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Macroblock
Features
Preliminary Datasheet
MBI1801
All-Ways-OnTM High-Power LED Driver
Through Hole
Constant output current invariant to supply and load voltage change Maximum output constant current: 1.2A Output current adjusted through an external resistor Built-in thermal protection 5V supply voltage Package type: "Pb-free" package
PTO: TO-220-5L
Product Description
MBI1801 is an instant On/Off LED driver for high power LED applications and exploits PrecisionDriveTM and All-Ways-OnTM technology to enhance its output characteristics. At MBI1801 output stage, one regulated current port is designed to provide a uniform and constant current sink for driving LEDs within a large range of VF variations. With All-Ways-OnTM, MBI1801 easily provides users a consistent current source. Users may adjust the output current from 50 mA up to 1.2A through an external resistor, Rext, which gives users flexibility in controlling the light intensity of LEDs. In addition, users can precisely adjust LED brightness from 0% to 100% via output enable ( OE )
with Pulse Width Modulation. MBI1801 also guarantees that LEDs can be cascaded to maximum 17V at the output port. Additionally, to ensure the system reliability, MBI1801 is built with Thermal Protection (TP) function. The TP function protects IC from over temperature (150C). Also, the TO package enhances the power dissipation. As a result, a large amount of current can be sunk safely in one package.
Macroblock, Inc. 2005 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 -1August 2005, V1.00
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MBI1801
Applications
High-flux LED lighting
All-Ways-OnTM High-Power LED Driver
Function Block Diagram
OUT R-EXT
VDD
IO Regulator
Thermal Sensor
1 switch
OE
Figure 1
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MBI1801
Pin Configuration
All-Ways-OnTM High-Power LED Driver
Thermal Pad
MBI1801
1
2
3
4
5
OE
VDD
GND
Rext
OUT
MBI1801PTO
Pin Description
Pin No. Pin Name Function
Output enable terminal 1 OE When OE is active (low), the output is enabled; when OE is inactive (high), the output is turned OFF (blanked). 5V supply voltage terminal Ground terminal for control logic and current sink Terminal used to connect an external resistor (Rext) for setting up output current for the output channel Constant current output terminal Power dissipation terminal connected to GND*
2 3 4 5 -
VDD GND R-EXT
OUT
Thermal Pad
*To eliminate the noise influence, the thermal pad is suggested to be connected to GND on PCB. In addition, desired thermal conductivity will be improved, if a heat-conducting device is screwed with thermal pad.
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MBI1801
Maximum Ratings
Characteristics
All-Ways-OnTM High-Power LED Driver
Symbol
Rating
Unit
Supply Voltage Input Voltage Output Current Sustaining Voltage GND Terminal Current Power Dissipation (Ta=25) Thermal Resistance (Ta=25) Operating Temperature Operating Junction Temperature Storage Temperature TO-220-5L
VDD VIN IOUT VDS IGND PD Rth(j-a) Topr Tj,max Tstg
0~7.0 -0.4~VDD + 0.4 1440 -0.5~+17.0 1440 1.6 60 -40~+85 125 -55~+150
V V mA V mA W C/W C C C
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MBI1801
All-Ways-OnTM High-Power LED Driver
Electrical Characteristics
Characteristics Symbol Condition Min. Typ. Max. Unit
Supply Voltage Sustaining Voltage at OUT pin Output Current Input Voltage "H" level "L" level
VDD VDS IOUT VIH,OE VIL,OE IOH IOUT dIOUT/IOUT IOUT dIOUT/IOUT
OUT when OE = 5V = VDD DC Test Circuit Ta= -40~85C Ta= -40~85C VOH= 17.0V VDS= 0.6V IOUT= 488mA VDS= 0.6V VDS= 0.8V IOUT= 976mA VDS= 0.8V Rext= 2.4k Rext= 2.4k Rext= 1.2k Rext= 1.2k
4.5 50 0.7VDD GND 200 -
5.0 488 976 0.1 1 500 5 6 8 6 7 150
5.5 17.0 1200* VDD 0.3VDD 2.0 6 6 800 8 8 11 8 10 -
V V mA V V A mA % mA % %/V %/V k
Output Leakage Current Output Current 1 Chip Skew 1 Output Current 2 Chip Skew 2 Regulation of Output Current vs. Sustaining Voltage Regulation of Output Current vs. Supply Voltage
OE Pull-up Resistor
%/dVDS VDS within 1.0V and 3.0V %/dVDD RIN(up) IDD(off) 1 VDD within 4.5V and 5.5V OE Rext= Open, OUT =Off Rext=2.4k, OUT = Off Rext=1.2k, OUT= Off Rext=2.4k, OUT= On Rext=1.2k, OUT= On When Tj approaches Tx and OUT is shut off.
"OFF" Supply Current "ON" Junction Temperature Threshold
IDD(off) 2 IDD(off) 3 IDD(on) 1 IDD(on) 2 Tx
mA
C
* The output current, IOUT, can be driven up to 1440mA, if a heat-conducting device is applied.
Test Circuit for Electrical Characteristics
IDD VDD CL
Function Generator Logic Input Waveform VIH,OE VIL,OE
VDD OE R-EXT GND OUT
VDS
IOUT
VLED
CL
Figure 2
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MBI1801
All-Ways-OnTM High-Power LED Driver
Switching Characteristics
Characteristic Symbol Condition Min. Typ. Max. Unit
Propagation Delay Time ("L" to "H") Propagation Delay Time ("H" to "L") Pulse Width
OE - OUT OE - OUT OE
tpLH tpHL tw(OE) tor tof
Output Rise Time of OUT (turn off) Output Fall Time of OUT (turn on)
VDD= 5.0 V VDS= 1V VIH,OE= VDD VIL,OE= GND Rext= 1200 (IOUT =976mA) VL= 4.0 V RL= 2.622 CL= 10 pF
0.3 0.3 1 0.3 0.3
0.5 0.5
1 1
s s s
0.5 0.5
1 1
s s
Test Circuit for Switching Characteristics
CL IDD VDD Function Generator Logic Input Waveform VIH,OE VIL,OE IR-EXT OE R-EXT GND OUT VDS CL VL VDD
IOUT RL
Figure 3
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MBI1801
Application Information
All-Ways-OnTM High-Power LED Driver
Typical Application Circuits
MBI1801 application circuit
VDROP
V LED* C2 100uF + VDS 5 R2*** LED1 LEDn
U1 R1** 1 2 D1 5.1V C1 0.1uF 3 OE VDD GND REXT OUT
4 REXT
MBI1801
Figure 4 * VLED > VDS + VF,LED x n; VF,LED: Forward voltage of LED; n: LED count ** R1 = (VLED - 5.1V) / IDD; refer to Electrical Characteristics for IDD *** R2 = [VLED -VDS - (VF,LED x n)] / ILED
MBI1801 application circuit with brightness control by PWM signal
LED1 V LED* C2 100uF + V DS 5 LEDn
U1 1 VDD C1 0.1uF 2 3 OE VDD GND REXT OUT
4 REXT
MBI1801
Figure 5 * VLED = VDS + VF,LED x n; VF,LED: Forward voltage of LED; n: LED count
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MBI1801
All-Ways-OnTM High-Power LED Driver
Constant Current
In LED lighting applications, MBI1801 provides nearly no variation in current from IC to IC. This can be achieved by: 1) The maximum current variation 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 guarantees LED to be performed on the same brightness as user's specification.
1600 1400 1200 IOUT (mA) 1000 800 600 400 200 0 0.0 0.5 1.0 VDS (V) 1.5 2.0 2.5
Figure 6
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MBI1801
Setting Output Current
All-Ways-OnTM High-Power LED Driver
The output current of each channel (IOUT) is set by an external resistor, Rext. The relationship between IOUT and Rext is shown in the following figure.
1400 1200 1000 IOUT (mA) 800 600 400 200 0 0 5 10 REXT (k) 15 20 25
Figure 7 Also, the output current can be calculated from the equation: VR-EXT = 1.24V Rext = (VR-EXT / IOUT) x 945 = (1.24V / IOUT) x 945, IOUT = (VR-EXT / Rext) x 945 = (1.24V / Rext) x 945 within 6% chip skew where Rext is the resistance of the external resistor connected to R-EXT terminal and VR-EXT is the voltage of R-EXT terminal. The magnitude of current (as a function of Rext) is around 976mA at 1200 and 488mA at 2400.
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MBI1801
All-Ways-OnTM High-Power LED Driver
Soldering Process of "Pb-free" Package Plating*
Macroblock has defined "Pb-Free" to mean semiconductor products that are compatible with the current RoHS requirements and selected 100% pure tin (Sn) to provide forward and backward compatibility with both the current industry-standard SnPb-based soldering processes and higher-temperature Pb-free processes. Pure tin is widely accepted by customers and suppliers of electronic devices in Europe, Asia and the US as the lead-free surface finish of choice to replace tin-lead. Also, it is backward compatible to standard 215C to 240C reflow processes which adopt tin/lead (SnPb) solder paste. However, in the whole Pb-free soldering processes and materials, 100% pure tin (Sn) will all require up to 260oC for proper soldering on boards, referring to J-STD-020C as shown below.
Temperature () 300 255 250 240 217 200 Average ramp-up rate= 0.7/s 150 100s max 30s max Ramp-down 6/s (max) 260+0 -5 2455
100 Average ramp-up rate = 0.4/s 50 25 0 0 50 ----Maximum peak temperature Recommended reflow profile 100
Peak Temperature 245~260< 10s
Average ramp-up rate= 3.3/s
150
200
250 Time (sec)
300
Acc.J-STD-020C
*Note1: For details, please refer to Macroblock's "Policy on Pb-free & Green Package".
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MBI1801
All-Ways-OnTM High-Power LED Driver
Package Power Dissipation (PD)
The maximum power dissipation, PD(max) = (Tj,max - Ta) / Rth(j-a), decreases as the ambient temperature increases.
Maximum Power Dissipation at Various Ambient Temperature (Tj = 125; Rth(j-a)=60/W) 1.80 1.60 Power Dissipation (W) 1.40 1.20 1.00 0.80 0.60 0.40 0.20 0.00 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Ambient Temperature ()
Safe Operation Area
Figure 8 The maximum allowable package power dissipation is determined as PD(max) = (Tj,max - Ta) / Rth(j-a). When OUT is turned on, the actual package power dissipation is PD(act) = (IDD x VDD) + (IOUT x Duty x VDS). 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, where Tj = 125C; Duty= tON / T; tON: the time of LEDs turning on; T: OE signal period
tON
OE
T
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MBI1801
All-Ways-OnTM High-Power LED Driver
Load Supply Voltage (VLED)
MBI1801 is designed to operate with adequate VDS to achieve constant current. VDS together with IOUT should not exceed the package power dissipation limit, PD(max). As in Figure 4, VDS = VLED - VF, and VLED is the load supply voltage. PD(act) will be greater than PD(max), if VDS drops too much voltage on the driver. 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. The resistor,R2, can be used in the applications as shown in Figure 4.
TP Function (Thermal Protection)
When the junction temperature exceeds the threshold, TX (150C), TP function turns off the output current. Thus, the junction temperature starts to decrease. As soon as the temperature is below 150C, the output current will be turned on again. The on-state and off-state switch at a high frequency; thus, the blinking is imperceptible. However, the average output current is limited, and therefore, the driver is protected from being overheated.
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MBI1801
Outline Drawing
All-Ways-OnTM High-Power LED Driver
D IM E N S IO N S REF. A b D c E L4 M illim e te r M in . 4 .4 0 0 .7 6 8 .6 0 0 .3 6 9 .8 0 1 4 .7 0 M ax. REF. 4 .8 0 c 1 1 .0 0 L 5 9 .0 0 L 0 .5 0 e 1 0 .4 0 L 1 1 5 .3 0 M illim e te r M in . 1 .2 5 6 .2 0 1 3 .2 5 2 .6 0 3 .7 1 1 .7 0 R E F . 2 .8 9 3 .9 6 M ax. 1 .4 5 6 .6 0 1 4 .2 5
TO-220-5L Note: The unit for the outline drawing is mm.
Product Top-mark Information
The first row of printing MBIXXXX Part number ID number The second row of printing XXXXXXX
Manufacture Device Version Code Code
Product No. Process Code
G: Green and Pb-free P: Pb-free
Product Revision History
Datasheet version V1.00 Device version code A
Product Ordering Information
Part Number MBI1801PTO Package Type TO-220-5L Weight (g) 1.959 August 2005, V1.00
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