aoz1960 Alpha & Omega Semiconductor, aoz1960 Datasheet - Page 4

• Manufacturer Part Number: aoz1960
• Description: Multi-string Boost White Led Driver
• Manufacturer: Alpha & Omega Semiconductor

Pin Description
Pin Number
Rev. 1.0 August 2010
5, 8, 19
13, 14
23, 24
10
12
15
16
17
18
20
21
22
11
1
2
3
4
6
7
9
Pin Name
COMP
AGND
PGND
ABRT
DBRT
FSEL
LED6
LED5
LED4
LED3
LED2
LED1
BIAS
ISET
OVP
FLT
LIN
EN
LX
IN
Input Supply Pin.
Enable Input. Pull EN above 2V to enable the LED driver and pull EN below 0.8V to disable
the LED driver.
Internal 5V Linear Regulator Output. Connect a minimum 0.22μF ceramic capacitor from
BIAS to ground.
LED Current Set Pin. Connect a resistor from ISET to ground to set the nominal LED
current (100% brightness) for each string.
Analog ground.
Compensation Pin. COMP is the output of the internal error amplifier. Connect a
RC network from COMP to ground to compensate the control loop.
Frequency Select Pin. Connect FSEL to ground via a resistor to set the switching
frequency.
Analog Brightness Control Input. ABRT controls the LED brightness by adjusting the LED
current in proportion to ABRT voltage. The input range of ABRT is between 0 to 2V. When
VBRT is below 0.2V, the LED current is 10% of the nominal setting. When BRT voltage is
2V or above, the LED current is 100% of the normal setting.
PWM Brightness Control Input. DBRT controls the LED brightness by turning the LED on
and off using a PWM signal. The brightness is proportional to the PWM duty.
Fault Output. FLT is an open-drain output. Connect a pull-up resistor between BIAS and
FLT.
Over-voltage protection Input. Use a voltage divider to set the boost regulator output
over-voltage protection threshold.
Boost Regulator Switching Pin. LX is the drain of the 55V internal boost switch.
Power Ground.
Internal LED Current Regulator 1 Input.
Internal LED Current Regulator 2 Input.
Internal LED Current Regulator 3 Input.
Internal LED Current Regulator 4 Input.
Internal LED Current Regulator 5 Input.
Internal LED Current Regulator 6 Input.
Boost Regulator Input Pin. LIN is drain of the input protection switch.
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Pin Function
AOZ1960
Page 4 of 20