SNOSCV7B – NOVEMBER 2011 – REVISED SEPTEMBER 2013
EMB1499Q Bidirectional Current DC-DC Controller
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FEATURES
60-V Maximum Stack Operating Voltage
Bidirectional Balancing Current
Fully Synchronous Operation
Active Clamp Signal
250-kHz Switching Frequency
Fault Detection Includes Two Separate UVLO
Cells (One for Each External Supply), Primary
and Secondary Side Current Limit, OVP/UVP
Sense on Cell Being Charged, Thermal
Shutdown, and Watchdog Timer
Balancing Current User-selectable Through
External Voltage
EMB1499Q is an Automotive Grade Product
that is AEC-Q100 Grade 1 Qualified (–40°C to
+125°C Operating Junction Temperature)
DESCRIPTION
The EMB1499Q bidirectional current dc/dc controller
IC works in conjunction with the EMB1428 switch
matrix gate driver IC to support TI’s switch matrix
based active cell balancing scheme for a battery
management system. The EMB1499Q provides three
PWM MOSFET gate signals to a bidirectional forward
converter so that its output current, either positive or
negative, is regulated around a user-defined
magnitude. This inductor current is channeled by the
EMB1428 through the switch matrix to the cell that
needs to be charged or discharged. In a typical
scheme, the EMB1499Q-based forward converter
exchanges energy between a single cell and the
battery stack to which it belongs, with a maximum
stack voltage of up to 60 V. The switching frequency
is fixed at 250 kHz. The EMB1499Q senses cell
voltage, inductor current and stack current and
provides protection from abnormal conditions during
balancing.
The EMB1499Q also provides an active clamp timing
signal to control an external FET driver for the
primary-side active clamp FET. The EMB1499Q is
enabled and disabled by the EMB1428. Fault
conditions detected by the EMB1499Q are
communicated to the EMB1428 through the DONE
and FAULT pins.
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APPLICATIONS
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Li-Ion Battery Management Systems
Hybrid and Electric Vehicles
Grid Storage
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011–2013, Texas Instruments Incorporated
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