Texas Instruments Evaluation Board for the LM3243 LM3243EVM/NOPB LM3243EVM/NOPB Datenbogen
Produktcode
LM3243EVM/NOPB
LM3243
PVIN VDD
SW
FB
VCON
PGND SGND
EN
MODE
VBATT
VOUT
ACB
BP
VCC_PA_2G
BB or
RFIC
DAC
GPO2
GPO1
BGND
1.5
µ
H
10
µ
F
1.0
µ
F
PA
4.7
µ
F
PA(s)
VCC_PA_3G
10
µ
F
Connections
6
Connections
Note that Headers H1 to H4 are 3-pin Header Connectors, with the center pin (Pin 2) connected to the
corresponding signal directly to the IC.
corresponding signal directly to the IC.
1. VBATT is connected to the red (+) and black (gnd) banana connector pins.
2. The load (resistor or PA) is connected to the yellow (+) and black (gnd) banana connector pins.
3. Header H1 - 2G/3G mode:
•
For 2G - the jumper is between center and right pins (PWM only).
•
For 3G - the jumper is between center and left pins (AUTO PFM/PWM).
4. Header H2- Switcher/Forced Bypass mode:
•
Jumper is always between center and right pin (normal switcher mode) for DC/DC switcher
operation.
operation.
5. Header H3 - Enable of the IC:
•
Disable - Jumper between center and right pin (OFF).
•
Enable - Jumper between center and left pin (ON).
6. Header H4 – VCON:
•
The VCON signal is connected to H4. The center pin is VCON and the pins on either side are
GND.
GND.
7
Turn-on Sequencing
1. VBATT is turned ON with VCON = LOW (< 0.5V) and EN = LOW (< 0.5V).
2. EN is set to HIGH (> 1.2V).
3. VCON is set to desired voltage level.
8
Typical Application Circuit
4
AN-2105 LM3243 DSBGA Evaluation Board
SNOI158AP – January 2011 – Revised MARCH 2013
Copyright © 2011–2013, Texas Instruments Incorporated