ZC706 Evaluation Board User Guide
74
UG954 (v1.5) September 10, 2015
Feature Descriptions
shows the power system for UCD90120A U48 controller.
X-Ref Target - Figure 1-33
Figure 1-33:
ZC706 TI UCD90120A Controller U48 Power System
Sense Connected
at Point of Load
GPIO (out)
FPWM (out)
ADC (in)
ADC (in)
GPIO (out)
Rail Enable
PWM Margin
Current Sense
Voltage Sense
Low Pwr Select
Vin
EN
FB
Vout
12V
Input
Filter
Bulk Filter Caps
Low Power || Radj
Low = 1.0V (Default)
High = 0.9V
V
fb
Input
Filter
Bulk Filter Caps
V
fb
Vin
EN
FB
Vout
Vin
EN
FB
Vout
Vin
EN
FB
Vout
Vin
EN
FB
Vout
LMZ31520
U42
LMZ31710
U98
Rail Enable
PWM Margin
Current Sense
Voltage Sense
Rail Enable
PWM Margin
Current Sense
Voltage Sense
Rail Enable
PWM Margin
Current Sense
Voltage Sense
Rail Enable
PWM Margin
Current Sense
Voltage Sense
I0B
I1B
I2B
I3B
S[1:0]
YB
FMC_ADJ_SEL[1:0]
GPIO (out)
FPWM (out)
ADC (in)
ADC (in)
GPIO (out)
FPWM (out)
ADC (in)
ADC (in)
GPIO (out)
FPWM (out)
ADC (in)
ADC (in)
GPIO (out)
GPIO (out)
FPWM (out)
ADC (in)
ADC (in)
FMC_ADJ_SEL[1:0]
VCCINT 1.0V
UCD90120A Controller U48
VCCINT 1.0V Nom.
VCCAUX 1.8V Nom.
Input
Filter
Bulk Filter Caps
V
fb
LMZ31506
U85
VCC1V5_PL 1.5V Nom.
Input
Filter
Bulk Filter Caps
V
fb
LMZ31506
U86
VADJ_FPGA 2.5V Nom.
Input
Filter
Bulk Filter Caps
V
fb
LMZ31710
U15
VCC3V3 FPGA 3.3V Nom.
U66
Dual 4-to-1 Mux
Sense Connected
at Point of Load
VCCAUX 1.8V
VCC1V8 1.8V
Sense Connected
at Point of Load
VADJ_FPGA 2.5V
VADDJ 2.5V
Sense Connected
at Point of Load
VCC3V3 FPGA 3.3V
VCC3V3 3.3V
Sense Connected
at Point of Load
VCC1V5_PL 1.5V
[ 1 0 ]
0
0
1
1
0
1
0
1
UG954_c1_33_041615
Notes:
1. Capacitors labeled Cf are bulk filter capacitors.
2. Voltage Sense is connected a point of load.