User guide

AC701 Evaluation Board www.xilinx.com 61
UG952 (v1.1) January 30, 2013
Feature Descriptions
Figure 1-40 shows the power system for UCD90120A U8 controller #1
X-Ref Target - Figure 1-40
Figure 1-40: U8 Controller #1 UCD90120A Power System
UG952_c1_137_011513
UCD90120A
Controller
(Controller 1)
U8
1. Capacitors labled C
f
are bulk filter capacitors.
2. Voltage Sense is connected at point of load.
GPIO (Out)
FPWM (Out)
ADC (In)
ADC (In)
GPIO (Out)
Input
Filter
LMZ12008
U49 (1.0V Nom)
Vin Vout
EN
FB
Rail Enable
PWM Margin
Current Sense
Voltage Sense
(2)
Low Pwr Select
Rs 5mΩ
+12V
V
fb
VCCINT 1.0V
C
f
C
f
(1)
G = 40.22
VCCINT 0A-10A
CS = 0V-2.01V
GPIO (Out)
FPWM (Out)
ADC (In)
ADC (In)
Input
Filter
TPS84621
U53 (1.8V Nom)
Vin Vout
EN
FB
Rail Enable
PWM Margin
Current Sense
Voltage Sense
(2)
Rs 5mΩ
+12V
V
fb
VCCAUX 1.8V
C
f
C
f
G = 67.67
VCCAUX 0A-6A
CS = 0V-2.03V
GPIO (Out)
FPWM (Out)
ADC (In)
ADC (In)
Input
Filter
TPS84320
U54 (1.0V Nom)
Vin Vout
EN
FB
Rail Enable
PWM Margin
Current Sense
Voltage Sense
(2)
Rs 5mΩ
+12V
V
fb
VCCBRAM 1.0V
C
f
C
f
G = 221.7
VCCVBRAM
0A-1.8A
CS = 0V-1.996V
GPIO (Out)
FPWM (Out)
ADC (In)
ADC (In)
Input
Filter
TPS84621
U55 (1.5V Nom)
Vin Vout
EN
FB
Rail Enable
PWM Margin
Current Sense
Voltage Sense
(2)
Rs 5mΩ
+12V
V
fb
FPGA_1V5 1.5V
C
f
C
f
G = 67.67
FPGA_1V5
0A- 6A
CS = 0V-2.03V
Notes: