Board Layout
2.1.8
JP12, JP22, and JP32 – Mode
This jumper is used to select the operating mode of the converter. The converter operates in a fixed-
frequency, low-noise, PWM mode when a jumper is used to short the MODE pin to the ON pin. Shorting
the MODE pin and OFF pin together allows the controller to use the power-saving (PFM) mode for high
efficiency at low output currents.
2.2
Converter Configurations
All converters are designed to use an input voltage between 2.05 V and 6 V. But the input voltage must be
higher than the output voltage in order to maintain voltage regulation, and U31 requires 3.3-V minimum
input. Input voltage requirement may be as high as 1 V above output depending on output current; see the
data sheet for additional information. Connect the input voltage power supply and output according to
.
Table 2. Input and Output Connections
Converter No.
Output Voltage
Signal
Connection
U11
3 Vdc Fixed
Positive Input Voltage
J11
Input Voltage Return
J13
Positive Output Voltage
J14
Output Voltage Return
J16
U21
2.3 Vdc Fixed
Positive Input Voltage
J21
Input Voltage Return
J23
Positive Output Voltage
J24
Output Voltage Return
J26
U31
3.3 Vdc Fixed
Positive Input Voltage
J31
Input Voltage Return
J33
Positive Output Voltage
J34
Output Voltage Return
J36
2.3
Operation
The ENABLE jumper and the MODE jumper must be configured for proper operation of the converter.
For ENABLE, the converter enable uses a shorting block to set the JPX1 header to the desired
configurations. Each converter has its own header: JP11 for U11, JP21 for U21, and JP31 for U31. The
converters are shut down when the EN pin is pulled low; this is the ENABLE-to-OFF connection. The
converters are in operate mode when the EN pin is pulled high; this is the ENABLE-to-ON connection. Do
not leave the EN pin floating.
The MODE header, JPX2, controls the device power-save mode option. This mode changes the operation
at light loads; it has no impact at mid-to-high loads . The device can operate in the low-noise, fixed-
frequency PWM mode or high-efficiency, power-saving PFM mode at low power. Each converter has its
own mode header: JP12 for U11, JP22 for U21, and JP32 for U31. The converters are in PWM mode
when the MODE pin is pulled high; this is the MODE-to-ON connection. The converters operate in PFM
mode when the MODE pin is pulled low; this is the MODE-to-OFF connection. Do not leave the MODE pin
floating.
2.4
Test Results
See the Typical Characteristics section of the TPS6223x data sheet. This EVM uses the same inductors
and similar capacitors as those used for characterization in the data sheet. Performance is consistent with
that shown in the data sheet.
3
Board Layout
This section provides the TPS62233EVM-574 board layout and illustrations.
3
SLVU360B – April 2010 – Revised July 2013
TPS62233EVM-574 User's Guide
Copyright © 2010–2013, Texas Instruments Incorporated
