LED7708 STMicroelectronics, LED7708 Datasheet - Page 8

• Manufacturer Part Number: LED7708
• Description: LED Lighting Drivers 16 Ch 85mA LED 3.6 to 36V 250kHz
• Manufacturer: STMicroelectronics

Specifications of LED7708

• Rohs: yes

Pin function
Table 2.
8/53
11
12
13
14
15
16
17
18
19
20
21
22
23
25
26
27
28
29
30
31
32
33
34
35
24
Pin
SLOPE
COMP
ISETH
XMSK
SGND
AGND
SYNC
FOSC
ISETL
XOVF
CH10
CH11
CH12
CH13
CLIM
FSW
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
CH9
Pin description (continued)
Internal DAC overflow I/O. Used for extended output voltage regulation and fault
management in multi-device applications. It is used to inform slave devices that the
maximum output voltage has been reached. A 100 k pull-up resistor to LD03 is required.
Fault detection masking I/O. This signal is used for extended output voltage regulation &
fault management in multi-device applications. It is used to avoid incorrect fault detection
by forcing slave devices to ignore LED-short detection during output voltage steering. A
100 k pull-up resistor to LD03 is required.
Switching frequency selection / synchronization input. Used to set the desired switching
frequency of the boost controller. Also used as synchronization input.
Boost converter synchronization output. The buffered switching clock signal is provided at
this pin to eventually synchronize other SMPS in the host system.
Dimming oscillator frequency. A resistor to ground sets the frequency of the internal
grayscale clock dimming oscillator. If set high, the internal dimming oscillator is disabled
and the GSCK pin becomes the clock input (see GSCK pin).
Boost section current limit setting. A resistor between this pin and SGND sets the boost
converter current limit.
Slope compensation setting. A resistor between this pin and SGND is required to set the
proper amount of slope compensation to avoid sub-harmonic instability.
Transconductance amplifier output. Connect a simple RC series between this pin and
SGND to properly compensate the loop-gain of the boost converter.
Output current setting (on). Connect a resistor between this pin and SGND to set the
current sunk by each channel during the on-phase of the dimming.
Output current setting (off). Connect a resistor between this pin and SGND to set the
current sunk by each channel during the off-phase of the dimming (LED biasing). Connect
to LDO3 to disable the bias current.
Signal ground. Common return for signals and settings.
Analog Ground. Common return for the current generators (channels).
Driver output (channel) #1.
Driver output (channel) #2.
Driver output (channel) #3.
Driver output (channel) #4.
Driver output (channel) #5.
Driver output (channel) #6.
Driver output (channel) #7.
Driver output (channel) #8.
Driver output (channel) #9.
Driver output (channel) #10.
Driver output (channel) #11.
Driver output (channel) #12.
Driver output (channel) #13.
Doc ID 022698 Rev 1
Function
LED7708