced Analog Products User s Guide SLUU083A...

Page 2: ...t that any license either express or implied is granted under any TI patent right copyright mask work right or other TI intellectual property right relating to any combination machine or process in wh...

Page 3: ...charger which delivers up to 1 2 A of continuous charge current for one or two cell applications How to Use This Manual This document contains the following chapters Chapter 1 Introduction Chapter 2...

Page 4: ...lications 2 2 2 2 2 For Two Cell Applications 2 3 3 Physical Layouts 3 1 3 1 Board Layout 3 2 4 Bill of Materials 4 1 4 1 Bill of Materials 4 2 4 2 bq2400x Charge Status Configurations 4 3 A Schematic...

Page 5: ...Li ion bq2400x charge management solution for one and two cell battery pack applications This guide describes a complete designed and tested charger which delivers up to 1 0 A of continu ous charge c...

Page 6: ...tage phase The user can configure the device for cells with either coke or graphite anodes Charge is terminated by either of the following methods Maximum time Minimum current detection 1 2 Performanc...

Page 7: ...m fault High TBATMAX J2 set to Therm 43 48 53 C Therm fault Low TBATMIN J2 set to Therm 0 5 10 C APG user defined see data sheet J2 set to APG Power dissipation PD VI VO Iload 2 3 W VI for a 2 cell sh...

Page 8: ...2 1 Test Summary Test Summary This chapter shows the test setups used and the tests performed in designing the bq2400xEVM Topic Page 2 1 Setup 2 2 2 2 Test Procedures 2 2 Chapter 2...

Page 9: ...pers on J4 J4 0 5 A charge use two jumpers placed horizontally no jumpers on J3 J2 Adapter power good APD or battery s thermistor J5 Enable on or off J6 Regulation voltage 4 2 V or 4 1 V single cell 8...

Page 10: ...ed in the 0 5 A charge mode by using a 7 3 W resistor in place of the battery Apply the resistor after the unit is powered If the battery discharges down to the HighV threshold the charger starts fast...

Page 11: ...fast charge mode until either the selected time expires or the battery charges to the selected regulation voltage The timeout feature is tested in the 0 5 A charge mode by using a 14 5 W resistor in p...

Page 12: ...3 1 Physical Layouts Physical Layouts This chapter contains the board layout and assembly drawings for the SLUP051 EVM Topic Page 3 1 Board Layout 3 2 Chapter 3...

Page 13: ...oard Layout 3 2 3 1 Board Layout Figure 3 1 shows the top layer of the SLUP051 Figure 3 2 shows the bottom layer Figure 3 3 shows the SLUP051 top assembly view Figure 3 1 SLUP051 Board Layout Top Laye...

Page 14: ...Board Layout 3 3 Physical Layouts Figure 3 2 SLUP051 Board Layout Bottom Layer Figure 3 3 SLUP051 Top Assembly View...

Page 15: ...als This chapter contains the bill of materials required for the SLUP051 EVM It also specifies the charge status configurations for the bq2400x Topic Page 4 1 Bill of Materials 4 2 4 2 bq2400x Charge...

Page 16: ...Pin strip header 2 pin 3M 1 J9 ED350 3 ED1610 ND Terminal block 3 pin On shore 1 R1 CR0805 105113F Resistor 51 1 k 1 1 10W see Note 1 Venkel 805 1 R2 CR0805 10W3163JT Resistor 316 1 1 10W see Note 1 V...

Page 17: ...ns for the bq2400x Table 4 2 Charge Status Configurations Part Number Number of Cells Charge Status Configuration bq24001 Single cell Single LED bq24002 Single cell 2 LED bq24003 Single cell Bicolor L...

Page 18: ...A 1 Schematic Schematic This chapter contains the schematic diagram for the EVM Topic Page A 1 Schematic A 2 Appendix A...

Page 19: ...G VSEL EN APG THM ISNS VCC N C N C IN IN N C OUT OUT N C VCC VCC VCC A2 B2 B1 A1 2 1 GRN C A RED C A 2 1 3 2 1 EN JUMPER APG THM JUMPER APG MODE THERMISTOR MODE STAT 2 JUMPER SCHEMATIC ON OFF 4 1V 4 2...

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