LP5524TM-5EV National Semiconductor, LP5524TM-5EV Datasheet

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LP5524TM-5EV

Manufacturer Part Number
LP5524TM-5EV
Description
BOARD EVALUATION FOR LP5524
Manufacturer
National Semiconductor
Datasheets

Specifications of LP5524TM-5EV

Current - Output / Channel
100mA
Outputs And Type
4, Non-Isolated
Features
Programmable output current
Voltage - Input
2.7 ~ 5.5V
Utilized Ic / Part
LP5524
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Voltage - Output
-
Lead Free Status / Rohs Status
Not Compliant
© 2008 National Semiconductor Corporation
LP5524 Evaluation Kit
LP5524 Overview
The LP5524 is a highly integrated dual-zone LED driver that
can drive up to four LEDs in parallel with a total output current
of 100 mA. Regulated high side internal current sources de-
liver excellent current and brightness matching in all LEDs.
Extremely low minimum headroom voltage allows the use of
operating voltages that are colse to LED forvard voltages.
LED driver current sources are split into two independently
controlled banks for driving secondary displays, keypads and
indicator LEDs. Brightness control is achieved by applying
PWM signals to each enable pin. Default LED current is 5mA
and an optional external resistor can be used to set initial
brightness to user required values. LP5524 is available in
National’s tiny 9-bump Micro SMD package.
300353
Figure 1. LP5524 Evaluation Board
National Semiconductor
AN-1702
Anssi Raisanen
March 17, 2008
Evaluation Kit Overview
LP5524 Evaluation Kit enables designers an easy way to
evaluate the performance of the device. The evaluation board
has jumpers for each enable pin for easy on / off type control.
These inputs can also be fed with external PWM source.
Jumpers on LED outputs allow easy LED current measuring.
ISET pin has a jumper for selecting between two LED current
levels.
The kit supports complete functional evaluation of the circuit.
The evaluation kit consists of:
LP5524 evaluation board
LP5524 datasheet
Evaluation kit document (this doc.)
www.national.com
30035315

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LP5524TM-5EV Summary of contents

Page 1

... PWM signals to each enable pin. Default LED current is 5mA and an optional external resistor can be used to set initial brightness to user required values. LP5524 is available in National’s tiny 9-bump Micro SMD package. © 2008 National Semiconductor Corporation National Semiconductor AN-1702 Anssi Raisanen March 17, 2008 ...

Page 2

Jumper Description This describes the jumpers and the connectors on the LP5524 Evaluation Board. VIN – J1 This connector is the positive input for power supply. Evalu- ation board can operate with supply voltages from 2.7V to 5.5V. The input ...

Page 3

Getting Started The following instructions show how to set up and use the LP5524 evaluation kit. Please use ESD protection to prevent any unwanted damaging ESD events. 1. Check the onboard jumpers. Jumpers on the LED outputs (J3, J5-J7) and ...

Page 4

Board Layout A four layer board was used to enable the use of micro-VIAs. Micro VIA is required for routing the center pad of the LP5524. The evaluation board layers are: 1. Top, component side, signal 2. Layer 2, Vin ...

Page 5

Figure 6. LP5524 Evaluation Board Layer 3. Schematic List of Components Reference Model C1 100 nF 10V 33kΩ -D4 LS T676 U1 LP5524 30035303 Figure 7. LP5524 Evaluation Board Layer 4 (Bottom). Figure 8. LP5524 Evaluation Board ...

Page 6

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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