Texas Instruments TPS65300-Q1, Руководство пользователя, Страница: 3 / 19

IGN
Low, part disabled
at startup , (unless
supplied via
IGN-terminal )
IGN
High, part enabled
at startup , do not
install if connected
at IGN-terminal
EN
Low, part disabled
after ignition of
(IGN = low)
EN
High, part remains
enabled after
ignition off
(IGN = low)
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Setup
Terminal blocks:
J1 – Input is the output terminal for the TPS65300 switch-mode converter. The terminal block provides a
power (VREG) and ground (GND) connection.
J2 – Output is the power input terminal for the device. The terminal block provides a power (VBAT) and
ground connection to allow the user to attach the EVM to a cable harness.
J3 – Sync is the input terminal to enable the TPS65300 at initial startup. The terminal block provides a
power (IGN) and ground (GND) connection. If this terminal is not used, install the IGN-Jumper to power-up
the device (see the respective description). If IGN is shut down again, the device will power down, unless
the EN-Jumper is installed.
J5 – Output is the output terminal for the TPS65300 linear regulator controller with 1.2V output. The
terminal block provides a power (1.2V) and ground (GND) connection. Please observe the Power-ratings
of the external bipolar-transistor: If powered from VREG, it allows approximately 120mA at room
temperature, approximately 50mA at 125°C ambient. Note, if the dropout is reduced by powering it from
the 3.3V-rail (installing BRIDGE jumper instead of 1.2V_PWR jumper), will allow higher currents on this
rail, but consider the extra power drawn from the 3.3V rail and its transistor
Jumpers:
IGN – required to power-up the device at startup: if IGN is low (IGN-terminal not supplied AND IGN-
jumper not installed) the part will not power-up (indifferent of EN-setting). Either supply IGN-terminal with a
High-level or install the IGN-jumper to power up the device:
Figure 2. IGN Jumper Settings
EN – Keeps the outputs of the devices active after ignition is turned off (IGN = low). However, a high level
on IGN is required for initial start-up. Before this, the EN-jumper has no effect. Note, as opposed to IGN,
the EN-pin is a logic-level-input, maximum input voltage should not exceed 5.25V.
Figure 3. EN Jumper Settings
3 SLVU685 – February 2012 TPS65300EVM
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