Datasheet

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1 Introduction
This section contains background information for the TPS61175EVM-588 evaluation module.
1.1 Background
This TPS61175EVM-588 SEPIC is designed to boost and buck input voltages ranging from 9-V to 24-V to
a 12-V output. The goal of the EVM is to facilitate evaluation of the split-rail TPS61175 SEPIC power
supply solution. The EVM uses the TPS61175 adjustable output boost converter, external schottky diode,
input, output, and flying capacitors, a coupled inductor, split-rail circuitry, and the appropriate feedback
and compensation components to provide a regulated 12-V.
1.2 Performance Specification Summary
Table 1 provides a summary of the TPS61775EVM-588 performance specification. All specifications are
given for ambient temperature of 25°C.
Table 1. Performance Specification Summary for V
IN
= 9.0 V
PARAMETER CONDITIONS MIN NOM MAX UNIT
INPUT CHARACTERISTICS
V
IN
Input voltage 5 9 18 V
I
IN(AVG)
Average input current I
O
= 750 mA, V
IN
= 9V 1.3 A
f
SW
Switching frequency 750 kHz
OUTPUT CHARACTERISTICS
V
O
Output voltage 11
(1)
12 13
(1)
V
Line regulation 8.5 V < V
IN
< 9.5 V at I
O
= 400 mA 1% ΔV
O
/ΔV
IN
Load regulation V
IN
= 9 V, 50 mA < I
O
< 375 mA 1.5% ΔV
O
/ΔI
O
ΔV
O(PP)
Output voltage ripple I
O
= 750 mA, V
IN
= 9V 150 mV
PP
I
O
Output current V
IN
= 9V 1 750 mA
TRANSIENT RESPONSE
ΔI
O
Load step V
IN
= 9V 0.325 A
ΔV
O
V
O
undershoot V
IN
= 9V 0.4 V
(1)
Minimum and maximum values include 1% resistor tolerance as well as IC feedback reference voltage tolerance.
Table 2. Performance Specification Summary for V
IN
= 24.0 V with Split Rail Circuitry Installed
PARAMETER CONDITIONS MIN NOM MAX UNIT
INPUT CHARACTERISTICS
V
IN
Input voltage 9 18 24 V
I
IN(AVG)
Average input current
O
= 750 mA, V
IN
= 24V 0.5 A
f
SW
Switching frequency 750 kHz
OUTPUT CHARACTERISTICS
V
O
Output voltage 23
(1)
24 25
(1)
V
Line regulation 23 V < V
IN
< 24 V at I
O
= 750 mA 1% ΔV
O
/ΔV
IN
Load regulation V
IN
= 12 V, 50 mA < I
O
< 375 mA 1% ΔV
O
/ΔI
O
ΔV
O(PP)
Output voltage ripple I
O
= 750 mA, V
IN
= 24V 150 mV
PP
I
O
Output current V
IN
= 24V 1 0.750 A
TRANSIENT RESPONSE
ΔI
TRAN
Load step V
IN
= 24V 0.325 A
ΔV
TRAN
V
O
undershoot V
IN
= 24V 250 mV
(1)
Minimum and maximum values include 1% resistor tolerance as well as IC feedback reference voltage tolerance
2
TPS61175EVM-588 SLVU359–January 2010
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