PD24012H [MICROSEMI]
Interface Circuit;TM
TM
Introduction: DAZL!TM LED Drivers
Value Proposition
Advanced Power Management - To minimize overall
system power dissipation, DAZL! adaptively control RGB
power supplies output voltage levels based on advance
power management algorithm.
Microsemi's DAZL! Family of mixed signal high voltage LED
driver ICs is designed for LCD panel backlights using strings
of either red, green, and blue (RGB) or white LEDs.
Fault Detection - DAZL! ICs constantly monitor the cur-
rent and voltage of all LED strings at a high sample rate.
This data is saved and sent to a companion PD23000
32-bit system controller.
The high sample rate enables the system controller to
respond quickly to detected faults due to LED opens
and/or shorts.
Advanced Control of Color & Brightness Uniformity -
DAZL! ICs feature individually controlled internal PWMs
for each of their 12 ports. Frequencies range from 150Hz
to 16KHz. Individual PWMs allow for independent control
of the current in each string, adjusting automatically for
current mismatches between strings to enable more accu-
rate color and brightness uniformity.
DAZLTM LED drivers are ideal for LCD TVs and other
large LCD-based displays.
Advanced Backlight features - The advanced features
of the DAZL! Family enables it to support zone dimming
(D2) and scanning backlights (D1). Multiple bus interfaces
in the form of two SPI buses that can work in parallel offer
higher bandwidth--and the ability to control up to 30
PD24012 ICs and 360 LED strings with a single PD23000
32-bit system controller.
The DAZL! Family integrates all necessary power,
analog and logic functions while supporting multiple LED
strings in a compact monolithic package.The ICs drives LED
strings, while simultaneously monitoring and measuring
backlight string voltage and current to control power supply
voltage for optimum performance.
Risk & Cost Reduction - The DAZL! Family is designed
to provide significant cost reductions for LED backlight
manufacturers. The independent PWMs on each of the 12
ports allow LED strings of any color to be connected to
any port. This flexibility provides a universal solution to
accommodate a variety of LED string combinations, such
as 4R-4G-4B or 3R-6G-3B LEDs. Identical packages and
pin outs between the PD24012H and PD24012L drivers
allow for similar architecture, design and layout considera-
tions for both low-power and high-power LEDs, reducing
development time and risk for a faster time-to-market.
The DAZL! Family consists of two ICs, designed for back-
light units having either high-power or low-power LEDs:
For high-power LEDs, the PD24012H is capable of driving
external MOSFETs for a string current of up to 1.5A on each
of 12 ports.
For low-power LEDs, the PD24012L features on-chip
MOSFETs capable of driving a string current of up to 60mA
on each of its 12 ports. With 65V output voltage supporting
each LED string, the PD24012L can accommodate at least
15 low power LEDs per string without external MOSFETs.
(~ Vf = 3.5V)
Both DAZL! driver ICs feature 12 independent ports capable
of driving 12 LED strings. Each string is controlled by inde-
pendent PWM circuitry that adjusts string current for the
desired color and intensity.
Pin Configuration
Current, output port voltage and temperature are monitored
separately for sophisticated control of each LED string. A
temperature sensor at each port automatically shuts down
the port in the event of excessive thermal stress.
All PD24012 driver ICs are designed to support a full set of
advanced features including scanning backlight (D1) and
zone dimming (D2). They also support two external SPI
buses that can work independently, or in parallel.
A single SPI bus provides full functionality. When in parallel,
one SPI bus is used for initialization and monitoring of val-
ues, while the second interfaces directly to a video con-
troller, enabling direct control of enable/disable ports and
PWM values.
DAZL! Features
Evaluation Environment
LED Driver:
• 12 ports to drive 12 LED strings
Performance of PD24012 ICs can be fully evaluated using
the Microsemi PD25000EV Evaluation Board.
• Low power LEDs (up to 60mA) driven
by internal MosFETs
• High Power LEDs (up to 1.5A)
driven by external MosFETs
• Up to 2.1W chip power dissipation
Communication Interface:
• 2x SPI buses for:
- Enhanced SPI for system control
- SPI to system host - such as video
controller
- Direct interface to color manager
Protection:
• Short Circuit Protection
• Open Circuit indication
• Over Temperature Protection
PWM:
• 12 PWMs (each port has its own PWM)
• Frequency 150Hz-16KHz
Power Supply:
• Operating Supply Voltage: 5V
• Output Voltage: 65V
• I/O Voltage: 3.3V or 5V
Working Modes
• Normal Mode for standard operation
• Sleep Mode for power saving
Operating Temperature: -20°C to +85°C
Package: LQFP
RoHS Compliant
PD24012H
PD24012L
LED Driver supporting
High Power LEDs using
External MOSFET
LED Driver supporting
Low Power LEDs using
internal MOSFET
Ordering Information
Part Number
Description
PD24012L
12 port LED driver with internal MosFETs
for Low Power LEDs
PD24012H
12 port LED driver for High Power LEDs
Analog Mixed Signal Group
11861 Western Avenue
Garden Grove, CA 92841
USA
Phone: (714) 372-8080
www.microsemi.com
Copyright ® Microsemi Corporation, 2007
Microsemi is a trademark of Microsemi Corporation. All other trademarks are property of their respective owners. Information in this document is
subject to change without notice. This document contains information that is proprietary to Microsemi. As such, it is confidential and its disclosure is
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