herunterladen
This is information on a product in full production.
June 2015 DocID025319 Rev 3 1/69
L99LD01
High efficiency constant current LED driver for automotive
applications
Datasheet
-
production data
Features
• Automotive qualified
• Constant current operation
• Current LED settable by external sensing
resistor and adjustable via SPI
• Converter switching frequency adjustable by
external resistor (R
SF
)
• EMC reduction by internal spread spectrum
dither oscillator
• Low frequency PWM dimming operation.
• Maximum input current limiter
• Maximum switching duty cycle limiter
• Slope compensation adjustable by external
resistor (R9)
• Battery overvoltage shut down protection (ext.
R3, R4 resistors required)
• Led chain OV detection (ext. R5, R6)
• Multiplexed output for monitoring and control of
LED temperature (external NTC resistor
required), voltage of LED chain, and low
frequency PWM
• SPI communication serial interface transceiver
(SDI, SDO, SCK, CSN)
• Regulated output for micro supply 5 V ± 2 %
-20 mA
• Parameter programming and settings of
internal memory registers by the dedicated SPI
interface:
– LED current reference adjusting (± 66.7 %)
– Maximum input current limiter reference
adjusting (± 55.5 %)
– Random dither frequency sweeping,
modulation frequency and deviation
percentage
• Power on reset pin output
• ESD protection
Applications
Automotive day time running light, LED
HeadLamps
Description
L99LD01 is a precise constant current DC–DC
converter LED driver for automotive applications,
dedicated to the control of high-brightness LED
headlights and housed in a LQFP32™ package.
The device is designed to be used in Boost, Buck-
Boost and Fly back converter topologies. An
internal random dither oscillator works in low
frequency modulation, allowing the RF spectrum
of the switching frequency to spread so to reduce
EMC emissions. The slope compensation
ensures good converter loop stability whatever is
the duty cycle needed by the application.
The converter is able to work either in full power
mode or in low frequency dimming mode.
The device includes an internal low drop voltage
regulator, that can be used to supply a
microcontroller, and a reset pin, that is useful for
resetting the microcontroller at the start up and
every time that the regulated output voltage falls
down below an established voltage threshold.
Max V
BATT
40 V
Operation supply battery voltage
V
BATT
5.6 - 24 V
Oscillator frequency range 100 - 500 kHz
LQFP32
7x7 mm
GAPG1506151117CFT
www.st.com
Verzeichnis
- ・ Konfiguration des Pinbelegungsdiagramms on Seite 7
- ・ Abmessungen des Paketumrisses on Seite 65 Seite 66
- ・ Blockdiagramm on Seite 6 Seite 7
- ・ Typisches Anwendungsschaltbild on Seite 17 Seite 59 Seite 60 Seite 61 Seite 62
- ・ Beschreibung der Funktionen on Seite 8 Seite 9 Seite 10 Seite 11 Seite 12
- ・ Technische Daten on Seite 44 Seite 45
- ・ Anwendungsbereich on Seite 1
- ・ Elektrische Spezifikation on Seite 17 Seite 44 Seite 45 Seite 46 Seite 47
