MBI5170CD datasheet, PDF - EEWORLD Datasheet

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MBI5170CD: Description8-Bit Constant Current LED Sink Driver with Gain Control; File Size401KB，24 Pages; ManufacturerETC

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MBI5170CD Overview

8-Bit Constant Current LED Sink Driver with Gain Control

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Macroblock

Datasheet

MBI5170

8-Bit Constant Current LED Sink Driver

with Gain Control

Features

Compatible with MBI5168 in package and electrical characteristics

Exploit

Share-I-O™

technique to provide two operation modes:

Normal Mode with the same functionality as MB5168,

Current Adjust Mode to program output current gain

8 constant-current output channels

Output current adjustable through an external resistor

Constant output current range: 5 -120 mA

Excellent output current accuracy,

between channels <

±3%

(max.), and

between ICs <

±6%

(max.).

Constant output current invariant to load voltage change

Fast response of output current,

OE (min.): 200 ns @I

out

< 60mA

OE (min.): 400 ns @I

out

= 60~100mA

25MHz clock frequency

Schmitt trigger input

3.3V~ 5V supply voltage

256-step run-time programmable output current gain

suitable for white balance application

MBI5170CDW

MBI5168CDW

SOP16-150-1.27 Weight：0.13g

P-DIP16-300-2.54 Weight：1.02g

M B

MBI5168CN

I5 0 0 1

MBI5170CN

MBI5001CN

MBI5001CD

MBI5170CD

MBI5168CD

MBI5001CD

SOP16-300-1.27 Weight：0.37g

MBI5168CP

MBI5170CP

Current Accuracy

Between Channels

±3%

Between ICs

±6%

Conditions

OUT

= 10 ~ 100 mA,

= 0.8V, V

= 5.0V

SSOP16-150-0.64 Weight：0.07g

©Macroblock,

Inc. 2004

Floor 6-4, No.18, Pu-Ting Rd., Hsinchu, Taiwan 30077, ROC.

TEL: +886-3-579-0068, FAX: +886-3-579-7534, E-mail:

info@mblock.com.tw

-1-

August 2004, VA.00

MBI5170

8-Bit Constant Current LED Sink Driver with Gain Control

Product Description

MBI5170 succeeds MBI5168 and also exploits

PrecisionDrive™

technology to enhance its output characteristics.

Furthermore, MBI5170 uses the idea of

Share-I-O™

technique to make MBI5170 backward compatible with

MBI5168 in both package and electrical characteristics and extend its functionality for run-time LED current gain

control in LED display systems.

MBI5170 contains an 8-bit Shift Register and an 8-bit Output Latch, which convert serial input data into parallel

output format. At MBI5170 output stages, eight regulated current ports are designed to provide uniform and

constant current sinks with small skew between ports for driving LED’s with a wide range of forward voltage (Vf)

variations. Users may adjust the output current from 5 mA to 120 mA with an external resistor R

ext

, which gives

users flexibility in controlling the light intensity of LED’s. MBI5170 guarantees to endure maximum 17V at the

output ports. Besides, the high clock frequency up to 25 MHz also satisfies the system requirements of high

volume data transmission.

By means of the

Share-I-O™

technique, MBI5170 adds new functionality on the pins LE and

of MBI5168 to

provide an additional function, Current Gain Control, without any extra pins. Thus, MBI5170 could be a drop-in

replacement of MBI5168. The printed circuit board originally designed for MBI5168 may be also applied to

MBI5170. In MBI5170 there are two operation modes and three phases: Normal Mode phase, Mode Switching

transition phase, and Current Adjust Mode phase. The signal on the multi-function pin

/SW would be monitored.

Once a one-clock-wide short pulse appears on the pin

/SW, MBI5170 would enter the Mode Switching phase.

At this moment, the voltage level on the pin LE/MOD/CA is used for determining the next mode to which MBI5170

is going to switch.

In the Normal Mode phase, MBI5170 has similar functionality to MBI5168. The serial data could be transferred into

MBI5170 via the pin SDI, shifted in the Shift Register, and go out via the pin SDO. The LE/MOD/CA can latch the

serial data in the Shift Register to the Output Latch.

/SW would enable the output drivers to sink current.

On the other hand, the Current Adjust Mode phase allows users to adjust the output current level by setting a

run-time programmable Configuration Code. The code is sent into MBI5170 via the pin SDI. The positive pulse of

LE/MOD/CA would latch the code in the Shift Register into a built-in 8-bit Configuration Latch, instead of the Output

Latch. The code would affect the voltage at the terminal R-EXT and control the output current regulator. The output

current could be adjusted finely by a current gain ranging from (1/12) to (127/128) in 256 steps. Hence, the current

skew between IC’s can be compensated within less than 1% and this feature is suitable for white balancing in LED

color display panels.

Pin Assignment

GND

SDI

CLK

LE/MOD/CA

OUT 0

OUT1

OUT2

OUT3

VDD

R-EXT

SDO

OE/SW

OUT7

OUT6

OUT5

OUT4

-2-

August 2004, VA.00

MBI5170CD Related Products

	MBI5170CD	MBI5170	MBI5170CN	MBI5170CDW	MBI5170CP
Description	8-Bit Constant Current LED Sink Driver with Gain Control	8-Bit Constant Current LED Sink Driver with Gain Control	8-Bit Constant Current LED Sink Driver with Gain Control	8-Bit Constant Current LED Sink Driver with Gain Control	8-Bit Constant Current LED Sink Driver with Gain Control

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