TIDUEY5 January   2021

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
    3. 3.3 Test Results
  9. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools and Software
    3. 4.3 Support Resources
    4. 4.4 Trademarks
  10. 5About the Author

2 System Overview

Table 2-1 lists the key system specifications of this design.

Table 2-1 Key System Specifications
ParameterConditionsSpec RangeUnit
MinimumTypicalMaximum
Cell architectureBQ769423 10Series
BQ7691423 14Series
BQ769523 16Series
Cell balancing peak currentCell voltage: 4000 mV 117 mA
Charge current 27A
Discharge current 27A
Pre-discharge currentPack voltage: 48 V 160 mA
Cell Voltage accuracy25°C ±5mV
0°C–60°C ±10mV
Pack current accuracy< 2 A ±10 mA
> 2 A ±0.5 %
Primary OV protectionThreshold 4200 mV
Delay 2 s
Secondary OV protectionThreshold 4325 mV
Delay 1 s
Primary UV protectionThreshold 2530 mV
Delay 2 s
Secondary UV protectionThreshold 2250 mV
Delay 1 s
OCD protection - level 1Threshold 10 A
Delay 425 ms
OCD protection - level 2Threshold 30 A
Delay 56 ms
OCC protectionThreshold 10 A
Delay 425 ms
SCD protectionThreshold 200 A
Delay 300 µs
Over temperature protectionCharge 55 °C
Discharge 60 °C
Under temperature protectionCharge 0 °C
Discharge –20 °C
Maximum pack+ voltageCharge MOSFET off 120V
Standby mode current consumption 100 µA
Ship mode current consumption 10 µA