TI’s bq76PL536-Q1 is a 3-6 lithium-ion battery” title=”lithium-ion battery”>Li-ion battery monitor and secondary protection integrated circuit, the device integrates a high-precision ADC, with an accuracy of ±1 mV, 14-bit Resolution, 6us conversion time, with hot-insertion and high-speed SPI data communication, mainly used in electric and hybrid vehicles, electric bicycles, UPS and high-capacity battery systems. This article introduces the bq76PL536-Q1 main features, block diagram, reference application circuit As well as bq76PL536-3 evaluation module features, single-supply and three-supply connection diagrams and bq76PL536 system application block diagram.
3 to 6 Series Cell Lithium-Ion Battery Monitor and Secondary Protection IC for EV and HEV Applications
The bq76PL536-Q1 is a stackable three to six series cell lithium-ion battery pack protector and analog front end (AFE) that incorporates a precision analog-to-digital converter (ADC); independent cell voltage and temperature protection; cell balancing, and a precision 5-V regulator to power user circuitry.
The bq76PL536-Q1 integrates a voltage translation and precision analog-to-digital converter system to measure battery cell voltages with high accuracy and speed.
The bq76PL536-Q1 provides full protection (secondary protection) for overvoltage, undervoltage, and overtemperature conditions. When safety thresholds are exceeded, the bq76PL536-Q1 sets the FAULT output. No external components are needed to configure or enable the protection features.
Main features of bq76PL536-Q1:
3 to 6 Series Cell Support, All Chemistries
Hot-Pluggable
High-Speed SPI for Data Communications
Stackable Vertical Interface
No Isolation Components Required Between ICs
Qualified for Automotive Applications
Temperature Range –40℃ to 105℃
High-Accuracy Analog-to-Digital Converter (ADC):
±1 mV Typical Accuracy
14-Bit Resolution, 6-µs Conversion Time
Nine ADC Inputs: 6 Cell Voltages, 1 Six-Cell Brick Voltage,
2 Temperatures, 1 General-Purpose Input
Dedicated Pins for Synchronizing Measurements
Configuration Data Stored in ECC-OTP Registers
Built-In Comparators (Secondary Protector) for:
Over- and Undervoltage Protection
Overtemperature Protection
Programmable Thresholds and Delay Times
Dedicated Fault Output Signals
Cell Balancing Control Outputs With Safety Timeout
Balance Current Set by External Components
bq76PL536-Q1 application:
Electric and Hybrid Electric Vehicles
E-Bike and E-Scooter
Uninterruptible Power Systems (UPS)
Large-Format Battery Systems
figure 1. bq76PL536-Q1 block diagram
figure 2. bq76PL536-Q1 Simplified System Connection Block Diagram
image 3. bq76PL536-Q1 Reference Application Circuit (1)
Figure 4. bq76PL536-Q1 Reference Application Circuit (2)
Figure 5. bq76PL536-Q1 Reference Application Circuit (3)
Image 6. bq76PL536-Q1 Reference Application Circuit (4)
bq76PL536-3 evaluation module
Evaluation Module for BQ76PL536 Lithium-Ion Battery Monitor and Secondary Protection IC
The User’s Guide for bq76PL536EVM-3 covers the initial connection and installation of the Texas Instruments bq76PL536 Evaluation Module (EVM), supplied in kit form including the EVM board, the USB-SPI adapter, and connectors to make cells-to-EVM connection. It is not meant as a comprehensive guide to using the ‘536 integrated circuit and its’ features.
Figure 7. bq76PL536-3 Evaluation Module Outline Drawing
Figure 8. Connection diagram of three ~20V power supplies for the bq76PL536-3 evaluation module
Figure 9. bq76PL536-3 evaluation module single 54V power supply connection diagram
Figure 10. bq76PL536 system application block diagram
For details, see:
http://focus.ti.com/lit/ds/symlink/bq76pl536-q1.pdf
and
http://focus.ti.com/lit/ug/sluu437a/sluu437a.pdf
The Links: SKIIP2403GB172-4DL F4-200R06KL4