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PDF MBI6650 Data sheet ( Hoja de datos )
| Número de pieza | MBI6650 | |
| Descripción | 1.2A DC/DC Converter | |
| Fabricantes | Macroblock | |
| Logotipo |  |
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Macroblock
Preliminary Datasheet
Features
z 1.2A Constant Output Current
z 93% Efficiency @ input voltage 13V, 350mA, 3-LED
z 9~36V Input Voltage Range
z Hysteretic PFM Improves Efficiency at Light Loads
z Settable Output Current
www.DataShzeet4UI.ncotemgrated Power Switch
z Full Protection: Thermal/UVLO/Soft Start/LED Open-/Short- Circuit
z Only 4 External Components Required
MBI6650
1.2A DC/DC Converter
Surface Mount Device
PSD: TO-252-5L
Product Description
The MBI6650 is a high efficiency, constant current, step-down DC/DC converter, designed to deliver constant
current to high power LED with only 4 external components. The MBI6650 is specifically designed with hysteretic
PFM control scheme to enhance the efficiency up to 93%. Output current of the MBI6650 can be programmed by
an external resistor, and LED dimming can be controlled via pulse width modulation (PWM) through DIM pin. In
addition, the embedded soft start function eliminates the inrush current while the power is on. The MBI6650 also
features under voltage lock out (UVLO), over temperature protection, LED open-circuit protection and LED
short-circuit protection to protect IC from being damaged.
Additionally, to ensure the system reliability, the MBI6650 is built with the thermal protection (TP) function and a
thermal pad. The TP function protects IC from over temperature (140°C). Also, the thermal pad enhances the
power dissipation. As a result, a large amount of current can be handled safely in one package.
Applications
z Signage and Decorative LED Lighting
z Automotive LED Lighting
z High Power LED Lighting
z Constant Current Source
Macroblock, Inc. 2007
Floor 6-4, No.18, Pu-Ting Rd., Hsinchu, Taiwan 30077, ROC.
TEL: +886-3-579-0068, FAX: +886-3-579-7534 E-mail: [email protected]
- 1 - October 2007, V1.00
1 page  
MBI6650
1.2A DC/DC Converter
Typical Performance Characteristics
Please refer to Typical Application Circuit, VIN=12V, L1=47uH, CIN=COUT=10uF, TA=25°C, unless otherwise specified.
1-LED VF=3.6V; 2-LED VF=7.2V; 3-LED VF=10.8V; 4-LED VF=14.4V; 5-LED VF=18V
1. Efficiency vs. Input Voltage at Various Load Current
100
95
90
85
80
75
70
9 12 15 18 21 24 27 30 33
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Input Voltage (V)
Figure 4. Efficiency vs. VIN @ 350mA, L1=47uH
95
90
85
80
75
70
65
60
9
12 15 18 21 24 27 30 33
Input Voltage (V)
Figure 6. Efficiency vs. VIN @ 1000mA, L1=47uH
2. Line Regulation
380
375
370
365
360
355
350
345
340
9 12 15 18 21 24 27 30
Input Voltage (V)
Figure 8. Line regulation @ 350mA, L1=47uH
33
1-LED
2-LED
3-LED
4-LED
5-LED
36
100
95
90
85
80
75
70
9
12 15 18 21 24 27 30 33
Input Voltage (V)
Figure 5. Efficiency vs. VIN @ 700mA, L1=47uH
95
90
1-LED
85
2-LED
3-LED
4-LED
5-LED
80
75
70
65
60
36 9 12 15 18 21 24 27 30 33
Input Voltage (V)
Figure 7. Efficiency vs. VIN @ 1200mA, L1=47uH
1-LED
2-LED
3-LED
4-LED
5-LED
36
750
740
730
720
710
700
690
680
670
9
12 15 18 21 24 27 30 33
Input Voltage (V)
Figure 9. Line regulation @ 700mA, L1=47uH
1-LED
2-LED
3-LED
4-LED
5-LED
36
1-LED
2-LED
3-LED
4-LED
5-LED
36
1-LED
2-LED
3-LED
4-LED
5-LED
36
1150
1100
1050
1000
1-LED
2-LED
3-LED
4-LED
5-LED
950
9 12 15 18 21 24 27 30 33 36
Input Voltage (V)
1450
1400
1350
1300
1250
1200
1150
1100
9
1-LED
2-LED
3-LED
4-LED
5-LED
12 15 18 21 24 27 30 33 36
Input Voltage (V)
Figure 10. Line regulation @ 1000mA, L1=47uH
Figure 11. Line regulation @ 1200mA, L1=47uH
- 5 - October 2007, V1.00
5 Page 
MBI6650
1.2A DC/DC Converter
TP Function (Thermal Protection)
When the junction temperature exceeds the threshold, TX (140°C), TP function turns off the output current. Thus,
the junction temperature starts to decrease. As soon as the temperature is below 140°C, the output current will be
turned on again. The on-state and off-state switch are 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.
Inductor Selection
The inductance is determined by two factors: the switching frequency and the inductor ripple current. The
calculation of the inductance, L1, can be described as
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L1> (VIN
-
VOUT
-
VSEN
- (Rds(on)
x IOUT )) x
D
fSW x
∆IL
where
Rds(on) is the on-resistance of internal MOSFET of the MBI6650. The typical is 0.8Ω at 12VIN.
D is the duty cycle of the MBI6650, D=VOUT/VIN.
fSW is the switching frequency of the MBI6650.
△IL is the ripple current of inductor, △IL=(1.3xIOUT)–(0.7xIOUT)=0.6xIOUT.
When selecting an inductor, the inductance is not the only factor to affect the performance of module, but the
saturation current also needs to be considered. In general, it is recommended to choose an inductor with 1.5 times
of LED current as the saturation current. Also, the larger inductance gains the better line/load regulation. However,
when at the same inductor size, the inductance and saturation current becomes a trade-off. An inductor with shield
is recommended to reduce the EMI interference, but this is another trade-off with heat dissipation.
Schottky Diode Selection
The MBI6650 needs a flywheel diode, D1, to carry the inductor current when the MOSFET is off. The
recommended flywheel diode is schottky diode with low forward voltage for better efficiency. Two factors determine
the selection of schottky diode. One is the maximum reverse voltage, and the recommended rated voltage of the
reverse voltage is at least 1.5 times of input voltage. The other is the maximum forward current, which works when
the MOSFET is off, and the recommended forward current is 1.5 times of output current.
Input Capacitor Selection
The input capacitor, CIN, can supply pulses of current for the MBI6650 when the MOSFET is on, and CIN is charged
by input voltage when the MOSFET is off. As the input voltage is lower than the tolerable input voltage, the internal
MOSFET of the MBI6650 becomes constantly “on”, and the LED current is limited to 1.3 times of normal current.
Therefore the key factor in input capacitor selection is the minimum input voltage, which can be tolerated. The
minimum input capacitor (CIN, MIN) can be calculated by the following equation
CIN, MIN
= 1.3
x IOUT
x
D x TS
VIN - VIN, MIN
where
VIN, MIN is the tolerable input voltage, VIN, MIN=VIN–VOUT, MAX.
The rated voltage of input capacitor should be at least 1.5 times of input voltage. A tantalum or ceramic capacitor
can be used as an input capacitor. The advantages of tantalum capacitor are high capacitance and low ESR. The
- 11 -
October 2007, V1.00
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MBI6650.PDF ] | |
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