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FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
SETUP INPUT (SETUP)
When this pin is taken high, the differential interface
programs the data registers and the device is in the setup
mode.
RESET_SCAN INPUT (RESET_SCAN)
This pin is taken high at the start of each frame to reset the
internal counter.
DATA LATCH (LS)
When this pin is pulsed, the PWM data in each of the
Sample and Hold blocks is transferred to the corresponding
PWM controller to start the PWM for the LED driver, and
increase the internal counter by 1 in each LED driver device.
SHUT_B
When this pin is high, the boost and LED drivers are
enabled.
BOOST CLOCK INPUT (SYNC_IN)
The Boost converter frequency can be synchronized to an
external signal if provided at this pin. If this pin is connected
to ground, an On-Chip oscillator is used to generate the boost
frequency.
PWM SYNC CONNECTIONS (SYNC_PWM)
When the IC is operated as a Master, the resulting clock
for PWM pulse generation is output on this pin. For Slave
chips, this pin acts as an input for the reference clock for the
PWM generator.
DECOUPLED INTERNAL GATE DRIVER VOLTAGE
BOOST DRIVER SLEW RATE CONTROL (SLEW)
This pin is used to control the slew rate on the OUT_SW
pin for different application needs. The slew rate can be
adjusted by connecting a resistor with a value of 4.7 k, 14 k,
or 24 k, from this pin to GND.
Q-FET CONTROL (GD)
This pin is used to control the ON/OFF operation of the
Q-FET.
BOOST COMPENSATION (COMP)
Boost converter compensation network connects to this
pin.
POWER MOSFET DRIVER OUTPUT (OUT_SW)
Boost converter power MOSFET driver output.
CURRENT SENSE (CS)
Boost power MOSFET current is sensed across a resistor
connected to this pin and ground, as well as for over-current
protection (OCP) and current sensing for current mode
control.
USER PRGRAMABLE OVER-VOLTAGE
PROTECTION (OVP)
Over-voltage protection sense pin.
SWITCH DRIVER POWER SUPPLY (PVCC)
Input voltage pin that can range from 6.0 to 14 V and used
to power the LED drivers and gate drive for the boost
controller.
(VDC)
This pin is for internal use only, and not to be used for other
purposes. A capacitor of 2.2 μ F is connected between this
pin and ground for decoupling purposes.
34848
Analog Integrated Circuit Device Data
Freescale Semiconductor
15
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