MBI5027CNS [ETC]

16 BIT CONSTANT CURRENT LED SINK DRIVER WITH ERROR DETECTION; 16位LED恒流错误检测驱动程序


型号：	MBI5027CNS
厂家：	ETC
描述：	16 BIT CONSTANT CURRENT LED SINK DRIVER WITH ERROR DETECTION 16位LED恒流错误检测驱动程序驱动
文件：	总24页 (文件大小：452K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MBI5027

Preliminary Datasheet

Macroblock

16-bit Constant Current LED Sink Driver

with Error Detection

Features

MBI5027CNS

MBI5016CNS

· Error Detection mode to detect LED open-circuit errors

· 16 constant-current output channels

· Constant output current invariant to load voltage change

· Excellent output current accuracy:

between channels: ±3% (max.), and

between ICs: ±6% (max.)

MBI5027CF

MBI5016CF

· Output current adjusted through an external resistor

· Constant output current range: 5-90 mA

· Fast response of output current, OE (min.): 200 ns

· 25MHz clock frequency

· Schmitt trigger input

MBI5027CP

MBI5016CP

· 5V supply voltage

Current Accuracy

Conditions

I_OUT= 10 mA ~ 60 mA

Between Channels

Between ICs

< ±3%

< ±6%

ÓMacroblock, Inc. 2003

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 -

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Product Description

MBI5027 succeeds MBI5026 and is designed for LED displays with open-circuit Error Detection

extension. MBI5027 exploits PrecisionDrive™ technology to enhance its output characteristics.

MBI5027 contains a serial buffer and data latches, which convert serial input data into parallel

output format. At MBI5027 output stage, sixteen regulated current ports are designed to provide

uniform and constant current sinks for driving LEDs within a wide range of Vf variations.

While MBI5027 is used in their system design for LED display applications, e.g. LED panels, it

provides users with great flexibility and device performance. Users may adjust the output

current from 5 mA to 90 mA through an external resistor, R_ext, which gives users flexibility in

controlling the light intensity of LEDs. MBI5027 guarantees to endure maximum 17V at the

output port. The high clock frequency, 25 MHz, also satisfies the system requirements of high

volume data transmission.

MBI5027 exploits the idea of Share-I-O™ technology to extend its performance；in addition,

MBI5027 is backward compatible with MBI5026 in both electrical characteristics and package

aspect. With Share-I-O™ technology, users can, without changing the printed circuit board

originally for MBI5026, let MBI5027 enter a special function mode, an Error Detection mode,

just by setting a sequence of signals on LE(ED1), OE (ED2) and CLK input pins. In the Error

Detection mode, MBI5027 detects the status of individual LED connected to MBI5027. The

status will be saved in a built-in register. Then, a system controller may read, through SDO pin,

the error status from the register to know whether LEDs are properly lit or not. By setting

another sequence of signals on LE(ED1), OE (ED2) and CLK input pins, MBI5027 may resume

to a Normal mode and perform as MBI5026. In Application Information, users can get

detailed ideas about how MBI5027 works in the Error Detection mode.

A Share-I-O™ technique is specifically applied to MBI5027. By means of the Share-I-O™

technique, an additionally effective function, Error Detection, can be added to LED drivers,

however, without any extra pins. Thus, MBI5027 could be a drop-in replacement of MBI5026.

The printed circuit board originally designed for MBI5026 may be also applicable for MBI5027.

For MBI5027, the pin 4, LE(ED1), and the pin 21, OE (ED2), can be acted as different functions

as follows:

Device Name

MBI5027

Function Description of Pin 4

LE + Error Detection (ED1)

OE + Error Detection (ED2)

Function Description of Pin 21

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Block Diagram

OUT0 OUT1

OUT14 OUT15

R-EXT

I_ORegulator

VDD

OE(ED2)

LE(ED1)

GND

Control Logic

Output Driver & Error Detector

16-bit Output Latch

CLK

SDI

16-bit Shift Register

SDO

Terminal Description

Pin Configuration

VDD

R-EXT

SDO

GND

SDI

CLK

Pin No.

Pin Name

Function

Ground terminal for control logic and

current sink

GND

LE(ED1)

OE(ED2)

OUT15

OUT14

OUT13

OUT12

OUT11

OUT10

OUT9

OUT0

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

OUT7

SDI

Serial-data input to the Shift Register

Clock input terminal for data shift on

rising edge

CLK

Data strobe input terminal

Serial data is transferred to the

respective latch when LE(ED1) is high.

The data is latched when LE(ED1)

goes low.

OUT8

LE(ED1)

Also, a control signal input for Error

Detection mode (See Timing Diagram)

5~20

Constant current output terminals

Output enable terminal

OUT0 ~OUT15

When (active) low, the output drivers

are enabled; when high, all output

drivers are turned OFF (blanked).

OE (ED2)

SDO

Also, a control signal input for Error

Detection mode (See Timing Diagram)

Serial-data output to the following SDI

of next driver IC

Input terminal used to connect an

external resistor for setting up all output

current

R-EXT

VDD

5V supply voltage terminal

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Equivalent Circuits of Inputs and Outputs

OE(ED2) terminal

LE(ED1) terminal

VDD

CLK, SDI terminal

SDO terminal

VDD

OUT

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Timing Diagram

Normal Mode

N = 0

10 11 12

14 15

CLK

SDI

LE(ED2)

OE(ED2)

OUT0

OUT1

OFF

OUT2

OUT3

OFF

OUT15

SDO

: don’t care

Truth Table (In Normal Mode)

CLK

SDI

D_n

SDO

D_n-15

D_n-14

D_n-13

OUT0… OUT 7… OUT15

Dn ….Dn - 7 ….Dn - 15

D_n+1

D_n+2

D_n+3

No Change

Dn + 2 ….Dn - 5 ….Dn - 13

D^{n + 2}….D^{n - 5}….Dn - 13

Off

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Entering Error Detection Mode

CLK

OE(ED2)

LE(ED1)

The signal sequence makes MBI5027 enter an Error Detection mode.

Reading Error Status Code

CLK

about 2 μs

(ED2)

SDO

: don’t care

Error Status Code

Bit15

Bit14 Bit13 Bit12 Bit11

A system controller can read Error Status codes through SDO pin.

Resuming to Normal Mode

CLK

OE(ED2)

LE(ED1)

Voltage “Low”

The signal sequence makes MBI5027 resume to the Normal mode.

Note:

If users want to know the whole process, that is how to enter the Error Detection mode, read Error

Status codes and resume to the Normal mode, please refer to the contents in Application Information.

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Maximum Ratings

Characteristic

Symbol

V_DD

Rating

0~7.0

-0.4~V_DD+ 0.4

+90

Unit

Supply Voltage

Input Voltage

V_IN

Output Current

Output Voltage

Clock Frequency

GND Terminal Current

I_OUT

V_DS

-0.5~+20.0

F_CLK

I_GND

MHz

1440

CNS – type

CF – type

CP – type

CNS – type

CF – type

CP – type

1.52

Power Dissipation

(On PCB, Ta=25°C)

P_D

1.30

1.11

Thermal Resistance

(On PCB, Ta=25°C)

R_th(j-a)

°C/W

112

Operating Temperature

Storage Temperature

T_opr

T_stg

-40~+85

-55~+150

°C

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Recommended Operating Conditions

Characteristic

Symbol

Condition

Min.

Typ.

Max.

Unit

Supply Voltage

V_DD

4.5

5.0

5.5

Output Voltage

Output Current

V_DS

I_OUT

I_OH

17.0

OUT0~ OUT15

DC Test Circuit

SDO

-1.0

1.0

I_OL

SDO

CLK, OE (ED2),

LE(ED1) and SDI

V_IH

V_IL

0.8V_DD

-0.3

V_DD+0.3

0.3V_DD

Input Voltage

CLK, OE (ED2),

LE(ED1) and SDI

t_w(L)

200

LE(ED1) Pulse Width

CLK Pulse Width

t_w(CLK)

t_w(OE)

OE (ED2) Pulse Width

Setup Time for SDI

Normal Mode

V_DD=4.5~5.5V

su(D)

Hold Time for SDI

Setup Time for LE(ED1)

Hold Time for LE(ED1)

h(D)

su(L)

h(L)

t_w(ED2)

t_w(CLK)

OE (ED2) Pulse Width

CLK Pulse Width

Setup Time for LE(ED1)

su(ED1)

Error Detection Mode

V_DD=4.5~5.5V

Hold Time for LE(ED1)

h(ED1)

Setup Time for OE (ED2)

Hold Time for OE (ED2)

Clock Frequency

su(ED2)

h(ED2)

F_CLK

Cascade Operation

Ta=85°C (CNS type)

Ta=85°C (CF type)

Ta=85°C (CP type)

25.0

0.79

0.67

0.57

MHz

Power Dissipation

P_D

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Electrical Characteristics

Characteristic

Symbol

Condition

Min.

Typ.

Max.

Unit

“H” level

V_IH

V_IL

Ta = -40~85ºC

0.8V_DD

GND

V_DD

Input

Voltage

“L” level

0.3V_DD

Output Leakage Current

I_OH

V_OH=17.0V

0.5

μA

V_OL

V_OH

I_OL=+1.0mA

I_OH=-1.0mA

0.4

Output

SDO

Voltage

4.6

I_OUT1

dI_OUT1

I_OUT2

V_DS=0.6V

R_ext=720 Ω

R_ext=360 Ω

25.0

±1

Output Current 1

Current Skew

I_OL=25mA

V_DS=0.6V

±3

V_DS=0.8V

50.0

±1

Output Current 2

Current Skew

I_OL=50mA

V_DS=0.8V

dI_OUT2

±3

Output Current vs.

Output Voltage Regulation

%/dV_DS

%/dV_DD

V_DSwithin 1.0V and 3.0V

V_DDwithin 4.5V and 5.5V

±0.1

±1

% / V

Output Current vs.

Supply Voltage Regulation

Pull-up Resistor

R_IN(up)

250

500

800

KΩ

OE (ED2)

LE(ED1)

Pull-down Resistor

R_IN(down)

When all output ports sink 20mA

simultaneously

V_{DS, Th1}

V_{DS, Th2}

V_{DS, Th3}

1.0

0.8

1.2

When a single output port sinks

20mA

Open Circuit Error***

Discrimination Voltage

When all output ports sink 50mA

simultaneously

When a single output port sinks

50mA

V_{DS, Th4}

1.0

I_DD(off) 1

I_DD(off) 2

I_DD(off) 3

I_DD(on) 1

I_DD(on) 2

R_ext=Open, OUT0 ~OUT15 =Off

R_ext=720 Ω, OUT0~OUT15 =Off

R_ext=360 Ω, OUT0~OUT15 =Off

R_ext=720 Ω, OUT0 ~OUT15 =On

R_ext=360 Ω, OUT0 ~OUT15 =On

“OFF”

Supply

Current

“ON”

*** To effectively detect the error occurring at the output port, MBI5027 has a built-in current detection

circuit. The current detection circuit will detect the effective current I_{OUT, effective}, and compare the effective

current I_{OUT, effective}, to the target current I_OUT, target, defined by R_ext. If I_{OUT, effective}, is much less than the

target current I_OUT, target, an error flag will be asserted in the built-in Shift Register. The minimum voltage

requirement for such current detection is VDS, Th1, VDS, Th2, VDS, Th3 and VDS, Th4.

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Test Circuit for Electrical Characteristics

IDD

IOUT

VDD

OUT0

OE(ED2)

IIH,IIL

CLK

LE(ED1)

OUT15

SDI

SDO

GND

R -EXT

VIH, VIL

Iref

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Switching Characteristics

Characteristic

Symbol

Condition

Min.

Typ.

Max.

Unit

t_pLH1

t_pLH2

t_pLH3

t_pLH

100

CLK - OUTn

LE(ED1) -OUTn

Propagation Delay Time

(“L” to “H”)

OE (ED2) -OUTn

CLK - SDO

V_DD=5.0 V

V_DS=0.8 V

V_IH=V_DD

V_IL=GND

R_ext=300 Ω

V_L=4.0 V

R_L=52 Ω

C_L=10 pF

t_pHL1

t_pHL2

t_pHL3

t_pHL

150

CLK - OUTn

LE(ED1) -OUTn

OE (ED2) -OUTn

CLK - SDO

Propagation Delay Time

(“H” to “L”)

200

CLK

t_w(CLK)

t_w(L)

t_w(OE)

t_h(L)

Pulse Width

LE(ED1)

OE (ED2)

Hold Time for LE(ED1)

Setup Time for LE(ED1)

Maximum CLK Rise Time

Maximum CLK Fall Time

Output Rise Time of Iout

Output Fall Time of Iout

t_su(L)

t_r**

500

200

120

t_f**

t_or

t_of

**If the devices are connected in cascade and t_ror t_fis large, it may be critical to achieve the timing required for

data transfer between two cascaded devices.

Test Circuit for Switching Characteristics

IDD

IOUT

VDD

VIH, VIL

OUT0

OE(ED2)

CLK

Function

Generator

LE(ED1)

OUT15

SDI

SDO

GND

R -EXT

Logic input

waveform

VIH = 5V

VIL = 0V

Iref

tr = tf =10 ns

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Timing Waveform

Normal Mode

t_W(CLK)

50%

CLK

t_su(D)

t_h(D)

50%

SDI

SDO

50%

t_W(L)

t_pLH_,t_pHL

50%

LE(ED1)

t_h(L)

t_su(L)

LOW = OUTPUTS ENABLED

OE(ED2)

OUTn

HIGH = OUTPUT OFF

LOW = OUTPUT ON

50%

t_pLH1_,t_pHL1

t_pLH2_,t_pHL2

t_W(OE)

50%

OE(ED2)

OUTn

t_pLH3

t_pHL3

90%

50%

10%

90%

50%

10%

t_or

t_of

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Entering Error Detection Mode

t_W(CLK)

50%

CLK

t_h(ED2)

t_su(ED2)

50%

OE(ED2)

LE(ED1)

t_su(ED1)t_h(ED1)

50%

2 CLK

Reading Error Status Code

50%

CLK

OE(ED2)

50%

t_w(ED2)

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Application Information

Constant Current

To design LED displays, MBI5027 provides nearly no variations in current from channel to

channel and from IC to IC. This can be achieved by:

1) The maximum current variation between channels is less than ±3% and that between ICs is

less than ±6%.

2) In addition, the current characteristic of output stage is flat and users can refer to the figure

as shown below. The output current can be kept constant regardless of the variations of LED

forward voltages (Vf). This performs as a complete function of the load regulation.

100.00

90.00

80.00

70.00

60.00

50.00

40.00

30.00

20.00

10.00

0.00

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

1.1 1.2 1.3 1.4 1.5

2.5

V_DS(V)

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Adjusting Output Current

The output current of each channel (I_OUT) is set by an external resistor, R_ext. The relationship

between I_outand R_extis shown in the following figure.

I_OUT(mA)

100

V_DS= 1.0V

500

1000

1500

2000

2500

3000

3500

4000

Resistance of the external resistor, R_ext, in Ω

Also, the output current in milliamps can be calculated from the equation:

I_OUTis (625/ R_ext) x 28.8, approximately,

where R_ext, in Ω, is the resistance of the external resistor connected to R-EXT terminal.

The magnitude of current is around 50mA at 360Ω and 25mA at 720Ω.

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Entering Error Detection Mode

CLK

OE(ED2)

LE(ED1)

Each time the system controller sends the sequence patterns shown above, MBI5027 can enter

the Error Detection mode. During this phase, the system controller can still send data through

SDI pin.

The state of OE(ED2) and LE(ED1) is sampled by the rising edge of each CLK. We use “0”

and “1” to represent the state of “Voltage Low” and “Voltage High” respectively. The states of

the successive five OE (ED2) and LE(ED1) are (1, 0), (0, 0), (1, 0), (1, 1) and (1, 0).

Reading Error Status Code

CLK

about 2 μs

OE(ED2)

SDO

Error Status Code

Bit15

Bit14 Bit13 Bit12 Bit11

Once entering the Error Detection mode, the Error Detection takes place by changing the state

of OE(ED2) from “Voltage High” to “Voltage Low”. The built-in current detection circuit will

detect the effective current I_OUT, effective of each output channel, and compare it to the target

current I_OUT, target, defined by R_ext. If the I_OUT, effective , is much less than the target current I_OUT, target,

an error status code will be represented as “0” state. During the period of detecting errors, data

cannot be sent into MBI5027 through SDI pin. The “Voltage Low” state of OE(ED2) requires at

least three “0” of which the last “0” should be at least 2μs after the falling edge of OE(ED2).

The occurrence of the last “0” results in the event that MBI5027 saves the error status in the

built-in register. The mentioned state of each “0” is sampled by the rising edge of each CLK.

Before the error status saved in the built-in register is read, the state of OE (ED2) should be

pulled up from “Voltage Low” to “Voltage High”. Then, by sending CLK, MBI5027 shifts out,

through SDO pin, the error status bit by bit.

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Resuming to Normal Mode

CLK

OE(ED2)

LE(ED1)

Voltage “Low”

Each time the system controller sends the sequence patterns shown above, MBI5027 can

resume to the Normal mode. During this phase, the system controller can still send data

through SDI pin.

The state of OE(ED2) and LE(ED1) is sampled by the rising edge of each CLK. We use “0”

and “1” to represent the state of “Voltage Low” and “Voltage High” respectively. The states of

the successive five OE (ED2) and LE(ED1) are (1, 0), (0, 0), (1, 0), (1, 0) and (1, 0).

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Timing Chart for Error Detection Mode (An Example)

N x MBI5027 are connected in cascade, ie, SDO, k --> SDI, k+1.

And, all MBI5027 ICs are connected to the same CLK, LE(ED1) and OE (ED2)

signals.

LED j, j = 0… (N x16 –1)

SDO, 2

SDO, N-1

SDO, 0 SDI, 1

SDO, 1

SDI, 0

MBI5027, 0

MBI5027, 1

MBI5027, 2

MBI5027, N-1

MBI5027, N-2

CLK

LE(ED1)

(ED2)

3 CLK Pulses Required (Note 2)

t_h(L)

N x 16 CLK Pulses (Note 1)

N x 16 CLK Pulses (Note 3)

CLK

SDI, 0

Don’t Care

SDI, 0

Could Be “Don’t Care”

N x 16 -1

Serial Data (Note 1)

T1 = 2 CLK

T2 = 2µs

LE(ED1)

T3 (Note 2)

(ED2)

SDO, 0

SDO, 1

N x 16 -2

N x 16

SDO, N-1

Entering the Error

Detection Mode

Sending the Normal Image Data (or Test Data)

Serial Data k, k = 0… (N x 16 –1)

Detecting the Error Status

Reading Back the Error Status Code

Resuming to the

Normal Mode

Note 2:

Note 3:

T1 = 2 CLK pluses is required to start the error detection.

T2 = 2 μs is required to obtain the stable error status result.

T3 = the third CLK pulses is required before OE (ED2) goes

Note 1: N x 16 CLK pulses before the

next LE shift the valid image data. N x

16 “1”s are suggested.

The first rising edge of CLK after the rising edge of OE (ED2) starts shifting the Ima

Data with LED Error. An LED error will be represented by a “0”, to over write the

original image data “1”. Image Data k, k = 0… (N x 16 –1), = all “1” is suggested.

N x 16 CLK pulses shift all N x 16 error results (Error Status Code) via Node SDO, N

voltage high. The rising edge of CLK writes the error status code

back to the MBI5027 built-in shift register.

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Package Power Dissipation (P_D)

The maximum allowable package power dissipation is determined as P_D(max) = (Tj – Ta) /

R_th(j-a). When 16 output channels are turned on simultaneously, the actual package power

dissipation is P_D(act) = (I_DDx V_DD) + (I_OUTx Duty x V_DSx 16). Therefore, to keep P_D(act) ≤

P_D(max), the allowable maximum output current as a function of duty cycle is:

I_OUT= { [ (Tj – Ta) / R_th(j-a)] – (I_DDx V_DD) } / V_DS/ Duty / 16,

where Tj = 150°C.

(A) I_out= 90mA, V_DS= 1.0V, 16 output channels active

For CNS type package, the thermal resistance is R_th(j-a)= 82 (°C/W)

Iout vs. Duty Cycle at Rth = 82 (°C/W)

100

Ta = 25°C

Ta = 55°C

Ta = 85°C

Duty Cycle

For CF type package, the thermal resistance is Rth(j-a) = 96 (°C/W)

Iout vs. Duty Cycle at Rth = 96 (°C/W)

100

Ta = 25 ℃

Ta = 55 ℃

Ta = 85 ℃

Duty Cycle

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

For CP type package, the thermal resistance is R_th(j-a)= 112 (°C/W)

Iout vs. Duty Cycle at Rth = 112 (°C/W)

100

Ta = 25°C

Ta = 55°C

Ta = 85°C

Duty Cycle

(B) I_out= 60mA, V_DS= 0.8V, 16 output channels active

For CNS type package, the thermal resistance is R_th(j-a)= 82 (°C/W)

Iout vs. Duty Cycle at Rth = 82 (°C/W)

Ta = 25°C

Ta = 55°C

Ta = 85°C

Duty Cycle

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

For CF type package, the thermal resistance is R_th(j-a)= 96 (°C/W)

Iout vs. Duty Cycle at Rth = 96 (°C/W)

Ta = 25°C

Ta = 55°C

Ta = 85°C

Duty Cycle

For CP type package, the thermal resistance is R_th(j-a)= 112 (°C/W)

Iout vs. Duty Cycle at Rth = 112 (°C/W)

Ta = 25°C

Ta = 55°C

Ta = 85°C

Duty Cycle

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

The maximum power dissipation, P_D(max) = (Tj-Ta) / R_th(j-a), decreases as the ambient

temperature increases.

Max. Power Dissipation at Various Ambient Temperature

1.6

1.4

1.2

0.8

0.6

0.4

0.2

CNS Type: Rth = 82

CF Type: Rth = 96

CP Type: Rth = 112

-40 -30 -20 -10

Ambient Temperature

Load Supply Voltage (V_LED)

MBI5027 are designed to operate with V_DSranging from 0.4V to 1.0V considering the package

power dissipating limits. V_DSmay be higher enough to make P_D(act)> P_D(max)when V_LED= 5V

and V_DS= V_LED– Vf, in which V_LEDis the load supply voltage. In this case, it is recommended to

use the lowest possible supply voltage or to set an external voltage reducer, V_DROP

A voltage reducer lets V_DS= (V_LED– Vf) – V_DROP

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

V_LED

V_DROP

V_DS

MBI5027

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

Package Outlines

MBI5027CNS Outline Drawing

SDIP-24-P-300-1.78

Units: mm

Weight: 1.11g (typ)

MBI5027CF Outline Drawing

SOP-24-P-300-1.00

Units: mm

Weight: 0.28g (typ)

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April 2003, V0.8-4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

MBI5027CP Outline Drawing

SSOP24-P-150-0.64

Units: mm

Weight: 0.11g (typ)

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April 2003, V0.8-4

MBI5027CNS [ETC]

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