MPQ3386- 50V, 6 STRINGS WHITE LED DRIVERS, AEC-Q100 QUALIFIED
PIN FUNCTIONS
Pin #
Name Description
1
EN
Enable Control Input. Do not let this pin floating.
Switching Frequency Selection Input. When float this pin or connect this pin to VCC, the
step-up converter switching frequency is 1.25MHz. When connect this pin to GND, the
step-up converter switching frequency is 625kHz.
2
3
OSC
Dimming PWM Frequency Set. Connect a capacitor between FSET and GND to set the
DPWM frequency by the equation: fDPWM=3.5uF/CFSET. The frequency of DPWM is
recommended to be set from 100Hz to 2kHz.
FSET
PWM Filter Output. To use external PWM dimming mode, connect a capacitor between
PWMO and GND to form a low-pass filter with an internal 400kΩ resistor. It filters the
external PWM logic signal on PWMI pin into a DC signal whose level is inversely
4
PWMO proportional to the duty-cycle of the input PWM signal and then the DC signal is translated
into a duty-cycle of the dimming PWM. To use DC input PWM dimming mode, directly
apply a DC voltage from 0.2V to 1.2V on PWMO pin for dimming PWM duty cycle control.
The DC input PWM dimming polarity is negative.
5
6
GND
Analog Ground.
PWM Signal Input. To use external PWM dimming mode, apply a PWM signal on this pin
for brightness control. This signal is filtered and its duty cycle is converted into a DC signal
to calculate the DPWM duty cycle. And the DPWM duty cycle equals to the input PWM duty
cycle. To use DC input PWM dimming mode, float this pin.
PWMI
LED String 6 Current Input. This pin is the open-drain output of an internal dimming control
switch. Connect the LED String 6 cathode to this pin. If this string is not used, connect Vout
to this pin.
7
LED6
LED String 5 Current Input. This pin is the open-drain output of an internal dimming control
switch. Connect the LED String 5 cathode to this pin. If this string is not used, connect Vout
to this pin.
8
9
LED5
LED4
LED String 4 Current Input. This pin is the open-drain output of an internal dimming control
switch. Connect the LED String 4 cathode to this pin. If this string is not used, connect Vout
to this pin.
LED String 3 Current Input. This pin is the open-drain output of an internal dimming control
switch. Connect the LED String 3 cathode to this pin. If this string is not used, connect Vout
to this pin.
10
11
12
LED3
ISET
LED2
LED Current Set. Tie a current setting resistor from this pin to ground to program the
current in each LED string. ILED = 1.21V / RSET
LED String 2 Current Input. This pin is the open-drain output of an internal dimming control
switch. Connect the LED String 4 cathode to this pin. If this string is not used, connect Vout
to this pin.
LED String 1 Current Input. This pin is the open-drain output of an internal dimming control
switch. Connect the LED String 3 cathode to this pin. If this string is not used, connect Vout
to this pin.
13
LED1
14
15
NC
No Connection.
Vout
Voltage Output. Connect this pin to output.
MPQ3386 Rev. 1.0
5/24/2016
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
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