Texas Instruments Evaluation Module for TPS62170 TPS62170EVM-627 TPS62170EVM-627 Datenbogen
Produktcode
TPS62170EVM-627
Introduction
1
Introduction
The TPS62160 is a 1-A, synchronous, step-down converter in a 2x2-mm, 8-pin WSON package. Both
fixed and adjustable output voltage units are available.
fixed and adjustable output voltage units are available.
The TPS62170 is a 0.5-A, synchronous, step-down converter in a 2x2-mm, 8-pin WSON package. Both
fixed and adjustable output voltage units are available.
fixed and adjustable output voltage units are available.
1.1
Background
The TPS62160EVM-627 (HPA627-001) uses the TPS62160 adjustable version and is set to a 3.3-V
output. The EVM operates with full-rated performance with an input voltage between 3.7 V and 17 V.
output. The EVM operates with full-rated performance with an input voltage between 3.7 V and 17 V.
The TPS62170EVM-627 (HPA627-002) uses the TPS62170 adjustable version and is set to a 3.3-V
output. The EVM operates with full-rated performance with an input voltage between 3.7 V and 17 V.
output. The EVM operates with full-rated performance with an input voltage between 3.7 V and 17 V.
1.2
Performance Specification
provides a summary of the TPS621x0EVM-627 performance specifications. All specifications are
given for an ambient temperature of 25
°
C.
Table 1. Performance Specification Summary
Specification
Test Conditions
Min
Typ
Max
Unit
Input Voltage
3.7
17
V
Output Voltage
PWM Mode of Operation
3.227
3.327
3.427
V
Output Current
TPS62160EVM-627
0
1000
mA
TPS62170EVM-627
0
500
mA
Peak Efficiency
93.1
%
Soft-Start Time
180
µ
s
1.3
Modifications
The printed-circuit board (PCB) for this EVM is designed to accommodate both the fixed and adjustable
voltage versions of this integrated circuit (IC). Additional input and output capacitors can also be added.
Finally, the loop response of the IC can be measured.
voltage versions of this integrated circuit (IC). Additional input and output capacitors can also be added.
Finally, the loop response of the IC can be measured.
1.3.1
Fixed Output Operation
U1 can be replaced with the fixed-voltage version of the IC for evaluation. For fixed-voltage version
operation, replace R2 with a 0-
operation, replace R2 with a 0-
Ω
resistor and remove R1.
1.3.2
Input and Output Capacitors
C4 is provided for an additional input capacitor. This capacitor is not required for proper operation but can
be used to reduce the input voltage ripple.
be used to reduce the input voltage ripple.
C3 is provided for an additional output capacitor. This capacitor is not required for proper operation but
can be used to reduce the output voltage ripple and to improve the load transient response. The total
output capacitance must remain within the recommended range in the data sheet for proper operation.
can be used to reduce the output voltage ripple and to improve the load transient response. The total
output capacitance must remain within the recommended range in the data sheet for proper operation.
1.3.3
Loop Response Measurement
The loop response of the TPS621x0EVM-627 can be measured with two simple changes to the circuitry.
First, install a 10-
First, install a 10-
Ω
resistor across the pads in the middle of the back of the PCB. The pads are spaced to
allow installation of 0805- or 0603-sized resistors. Second, cut the short section of trace between the via
on the output voltage and the trace that connects to the VOS pin via. These changes are shown in
on the output voltage and the trace that connects to the VOS pin via. These changes are shown in
. With these changes, an ac signal (10-mV, peak-to-peak amplitude recommended) can be
injected into the control loop across the added resistor.
2
TPS62160EVM-627 and TPS62170EVM-627
—
Evaluation Modules
SLVU483
–
October 2011
Copyright
©
2011, Texas Instruments Incorporated