L99LDLH32 datasheet(30/142 Pages) STMICROELECTRONICS

30 / 142 page

Functional description

L99LDLH32

30/142

DS12879 Rev 6

Figure 9. Output & PWM control concept DIN

Dimming with power line

In the L99LDLH32, PWM dimming through power line is possible by rectifying the VS supply

and connecting the Power Line to the Direct Inputs through resistor divider. A buffer

capacitor on VS supply pin has to be able to supply the device during PWM off state to keep

it in operating mode without any reset.

When dimming through power line is performed, PWM frequency is expected in the range of

[100÷200Hz] with 5% minimum duty cycle. The start-up time for light function availability is

tSTARTUP_PWM_VS.

The tSTARTUP_PWM_VS parameter is the time needed for device startup, from device power

up (presence of VS) to the channel activation.

5.3

Protections and diagnostic

5.3.1

Diagnostic availability and validation - strategy

The L99LDLH32 performs a configurable blanking time for the diagnosis, which is applied

on the first channel turn on as well as on each PWM rising edge.

There are 2 configuration bits per function group (DIAG_BLANK_x - see FTP/RAM memory

map, Chapter 7) to set the desired blanking time before validating any fault related to the

channel.

The possible configuration is reported in the table below.

DIN= [0]?

Outx off

Yes

PWM_FS_ALL= [0]?

Outx on

Yes

PWM_DC_½

pin = [1]?

Duty cycle applied on

OUTx

Yes

Duty cycle applied on

OUTx

(1) <=PWM_DUTY_ALL_ALT

(*)

(2) <= PWM_FREQ_DIN

(3) <= duty applied

(1) <=PWM_DUTY_ALL

(**)

(2) <= PWM_FREQ_DIN

(3) <= duty applied

(1) <=don’t care

(2) <= don’t care

(3) <= 1 (100%)

(1) <=don’t care

(2) <= don’t care

(3) <= 0 (0%)

Notes:

(*) the PWM_DUTY_ALL_ALT is exponential (such value is related only to Fail Safe mode)

(**) in Fail Safe mode, the PWM_DUTY_ALL is exponential

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