LED driver. L99LD01 Datasheet

L99LD01 driver. Datasheet pdf. Equivalent


STMicroelectronics L99LD01
L99LD01
High efficiency constant current LED driver for automotive
applications
Datasheet - production data
Features
LQFP32
7x7 mm
GAPG1506151117CFT
Max VBATT
Operation supply battery voltage
VBATT
Oscillator frequency range
40 V
5.6 - 24 V
100 - 500 kHz
Automotive qualified
Constant current operation
Current LED settable by external sensing
resistor and adjustable via SPI
Converter switching frequency adjustable by
external resistor (RSF)
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.
June 2015
This is information on a product in full production.
DocID025319 Rev 3
1/69
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L99LD01 Datasheet
Recommendation L99LD01 Datasheet
Part L99LD01
Description High efficiency constant current LED driver
Feature L99LD01; L99LD01 High efficiency constant current LED driver for automotive applications Datasheet - product.
Manufacture STMicroelectronics
Datasheet
Download L99LD01 Datasheet




STMicroelectronics L99LD01
Contents
Contents
L99LD01
1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.1 Operation with an external microcontroller . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.2 Stand alone operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.3 Start-up fail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.4 Normal mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1.5 Software limp home . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1.6 Limp home mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2 Protections and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.2.1 LED current adjust and temperature control . . . . . . . . . . . . . . . . . . . . . 16
2.2.2 Slope compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.2.3 LED chain overvoltage detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.2.4 Battery overvoltage shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.2.5 Regulators thermal shut down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.2.6 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.2.7 Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.2.8 Standby and wake up by ENABLE pin . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.2.9 Frequency setting and dither effect . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.2.10 Start up LED overvoltage management . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.2.11 Programming the over/under voltage threshold . . . . . . . . . . . . . . . . . . . 27
2.2.12 Input overvoltage programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3 SPI functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.1 Serial peripheral interface (ST SPI standard) . . . . . . . . . . . . . . . . . . . . . . 31
3.2 Signal description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.3 SPI protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.3.1 SDI, SDO format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.3.2 Global status byte description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.3.3 Operating code definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.4 Address mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.5 Control registers (RAM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
3.6 Status registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
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STMicroelectronics L99LD01
L99LD01
Contents
4 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6 SPI electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.1 DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.2 AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.3 Dynamic characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
8 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
8.1 ECOPACK® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
8.2 LQFP32™ package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
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