Datasheet

3.1 Sequencing Jumper (JP3)
3.2 Enable Jumpers (JP1 and JP2)
3.3 Error Amplifier Outputs
3.4 Test Point Descriptions
www.ti.com Schematic
The TPS55386EVM-363 provides a 3 pin 100-mil header and shunt for programming the TPS55386’s
sequencing function. Placing the JP3 shunt in the Left Position connects the sequence pin to BP and sets
the TPS55386 controller to sequence Channel 2 prior to Channel 1 when Enable 2 is activated. Placing
the JP3 shunt in the Right Position connects the sequence pin to GND and sets the TPS55386 converter
to sequence Channel 1 prior to Channel 1 when Enable 1 is activated. Removing the JP3 shunt disables
sequencing and allows Channel 1 and Channel 2 to be enabled independently.
TPS55386EVM-363 provides separate 3 pin 100-mil headers and shunts for exercising the TPS55386
Enable functions. When JP3 is removed placing the JP1 shunt in the Left Position connects EN1 to
ground and turns on Output 1 and placing the JP2 shunt in the Left Position connects EN2 to ground and
turns on Output 2.
When the JP3 shunt is in the LEFT position, placing the JP2 shunt in the LEFT position connects EN2 to
ground and turns on first Output 2 and then Output 1.
When the JP3 shunt is in the RIGHT position, placing the JP1 shunt in the LEFT position connects EN1 to
ground and turns on first Output 1 and then Output 2.
The output of the TPS55386 transconductance error amplifiers (COMP1 and COMP2) are sensitive to
capacitive loading, including the typical 8-15pF capacitance added by an oscilloscope probe. No direct
measurements of these signals should be attempted without using an external buffer to prevent loading of
the control voltage.
Table 2. Test Point Descriptions
Test Point Lable Use Section
TP1 VIN Monitor Input Voltage 3.3.1
TP2 GND Ground for Input Voltage 3.3.1
TP3 VOUT1 Monitor VOUT1 Voltage 3.3.2
TP4 GND Ground for VOUT1 Voltage 3.3.2
TP5 GND Ground for VOUT1 Channel B Loop Monitoring 3.3.3
TP6 CHB VOUT1 Channel B for Loop Monitoring 3.3.3
TP7 GND Ground for VOUT1 Channel A Loop Monitoring 3.3.3
TP8 CHA VOUT1 Channel B for Loop Monitoring 3.3.3
TP9 SW1 Monitor Switching Node of Channel 1 3.3.4
TP10 GND Ground for Switch Node of Channel 1 3.3.4
TP11 IC_GND Monitor IC Ground 3.3.5
TP12 SW2 Monitor Switching Node of Channel 2 3.3.6
TP13 GND Ground for Switch Node of Channel 2 3.3.6
TP14 CHA VOUT2 Channel A for Loop Monitoring 3.3.7
TP15 GND Ground for VOUT2 Channel A Loop Monitoring 3.3.7
TP16 CHB VOUT2 Channel B for Loop Monitoring 3.3.7
TP17 GND Ground for VOUT2 Channel B Loop Monitoring 3.3.7
TP18 VOUT2 Monitor VOUT2 Voltage 3.3.8
TP19 GND Ground for VOUT2 Voltage 3.3.8
SLVU273 – September 2008 Using the TPS55386EVM-363 A 12V Input, 5.0V & 3.3V Output, 3A Non-Synchronous Buck Converter 5
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