Freescale Semiconductor MPC5748G EVB, User Manual

Page: 37 / 88

5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
Rfb1
Rfb2
Main EVB
Power In
Vout = 1.25(1 + (R2/R1))
= 5.0V
(0603
50V)
GND Test Points, Top Side
Rfb1
Rfb2
Vout = 1.25(1 + (R2/R1))
= 3.295V
3.3V Linear Regulator (800mA Max **)
(35V TANT) (35V
TANT)
(0402 50V)
Could also use 2x82 Ohm resistors for RFB2 but not in agile...
1% resitors 1% resitors
Rfb1
Rfb2
Vout = 1.25(1 + (R2/R1))
= 1.25V
1% resitors
1.25V Linear Regulator (800mA Max **)
(35V TANT)
(35V
TANT)
Power Input and Linear Voltage Regulators
Input 12V DC nominal (range 10v - 14v)
See note on schematic sheet 3 regarding 3.3V regulator when running at < 11V)
1.25V for External core supply. Simpler to use linear rather than switcher so can safely
power from 5V switcher (slight ripple not an issue) for reduced heat dissipation
(c200 rad
pol 50V)
2.1mm Barrel
Connector
(2 Screw
Connector)
(Power Switch)
Power Supply Input and Filter Test and reference points
GND Test Points for underside of board
5.0V Linear Regulator (800mA Max **)
(35V TANT) (35V
TANT)
(CC7343-43
25V)
(10v-14v)
(3A)
(3A)
1K Load
resistor to
ensure proper
regulation if
1.25V MCU
jumper removed
The LM1117 linear regulators provide a maximum output
current of 800mA in ideal conditions. The current
requirement for each regulator is in the region of 10's
of mA (significantly under the maximum rating) so
these regulators will run cool on the EVB.
** Notes on Linear Regulator LM1117
VFused 12V-IN VSwitched
3V3_LR P12V
GND
1V25_LR
GND
P12V
5V0_SR
GND
P12V
GND
GND
GND
5V0_LR P12V
GND
GND
P12V
Drawing Title:
Size Document Number Rev
Date: Sheet of
Page Title:
Automotive Microcontroller
Applications
East Kilbride, Scotland
SCH-27897 PDF: SPF-27897 D1
MPC574xx Customer EVB Main Board
B
Friday, August 14, 2015
Power Input and Linear Voltage Regulators
2 16
Freescale General Business Use
Drawing Title:
Size Document Number Rev
Date: Sheet of
Page Title:
Automotive Microcontroller
Applications
East Kilbride, Scotland
SCH-27897 PDF: SPF-27897 D1
MPC574xx Customer EVB Main Board
B
Friday, August 14, 2015
Power Input and Linear Voltage Regulators
2 16
Freescale General Business Use
Drawing Title:
Size Document Number Rev
Date: Sheet of
Page Title:
Automotive Microcontroller
Applications
East Kilbride, Scotland
SCH-27897 PDF: SPF-27897 D1
MPC574xx Customer EVB Main Board
B
Friday, August 14, 2015
Power Input and Linear Voltage Regulators
2 16
Freescale General Business Use
DS6
LED GREEN
A C
R305
1K
GND13
1
GND4
1
C268
0.1UF
TP17
1
L5
27uH
1 2
F1
Fuse Holder
1 2
GND10
1
R77 0
R72
100
DNP
GND17
1
GND7
1
GND1
1
+
C27
10UF R73
100
U16
LM1117MPX-ADJ
ADJ
1
VOUT
2
IN
3
TAB_VOUT
4
R273
270
GND5
1
P23
A
1
B
2
+
C26
10UF
U15
LM1117MPX-ADJ
ADJ
1
VOUT
2
IN
3
TAB_VOUT
4
GND8
1
+
C30
10UF
DS5
LED GREEN
A C
R76 0
GND12
1
+ C32
1000UF
GND2
1
DS4
LED GREEN
A C
GND15
1
+
C29
10UF
C269
1000pF
R74
100
P21
1
3
2
R271 5.6
GND3
1
R284
0
+
C33
68UF
R75 0
DNP
SW5
1 3
4 2
5
R272
0
R70 300
GND11
1
+
C28
10UF
GND9
1
TP16
1
GND14
1
TP15
1
D202
B340A
A
C
R274
560
U14
LM1117MPX-ADJ
ADJ
1
VOUT
2
IN
3
TAB_VOUT
4
GND6
1
J23
1
2
3
GND16
1
R285
0
GND18
1
Q1
BSH103
1
2 3
R71 158
+
C31
10UF
R283 1.8K