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PDF MB6656 Data sheet ( Hoja de datos )
| Número de pieza | MB6656 | |
| Descripción | 1A Dimmable LED Driver | |
| Fabricantes | Macroblock | |
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Preliminary Datasheet
MB6656
Step-Down, 1A Dimmable LED Driver
Features
6~40V wide input voltage range
Maximum 1A constant output current
PWM/ DC input for dimming control
Hysteretic PFM operation eliminates external compensation design
Integrated power switch with 0.3ohm low Rds(on)
Full protections: UVLO/ Start-Up/ OCP/ Thermal/
LED Open/Short-Circuit
Only 5 external components required
Package MSL Level: 3
Surface Mount Device
GSD: TO-252-5L
Small Outline Transistor
Product Description
MBI6656 is a step-down constant-current high-brightness LED driver to
provide a cost-effective design solution for interior/exterior illumination
applications. It is designed to deliver constant current to light up high power
LED with only 5 external components. With hysteretic PFM control scheme,
MBI6656 eliminates external compensation design and makes the design
simple.
GST: SOT-23-6L
GSB: SOT-89-5L
Small Outline Package
The output current of MBI6656 can be programmed by an external resistor
and dimmed via pulse width modulation (PWM) or DC voltage through DIM pin
to achieve higher efficiency linear current modulation.
GD: SOP8L-150-1.27
MBI6656 features completed protection design to handle faulty situations. The start-up function limits the inrush
current while the power is switched on. Under voltage lock out (UVLO), over temperature protection (OTP), and
over current protection (OCP) guard the system to be robust and keep the driver away from being damaged which
results from LED open-circuited, short-circuited and other abnormal events. Besides SOT-236 small package,
MBI6656 provides thermal-enhanced SOT-89, SOP-8 and TO-252 packages as well to handle power dissipation
more efficiently.
Applications
Signage and Decorative LED Lighting
High Power LED Lighting
Constant Current Source
Macroblock, Inc. 2015
6F-4, No.18, Pu-Ting Rd., Hsinchu, Taiwan 30072, R.O.C.
TEL: +886-3-579-0068, FAX: +886-3-579-7534 E-mail: [email protected]
-1-
April 2015, V1.00
1 page  
MBI6656
Step-Down, 1A Dimmable LED Driver
Electrical Characteristics
VIN=12V, VOUT=3.6V, L1=68μH, CIN=COUT=10μF, TA=25°C; unless otherwise specified.
Characteristics
Symbol
Condition
Min.
INPUT AND OUTPUT
Supply Voltage
Supply Current
Start-Up Voltage
Under Voltage Lock Out
Voltage
HYSTERESIS CONTROL
Mean Sense Voltage
Sense Voltage threshold
hysteresis
Internal Propagation
Delay Time
MOS SWITCH
VIN
IIN
VSU
VUVLO
-
VIN=6V~40V
-
-
VSENSE
VSENSE,HYS
-
-
TPD -
6
-
-
-
95
-
100
Switch ON Resistance
Minimum Switch ON
Time*
Rds(on)
TON,min
Minimum Switch OFF
Time*
Recommended Duty
Cycle Range of SW*
TOFF,min
Dsw
Maximum Operating
frequency
FreqMax
THERMAL OVERLOAD
Thermal Shutdown
Threshold*
TSD
Thermal Shutdown
Hystersis*
TSD-HYS
PWM DIMMING
Input
voltage of
PWMD
“H” level
“L” level
VIH
VIL
Duty Cycle Range of
PWM Signal Applied to
DIM pin
DutyPWM
ANALOG DIMMING
Analog Dimming Input
Clamp Voltage
Analog Dimming Input
Voltage turn off SW
VDIM.CLAMP
VDIM. SWOFF
OVER CURRENT PROTECTION
VIN=12V
-
-
-
-
-
-
-
-
PWM Frequency: 1kHz
-
-
-
20
40
145
20
2.5
-
0
-
-
Over Current Threshold* OCP
-
-
*Parameters are not tested at production. Parameters are guaranteed by design.
Typ.
-
-
5.4
5.3
100
15
200
0.3
300
300
-
-
165
30
-
-
-
2.5
0.3
2.5
Max.
40
2
-
-
105
-
320
0.4
-
-
80
1000
175
40
40
0.3
100
-
-
-
Unit
V
mA
V
V
mV
%
ns
Ω
ns
ns
%
kHz
°C
°C
V
V
%
V
V
A
April 2015, V1.00
-5-
5 Page 
MBI6656
Step-Down, 1A Dimmable LED Driver
1200
1000
800
VIN = 12V, 1-LED
L1 = 100uH
fDIM = 1kHz
600
RSEN = 0.1Ω
RSEN = 0.14Ω
400 RSEN = 0.28Ω
200
0
0%
20% 40% 60% 80% 100%
PWM dimming duty, %
120
VIN = 12V, 1-LED
100
L1 = 100uH
fDIM = 1kHz
80
60
RSEN = 0.1Ω
RSEN = 0.14Ω
40 RSEN = 0.28Ω
20
0
0%
2% 4% 6% 8%
PWM dimming duty, %
10%
Fig. 15 PWM dimming curve
B. Analog dimming
Users can also apply DC voltage directly to DIM for modulating LED current. The result is shown in the following
figures.
1200
1000
VIN = 12V, 1-LED
L1 = 100uH
RSEN = 0.1Ω
800
600 RSEN = 0.14Ω
400 RSEN = 0.28Ω
200
0
0 0.5 1 1.5 2 2.5
Analog voltage, V
Fig. 16 Analog dimming curve
Component Selection
A. 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
L1
( VIN
-
VLED
)
VLED
VIN
0.3 fS ILED
When selecting an inductor, not only the inductance but also the saturation current that should be considered as
the factors to affect the performance of module. 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,
the inductance and saturation current become a trade-off at the same inductor size. An inductor with shield is
recommended to reduce the EMI interference. However, this is another trade-off with heat dissipation.
B. Schottky Diode Selection
The MBI6656 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
- 11 -
April 2015, V1.00
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MB6656.PDF ] | |
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