MBI5025CD View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

MBI5025CD

16-bit Constant Current LED Sink Driver

Unspecified 

MBI5025

16-bit Constant Current LED Sink Driver

Package Power Dissipation (PD)

The maximum allowable package power dissipation is determined as PD(max) = (Tj – Ta) / Rth(j-a).

When 16 output channels are turned on simultaneously, the actual package power dissipation is

PD(act) = (IDD x VDD) + (IOUT x Duty x VDS x 16). Therefore, to keep PD(act) ≤ PD(max), the

allowable maximum output current as a function of duty cycle is:

IOUT = { [ (Tj – Ta) / Rth(j-a) ] – (IDD x VDD) } / VDS / Duty / 16, where Tj = 150°C.

Load Supply Voltage (VLED)

MBI5025 are designed to operate with VDS ranging from 0.4V to 0.8V (IOUT=5~35mA)

considering the package power dissipating limits. VDS may be higher enough to make PD(act) >

PD(max) when VLED = 5V and VDS = VLED – Vf, in which VLED is the load supply voltage. In this

case, it is recommended to use the lowest possible supply voltage or to set an external voltage

reducer, VDROP.

A voltage reducer lets VDS = (VLED – Vf) – VDROP.

Resistors or Zener diode can be used in the applications as shown in the following figures.

VLED

VDROP

Vf

VDS

MBI5025

VLED

VDROP

Vf

VDS

MBI5025

- 11 -

January 2004, V0.9

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