
Technical Reference Manual
TMDXEVM6657L
SPRUHG7 - Revised August 2012
TMDXEVM6657LE
Page 57 / 90
The TMS320C6657 core power is supplied using a dual digital controller coupled to a high performance FET
driver IC. Additional DSP supply voltages are provided by discrete TI Swift power supplies. The TMS320C6657
supports a VID interface to enable Smart-Reflex® power supply control for its primary core logic supply. Refer to
the
and other documentation for an explanation of the Smart-Reflex® control.
The EVM power topology is a combination of switching supplies and linear supplies. The linear supplies are used
to save space for small loads. The switching supplies are implemented for larger loads. The switching supplies
are listed below followed by explanations of critical component selection:
•
CVDD (AVS core power for TMS320C6657)
•
VCC1V0 (1.0V fixed core power for TMS320C6657)
•
VCC3V3_AUX (3.3V power for peripherals)
•
VCC1V5 (1.5V DDR3 power for TMS320C6657 and DDR3 memories)
•
VCC5 (5.0V power for the XDS520V2 mezzanine card)
4.2.1 CVDD and VCC1V0 Design
The
CVDD
and
VCC1V0
power rails are regulated by TI Smart-Reflex controller UCD9222 and the dual
synchronous-buck power driver UCD7242 to supply DSP AVS core and CVDD1 core power.
UCD7242
C = 100uF x 2
47uF x 2
CVDD
L = 1.2uH
UCD9222
PWM1
PWM2
C = 47uF x 2
10uF x 1
VCC1V0
L = 2.3uH
VID pins
From DSP
Figure 4.3: CVDD and VCC1V0 Design on C6657 Lite EVM
CVDD Inductor Calculation
VCC1V0 Inductor Calculation
L = ((V
in(max)
- V
out
)/
∆I
out
) * V
out
/(V
in(max)
* F
sw
)
= ((12.5 - 1)/(2.7) * (1 / (12.5 * 750kHz))
= (11.5/2.7) * (1 / (9.375M))
= (4.26) * (0.107u)
≈ 0.46uH
L = ((V
in(max)
- V
out
)/
∆I
out
) * V
out
/(V
in(max)
* F
sw
)
= ((12.5 - 1)/(1.1) * (1 / (12.5 * 750kHz))
= (11.5/1.1) * (1 / (9.375M))
= (4.26) * (0.107u)
≈ 1.12uH
Reference Inductor = 1.2uH
Reference Inductor = 2.3uH
Содержание eInfochips TMDXEVM6657L
Страница 19: ...Technical Reference Manual TMDXEVM6657L SPRUHG7 Revised August 2012 TMDXEVM6657LE Page 19 90...
Страница 20: ...Technical Reference Manual TMDXEVM6657L SPRUHG7 Revised August 2012 TMDXEVM6657LE Page 20 90...
Страница 21: ...Technical Reference Manual TMDXEVM6657L SPRUHG7 Revised August 2012 TMDXEVM6657LE Page 21 90...
Страница 77: ...Technical Reference Manual TMDXEVM6657L SPRUHG7 Revised August 2012 TMDXEVM6657LE Page 77 90...