L99LD01 datasheet(5/69 Pages) STMICROELECTRONICS

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L99LD01

List of figures

Figure 1.

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 2.

Connection diagram (top view – not in scale) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3.

Operating modes, main states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 4.

Normal start up vs VS ramp up and VCC1 voltage dips. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 5.

VCC1_FAIL or VCC1 reset under voltage (VS >VSMIN) at start up . . . . . . . . . . . . . . . . . . . . 14

Figure 6.

VCC1 reset under voltage at start up (VS < VSMIN) and fast VS ramp down . . . . . . . . . . . . 15

Figure 7.

Slow vs ramp down. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 8.

Internal structure of the slope compensation circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 9.

Operation with a standalone LIN and ENABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 10.

Operation with PM device and ENABLE (FSO active Low) . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 11.

Internal structure of main converter oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 12.

Converter frequency range vs RSF and IRSF vs frequency . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 13.

Correct start UP with no LED overvoltage failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 14.

LED overvoltage after tDStart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 15.

Device behavior in case the low to high transition of PWM_L signal happens after tDStart

expiration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 16.

LED overvoltage event not caused by a VS overvoltage event . . . . . . . . . . . . . . . . . . . . . 26

Figure 17.

LED overvoltage detection due to a possible battery VS overvoltage . . . . . . . . . . . . . . . . 27

Figure 18.

Behavior of LED overvoltage recovery bit with low on-time of PWM_L . . . . . . . . . . . . . . . 27

Figure 19.

LED chain overvoltage thresholds settings. An example for boost and fly back converters28

Figure 20.

Input overvoltage programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 21.

Clock polarity and clock phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 22.

SPI global error information output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 23.

SPI write operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 24.

SPI read operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 25.

SPI read and clear operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 26.

SPI read device information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 27.

Principle of the WD_Status bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Figure 28.

Voltage and current conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Figure 29.

SPI timing parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Figure 30.

SPI input and output timing parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Figure 31.

SPI maximum clock frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Figure 32.

NRES pin open drain structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Figure 33.

Handshake procedure at start up with microcontroller on board . . . . . . . . . . . . . . . . . . . . 58

Figure 34.

Boost application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Figure 35.

Fly back application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Figure 36.

Buck-boost application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Figure 37.

Stand alone application example for boost topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Figure 38.

Reverse battery protection: an example for boost topology . . . . . . . . . . . . . . . . . . . . . . . . 63

Figure 39.

External MOS required during PWM dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Figure 40.

LQFP32™ package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

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