Theory of Operation
: Controller
3-27
3.2.2.1.2 External Regulators: V_SW_1.4, V_SW_3.60
The controller board contains two TPS62050 regulators in order to regulate voltages of 1.4V and
3.6V. The TPS62050 is a synchronous step-down adjustable regulator. The switching regulator is
capable of sourcing 800mA. Its output can be adjusted by using a voltage divider tied to the feedback
pin. The regulators are powered from SW_B+.
Figure 3-16.
is the schematic for the V_SW_1.4
regulator.
Figure 3-16.
illustrates the supporting circuitry for the TPS62050.
Figure 3-16. V_SW_1.4 Switched Power Supply
V_1.55
10UF
4.7UF
C6586M6
C6584M6
330PF
C6570M6
R6568M6
V_SW_1.4
301K
C6582M6
L6505M6
6.8PF
10UH
SW1V4_FB
U6507M6
TPS62050
SW_B+
VCC_SW1.4_VIN
R6548M6
R6554M6
R6558M6
R6552M6
R6547M6
C6569M6
DNP
0
10UF
0
0
165K
100K
EN
PG
VIN
FB
GND
LBI
SYNC
PGND
SW
LBO
1
7
9
10
4
2
6
3
5
8
Summary of Contents for APX 2000
Page 1: ...APXTM TWO WAY RADIOS APX 1000 APX 2000 APX 4000 APX 4000Li DETAILED SERVICE MANUAL ...
Page 4: ......
Page 6: ...iv Document History Notes ...
Page 8: ...Notes vi Commercial Warranty ...
Page 10: ...Notes ...
Page 22: ...xiv List of Figures Notes ...
Page 226: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 688: ...Index 4 Index Notes ...
Page 690: ...ii Notes ...
Page 700: ...xvi List of Figures Notes ...
Page 806: ...5 50 Troubleshooting Charts PA Failure Notes ...
Page 1008: ...8 178 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 84012621001 Notes ...
Page 1062: ...8 234 Schematics Boards Overlays and Parts Lists Keypad Board M2 and M3 PC000261A01 Notes ...
Page 1064: ...ii Notes ...
Page 1068: ...Notes A 4 EMEA Warranty Service and Technical Support Further Assistance From Motorola ...
Page 1090: ...Glossary 10 Glossary Notes ...
Page 1094: ...Index 4 Index Notes ...
Page 1095: ......