LM5010 EVAL National Semiconductor, LM5010 EVAL Datasheet

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LM5010 EVAL

Manufacturer Part Number
LM5010 EVAL
Description
BOARD EVALUATION LM5010
Manufacturer
National Semiconductor
Datasheets

Specifications of LM5010 EVAL

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
10V
Current - Output
1A
Voltage - Input
12 ~ 75V
Regulator Topology
Buck
Frequency - Switching
480kHz
Board Type
Fully Populated
Utilized Ic / Part
LM5010
Lead Free Status / RoHS Status
Not applicable / Not applicable
Power - Output
-
© 2004 National Semiconductor Corporation
LM5010 Evaluation Board
Introduction
The LM5010EVAL evaluation board provides the design en-
gineer with a fully functional buck regulator, employing the
constant on-time (COT) operating principle. This evaluation
board provides a 10V output from an input range of 12V -
75V. The circuit provides load currents
limit set at )1.3A.
The board’s specification are:
Theory of Operation
Refer to the board’s schematic in Figure 4, which contains a
simplified block diagram of the LM5010. When the circuit is
in regulation, the buck switch is on each cycle for a time
determined by R1 and V
The on-time in this evaluation board will range from )1750
ns at V
on-time, the feedback voltage at FB is above 2.5V, and the
Minimum Off-Timer ensures the buck switch is off for at least
265 ns. In normal operation, the off-time is longer. During the
off-time, the output capacitor (C7) discharges, and when the
output voltage falls so that the voltage at FB is below 2.5V,
IN
= 12V, to )310 ns at V
IN
according to the equation:
IN
= 75V. At the end of the
>
AN201326
1A, with the current
FIGURE 1. Evaluation Board - Top Side
National Semiconductor
Application Note 1352
Dennis Morgan
December 2004
• Input Voltage: 12V to 75V
• Maximum Continuous Output current: 1.0A
• Current Limit: 1.3A
• Measured Efficiency: 93% (V
• Switching Frequency: )480 kHz
• Size: 1.1 in. x 1.875 in. x 0.47 in
the comparator output switches to initiate a new on-time. As
required by the datasheet, this circuit provides a minimum of
25mVp-p ripple at the FB pin. Refer to the LM5010 data
sheet for a more detailed block diagram, and a complete
description of the various functional blocks.
Board Layout and Probing
The pictorial in Figure 1 shows the placement of the circuit
components. The following should be kept in mind when the
board is powered:
1) When operating at high input voltage and/or high load
current, forced air flow IS NECESSARY.
2) The LM5010, and the diode D1 will be hot to the touch
when operating at high input voltage and/or high load cur-
rent.
Output Voltage: 10V,
±
3%
IN
= 12V, I
OUT
www.national.com
20132601
= 500 mA)

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LM5010 EVAL Summary of contents

Page 1

... LM5010 Evaluation Board Introduction The LM5010EVAL evaluation board provides the design en- gineer with a fully functional buck regulator, employing the constant on-time (COT) operating principle. This evaluation board provides a 10V output from an input range of 12V - 75V. The circuit provides load currents limit set at )1.3A. ...

Page 2

Board Layout and Probing 3) Use CAUTION when probing the circuit at high input voltages. 75 volts is enough to produce shocks and sparks maximum load current (1A), the wire size and length used to connect the load ...

Page 3

... TDK C2012X7R2A104M TDK C2012X7R1C104M TDK C2012X7R1C223M TDK C4532X7R1E226M Central Semi CUD6-02C TDK SLF12575T-470M2R7 12 12.5 mm CRCW08051503F CRCW08053001F CRCW08051001F CRCW08051R50F See data sheet National Semiconductor TSSOP - 14EP LM5010MH 3 20132602 Package Value 1812 2.2 µF, 100V 0805 0.1 µF, 100V 0805 0.1 µF, 16V 0805 0.022 µ ...

Page 4

PCB Layout www.national.com 4 20132605 20132606 ...

Page 5

... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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