LDS8865002-T2-200/200/200 Leadis Technology, LDS8865002-T2-200/200/200 Datasheet - Page 7

• Manufacturer Part Number: LDS8865002-T2-200/200/200
• Description: LED Drivers 6-Ch Ultra Low Drop PowerLite Current Rg
• Manufacturer: Leadis Technology

Specifications of LDS8865002-T2-200/200/200

• High Level Output Current: 120 mA
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Supply Current: 1.7 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFN-16
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LDS8865
BLOCK DIAGRAM
BASIC OPERATION
At power-up, device performs internal circuits reset
that requires less than 10µs. To start device either
PWM1 or PWM2 pin should be set logic high 10µs
later than input voltage applied. Device starts
operating at 1x mode at which the output is
approximately equal to the input supply voltage (less
any internal voltage losses). If the output voltage is
sufficient to regulate all LED currents, the device
remains in 1x operating mode.
If the input voltage is insufficient or falls to a level
where the regulated currents cannot be maintained,
the
automatically switches into 1.5x mode after a fixed
delay time of about 400
voltage is approximately equal to 1.5 times the input
supply voltage (less any internal voltage losses).
This sequence repeats at every mode until driver
enters the 2x mode.
© 2007 Leadis Technology
Characteristics subject to change without notice
low
dropout
PowerLite
μ
s. In 1.5 mode, the output
Current
Figure 2. LDS8865 Functional Block Diagram
Regulator
7
If the device detects a sufficient input voltage is
present to drive all LED currents in 1x mode, it will
change automatically back to 1x mode. This only
applies for changing back to the 1x mode. The
difference between the input voltage when exiting 1x
mode and returning to 1x mode is called the 1x mode
transition hysteresis (about 500mV).
LED Current Setting
The maximum current value in each of the three LED
banks is factory preset in respect with customer’s
order. Allowable values are from 0.5mA to 32mA in
0.5mA steps. However, average current value may
be decreased using PWM modulation. LDS8865
allows modulation frequiencies in the range from
100Hz to 10kHz with dutycycle from 1% to 100%.
Lower than 100Hz modulation frequiencies are not
Doc. No. 8865DS, Rev. 2