TB-FMCH-HDMI4K Hardware User Manual
14
Rev.2.04
7. Supplying Power to the Board
Figure 7-1 shows the TB-FMCH-HDMI4K power supply structure. There is one LDO regulator to
generate 1.1 volts for the SN65DP159 and one switching regulator for 5.0 volts. Both use 3.3 volts from
the carrier card to generate the lower voltages. The carrier card 12 volts rail is not used. VADJ can be
from 1.2V to 3.3V and is used mainly for voltage translators and I2C repeaters. There is no onboard
power sequencing.
A green LED, located on the solder side, indicates the presence of the VCC_3V3 rail. Since this rail is
the main power source for the card it is protected with a 1.5 amp PTC resettable fuse (600mA is the
maximum expected current draw). If this fuse trips due to an overcurrent fault remove power to the card
and wait a few minutes for the PTC to cool. Remove the condition causing the excess current and apply
power. If the PTC trips again, remove power, wait for the fuse to cool, remove the card from the carrier,
and contact inrevium technical support.
Figure 7-1 TB-FMCH-HDMI4K Power Supply Structure
7.1. HDMI Five Volts Power
The HDMI source connector power is supplied from the TPS60151 boost switching regulator through a
Texas Instruments TPD5S116 HDMI companion device. This device provides transient and current
protection at the connector. The HDMI sink connector input five volts also goes to a TPD5S116 for
protection via a three-pin header (J9). J9 is used to internally supply five volts to the sink circuits if five
volts is not available at the sink connector, such as when the HDMI cable is disconnected. Figure 7-2
VCC_3V3
VCC_1V1
VCC_5V0
TPS74701
TPS60151
150mA max. to SN65DP159
140mA max.
HPC FMC Connector to Carrier Card
3V3_AUX
VADJ
1.2V to 3.3V for voltage
translators
For EEPROM and I2C
repeater
600mA max.
PTC Fuse
J3
U11
U33
1, 2
2
9, 10
3
D32
E39, F40,
G39, H40
C39, D36,
D38, D40
