LM5145 datasheet(40/73 Pages) TI2

40 / 73 page

8.2.1.1 Design Requirements

Table 8-2 shows the intended input, output, and performance parameters for this circuit example.

Table 8-2. Design Parameters

DESIGN PARAMETER

VALUE

Input voltage range (steady state)

6.5V to 36V, nominal 13.5V

Minimum transient input voltage

4.5V

Maximum transient input voltage

36V

Output voltages

5V, 3.3V

Output currents (EDC) (1)

20A

Output currents (TDC) (1)

15A

Switching frequency

440kHz

Target efficiency at 5V, 15A

96%

Target efficiency at 3.3V, 15A

94.5%

Output voltage regulation

±1%

Loop crossover frequency

60kHz

Phase margin

> 45°

No-load sleep current, channel 2 disabled

< 20µA

Shutdown current

4µA

(1)

EDC and TDC refer to electrical and thermal design currents, respectively.

Resistor RRT sets the switching frequency at 440kHz. In terms of control loop performance, the target loop

crossover frequency is set in the range of 10% to 15% of switching frequency – 60kHz in this example – with a

target phase margin greater than 45°. Connecting a resistance of 20kΩ at RSS sets the output voltage soft-start

times to 4.6ms.

Table 8-3 cites the selected buck regulator powertrain components, with many of the components available from

multiple vendors. Power MOSFETs describes selection of power MOSFETs for lowest conduction and switching

power loss. This application circuit uses 40V logic-level power MOSFETs, metal-alloy buck inductors with low

DCR, low-ESL shunts, and ceramic input and output capacitors.

Table 8-3. List of Materials for Application Circuit 1

REFERENCE

DESIGNATOR

QTY

SPECIFICATION (1)

MANUFACTURER

PART NUMBER

CIN1, CIN2

10µF, 50V, X7R, 1210, ceramic

TDK

CNA6P1X7R1H106K

10µF, 50V, X7S, 1210, ceramic

Murata

GCM32EC71H106K

TDK

CGA6P3X7S1H106K

COUT1, COUT2

47µF, 10V, X7S, 1210, ceramic

TDK

CNA6P1X7S1A476M

Murata

GCM32EC71A476K

LO1, LO2

1µH, 2.3mΩ, 37A, 10.85 × 10 × 5.2mm

Cyntec

VCHA105D-1R0MS6

1µH, 2.3mΩ, 37A, 11 × 10 × 5.1mm

Bourns

SRP1050WA-1R0M

1µH, 2.1mΩ, 24A, 10.8 × 10 × 5mm

Eaton

HCM1A1105V2-1R0-R

1µH, 2.7mΩ, 33.8A, 10.85 × 10 × 3.8mm

Würth Electronik

784373680010

1µH, 2.4mΩ, 36.6A, 10.5 × 10 × 6.5mm

TDK

SPM10065VT-1R0M-D

Q1, Q3

40V, 3.6mΩ, 9nC, SON 5 × 6

Infineon

IAUCN04S7L028ATMA1

Q2, Q4

40V, 2.4mΩ, 15nC, SON 5 × 6

Infineon

IAUCN04S7L019ATMA1

RS1, RS2

Shunt, 2mΩ ±2%, ±100ppm/°C, 1225, 3W

Susumu

KRL6432E-M-R002-G

LM25137 42V dual-output synchronous buck controller

Texas Instruments

LM25137RHAR

(1)

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LM25137

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