UG-304
EVAL-ADM1075EBZ User Guide
10070-
102
Figure 2. Board Lab Setup
Table 1. Emitter Follower Configuration
Component
Value
Effect
R57
0 Ω
System power to Emitter Follower 1
R25
Not populated
Isolates Emitter Follower 1 from Emitter Follower 2
R59
Not populated
Power 5 V LED off other emitter follower (Emitter Follower 2)
R43
0 Ω
Powers 5 V LED off Emitter Follower 2
R58
0 Ω
Powers VIN directly via emitter follower 1
D5
11 V Zener
Powers VIN directly with ~10.5 V
The
ADM1075
can be powered via a shunt resistor from the hot-
swap line voltage or can be powered directly from a 9.2 V to 11.5 V
supply. The shunt power option is the default on the evaluation
board; however, an emitter follower can be reconfigured to generate
the chip voltage directly. The required board modifications are
shown in Table 1. More information on powering the
ADM1075
can be found in the
ADM1075
data sheet. The default power
configuration is shown in Figure 3, and the emitter follower
configuration is shown in Figure 4.
LOAD
ADM1075
EMITTER
FOLLOWER
1
TERMINAL
BLOCK
TERMINAL
BLOCK
ISOLATED AREA
LEDs
DEFAULT POWER PATH
OPTIONAL POWER PATH
EMITTER
FOLLOWER
2
ISOLATED 5V
5V
5V
5V
5V
RTN
–48V
12V
SHUNT
i
Couplers
iso
Power
®
USB
MINI
TEMP
SENSORS
EEPROM
10070-
103
Figure 3. Board Power (Shunt)
LOAD
ADM1075
EMITTER
FOLLOWER
1
TERMINAL
BLOCK
TERMINAL
BLOCK
ISOLATED AREA
LEDs
DEFAULT POWER PATH
OPTIONAL POWER PATH
CONFIGURABLE POWER PATH
EMITTER
FOLLOWER
2
ISOLATED 5V
5V
10.5V
5V
5V
5V
RTN
–48V
USB
MINI
TEMP
SENSORS
EEPROM
10070-
104
i
Couplers
iso
Power
®
Figure 4. Board Power (Emitter Follower)
Rev. C | Page 4 of 19
