Texas Instruments TPS43350EVM Evaluation Module TPS43350EVM TPS43350EVM Datenbogen
Produktcode
TPS43350EVM
Setup
Test Points
DLYAB
Power Good Delay for Buck Controller A and B
GND (x4)
Ground
PGA
Power Good for Buck Controller A
PGB
Power Good for Buck Controller B
PHA
Buck Controller A phase pin
PHB
Buck Controller B phase pin
SSA
Soft Start for Buck Controller A
SSB
Soft Start for Buck Controller B
VBAT
Power Input
VIN
Power Input after the reverse-polarity protection stage
VOUTA
Buck Controller A output
VOUTB
Buck Controller B output
2.2
Setup
The input voltage range for the device is from 4V-40V. At start-up, minimum input voltage is 6.5V. With the
settings of the EVM, for Buck B (set to 3.3V output) an input voltage of 4V is sufficient (after meeting the
start-up condition). Buck A, set to 5V output, naturally requires a higher supply voltage for proper
operation.
settings of the EVM, for Buck B (set to 3.3V output) an input voltage of 4V is sufficient (after meeting the
start-up condition). Buck A, set to 5V output, naturally requires a higher supply voltage for proper
operation.
2.3
Operation
For proper operation of the TPS4335x, ENA, ENB, EXTSUP, RT and SYNC jumpers should be properly
configured. The recommended setting, using the switch and shorting blocks.
configured. The recommended setting, using the switch and shorting blocks.
ENA
enabled
ENB
enabled
EXTSUP
A
RT
400KHz
SYNC
LPM
In this configuration, the regulators will turn on when power is applied. Delay sets the power-on reset
delay, slow, medium or fast. ENA and ENB turn the regulators on or off, disabled or enabled. EXTSUP
selects the power supply source for the gate drive. RT sets the switching frequency for the regulators to
approximately 240KHz, 400KHz or 600KHz. SYNC enabled LPM or forced continuous conduction mode
and is the external clock input for switching frequency synchronization of the buck converters. SYNC will
disable spread spectrum operation on the TPS43351-Q1 when set low or left open. The device can be
setup to run in low power mode, to reduce the quiescent operating current, by connecting the Sync test
point to ground. Low power mode will allow the device to switch into a PFM mode of operation if the load
current demand is low. It will automatically switch back to PWM mode as the load current increases.
delay, slow, medium or fast. ENA and ENB turn the regulators on or off, disabled or enabled. EXTSUP
selects the power supply source for the gate drive. RT sets the switching frequency for the regulators to
approximately 240KHz, 400KHz or 600KHz. SYNC enabled LPM or forced continuous conduction mode
and is the external clock input for switching frequency synchronization of the buck converters. SYNC will
disable spread spectrum operation on the TPS43351-Q1 when set low or left open. The device can be
setup to run in low power mode, to reduce the quiescent operating current, by connecting the Sync test
point to ground. Low power mode will allow the device to switch into a PFM mode of operation if the load
current demand is low. It will automatically switch back to PWM mode as the load current increases.
Table 2. Regulator Configuration
OUTPUT
MAXIMUM OUTPUT
REGULATOR
VOLTAGE
CURRENT
Buck Controller A
5.0 V
2A
Buck Controller B
3.3 V
4A
3
SLVU484
–
June 2011
TPS4335xEVM Evaluation Module
Copyright
©
2011, Texas Instruments Incorporated