Texas Instruments Evaluation Module for TPS54294 Synchronous Step-Down SWIFT Converter TPS54294EVM-057 TPS54294EVM-057 데이터 시트
제품 코드
TPS54294EVM-057
OUT1
OUT2
R1
R3
V
= 0.765 V
1+
; V
= 0.765 V
1+
R2
R4
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Modifications
3
Modifications
This evaluation module is designed to provide access to the features of the TPS54294. Some
modifications can be made to this module.
modifications can be made to this module.
3.1
Output Voltage Setpoint
To change the output voltages of the EVM, it is necessary to change the value of the top resistor of the
feedback divider, R1 or R3. Please refer to the top assembly in
feedback divider, R1 or R3. Please refer to the top assembly in
to locate the resistors close to
the output connectors. Changing the value of R1 or R3 can change the output voltage above 0.765 V. The
value of R1 or R3 for a specific output voltage can be calculated using
value of R1 or R3 for a specific output voltage can be calculated using
.
For output voltage from 0.76 V to 7 V:
(1)
lists the R1 or R3 values for some common output voltages. For output voltages of 1.8 V or
above, a feedforward capacitor (C21 or C20) may be required to improve the phase margin. Pads for this
component (C21 or C20) are provided on the printed-circuit board. Note that the resistor values given in
component (C21 or C20) are provided on the printed-circuit board. Note that the resistor values given in
are standard values and not the exact values calculated using
.
Table 3. Output Voltages
C14, C15, C18 Total Capacitance,
Output Voltage
R1, R3
R2, R4
C21, C20
L1, L2
C16, C17, C19 Total Capacitance
(V)
(k
Ω
)
(k
Ω
)
(pF)
(
µ
H)
(
µ
F)
1
6.81
22.1
1.0 - 1.5
22 - 68
1.05
8.25
22.1
1.0 - 1.5
22 - 68
1.2
12.7
22.1
1.0 - 1.5
22 - 68
1.5
21.5
22.1
1.5
22 - 68
1.8
30.1
22.1
5 - 22
1.5
22 - 68
2.5
49.9
22.1
5 - 22
2.2
22 - 68
3.3
73.2
22.1
5 - 22
2.2
22 - 68
5
124
22.1
5 - 22
3.3
22 - 68
3.2
Output Filter and Closed-Loop Response
The TPS54294 relies on the output filter characteristics to ensure stability of the control loop. The
recommended output filter components for common output voltages are given in
recommended output filter components for common output voltages are given in
. It may be
possible for other output filter component values to provide acceptable closed-loop characteristics. R11
and R12 are provided for convenience in breaking the control loop and measuring the closed-loop
response.
and R12 are provided for convenience in breaking the control loop and measuring the closed-loop
response.
4
TPS54294 Dual Channel SWIFT
™
Evaluation Module
SLVU491
–
November 2011
Copyright
©
2011, Texas Instruments Incorporated