ISL97684 Intersil Corporation, ISL97684 Datasheet - Page 4

• Manufacturer Part Number: ISL97684
• Description: (ISL97682 - ISL97684) Compact 2-3-4-Ch LED Drivers
• Manufacturer: Intersil Corporation

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Pin Descriptions
PIN
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
DirectPWM
ISL97682
FPWM/
AGND
COMP
PWMI
PGND
RSET
FSW
VDC
OVP
CH1
CH2
VIN
EN
NC
NC
LX
DirectPWM
ISL97683
FPWM/
AGND
COMP
PWMI
PGND
RSET
FSW
VDC
OVP
CH1
CH2
CH3
VIN
EN
NC
LX
DirectPWM
ISL97684
FPWM/
4
COMP
AGND
PWMI
PGND
RSET
FSW
VDC
OVP
CH1
CH2
CH3
CH4
VIN
EN
LX
ISL97682, ISL97683, ISL97684
Analog Ground for precision circuits
External Compensation Pin
Resistor connection for setting LED current, (see Equation 2 for calculating the ILEDpeak)
FSW = 0 ~ 0.25 * VDC, Boost Switching Frequency = 600kHz with phase shift and PFM mode enabled.
FSW = 0.25 * VDC ~ 0.5 * VDC, Boost Switching Frequency = 600kHz with phase shift and PWM mode
enabled.
FSW = 0.5 * VDC ~ 0.75 * VDC, Boost Switching Frequency = 1MHz with phase shift and PWM mode
enabled.
FSW = 0.75 * VDC ~ VDC, Boost Switching Frequency = 1MHz with phase shift and PFM mode enabled.
PWM brightness control pin.
Enable, can be tied directly to VIN if the system lacks of I/O
LED and Driver Supply Voltage. LED supply and Driver supply can be separated if high voltage application
is needed and dual supplies are available
External PWM dimming with frequency modulation or Direct PWM dimming without frequency
modulation.
With a resistor connected to ground, the dimming frequency will be set by the Setting Resistor.
When this pin is floating, the part enters Direct PWM mode such that the dimming follows the input PWM
signal without frequency modulation.
Input to boost switch
Power ground (LX, C
De-couple capacitor for internally generated 5V supply
Overvoltage protection input
Input 1 to current source, CH, and monitoring
Input 2 to current source, CH, and monitoring (ISL97682 is No Connect)
Input 3 to current source, CH, and monitoring
Input 4 to current source, CH, and monitoring (ISL97682, ISL97683 are No Connect)
IN
, and C
OUT
Power return)
DESCRIPTION
March 11, 2011
FN7689.0