Linear LTC2937, Руководство пользователя

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dc2313af
DEMO MANUAL DC2313A
Description
Programmable
Six Channel Sequencer and
Voltage Supervisor with EEPROM
Demonstration circuit 2313A showcases the LTC2937 , a
programmable six channel power supply sequencer and
voltage supervisor.
The LTC2937 provides flexible sequence control for up
to six power supplies. It enables and disables the sup-
plies with configurable sequence order and time delays,
monitors the supplies for power-up and power-down time,
and for overvoltage and undervoltage. It cooperates with
other LTC2937 parts in the system to coordinate power
sequencing activities. It provides flexible fault response to
autonomously supervise the power supplies, and powerful
debug tools to diagnose any problem that causes a power-
supply fault. It holds configuration in non-volatile EEPROM
for completely automatic power system supervision.
The DC2313A board demonstrates the powerful features
of the LTC2937 using six onboard LDO voltage regula-
tors, or by controlling an optional, externally-powered
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
performance summary
DC1361 board (an 8-channel power supply board). Multiple
DC2313A boards can also share timing and sequencing
signals to supervise more than six regulated supplies in
a coordinated manner.
The DC2313A connects to a PC through the DC1613 USB-
to-I
2
C/SMBus/PMBus Controller. This connection enables
the LTpowerPlay™ software, to have complete control over
the LTC2937 through the convenient LTpowerPlay GUI.
The GUI allows control over all of the LTC2937 registers,
and visibility into the status of the part in real time, and
it works with Linear Technology demo boards as well as
custom boards with an I
2
C interface.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2313A
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Voltage Range All 6 12 14 V
I
IN
Current to the Board Sequenced-Down 3.8 mA
I
IN
Current Sequenced-Up, No Loads 17.5 mA
V1-V6 Voltage Range Volts at the Turret 0 6 V
EN1-EN6 Voltage Range Volts at the Turret
†
0 6 V
Regulated LDO Voltage Tolerance Load Current < 20mA –1 1 %
Rated Output Current *V_OUT pins Load Current Per Channel 20 mA
Board Operating Temperature Powered 0 60 °C
Serial Clock Frequency I
2
C Bus Operating 10 400 kHz
†
NOTE: Analog switches U7, U8, and U9 (LTC222) are powered by 5V, and limit the maximum voltage range allowed at their S and D pins. The LTC2937
can tolerate up to 16.5V on its ENn pins.