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PDF MBI6653 Data sheet ( Hoja de datos )
| Número de pieza | MBI6653 | |
| Descripción | 1A Dimmable LED Driver | |
| Fabricantes | Macroblock | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MBI6653 (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
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Macroblock
Preliminary Datasheet
MBI6653
Step-Down, 1A Dimmable LED Driver
Features
6~36V wide input voltage range
Maximum 1A constant output current
Patented fixed frequency analog dimming control
- PWM-controlled brightness modulation
- DC voltage-controlled brightness modulation
97% efficiency @ input voltage 12V, 350mA, 3-LED
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
Mini Small Outline Package
GMS : MSOP-8L-118mil
Small Outline Package
GD: SOP8L-150-1.27
Product Description
MBI6653 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 6 external components. With hysteretic PFM control scheme, MBI6653 eliminates external compensation
design and makes the design simple.
The output current of MBI6653 can be programmed by an external resistor and dimmed via pulse width modulation
(PWM) through PWMD pin. In addition, a novel fixed frequency analog dimming method is proposed and offered by
the device. Users can achieve higher efficiency linear current modulation from 5% to 100% of preset current by
applying either PWM-controlled or DC voltage-controlled brightness modulation.
MBI6653 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. MBI6653 provides thermal-enhanced MSOP-8
and SOP-8 packages as well to handle power dissipation more efficiently.
Applications
Signage and Decorative LED Lighting
High Power LED Lighting
Constant Current Source
Macroblock, Inc. 2014
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 - February 2014, V2.00
1 page  
MBI6653
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
INPUT AND OUTPUT
Supply Voltage
Supply Current
Symbol
VIN
IIN
Condition
-
VIN=6V~36V
Min.
6
-
Start-Up Voltage
Under Voltage Lock Out
Voltage
HYSTERESIS CONTROL
Mean Sense Voltage
Sense Voltage threshold
hysteresis
Internal Propagation
Delay Time
MOS SWITCH
Switch ON Resistance
Minimum Switch ON
Time*
Minimum Switch OFF
Time*
Recommended Duty
Cycle Range of SW*
Maximum Operating
frequency
THERMAL OVERLOAD
Thermal Shutdown
Threshold*
Thermal Shutdown
Hystersis*
VSU
VUVLO
-
-
VSENSE
VSENSE,HYS
-
-
TPD -
Rds(on)
TON,min
TOFF,min
Dsw
FreqMax
VIN=12V; refer to test circuit (b)
-
-
-
-
TSD
TSD-HYS
-
-
5.5
4.3
95
-
100
0.2
-
-
20
40
145
20
PWM DIMMING ( Control by PWMD)
Input voltage “H” level
of PWMD
“L” level
Duty Cycle Range of
PWM Signal Applied to
PWMD pin
VIH
VIL
DutyPWMD
-
-
PWM Frequency: 1kHz
Internal Pull Up Resistor
RPWMD
-
ANALOG DIMMING (Control by PWMA, ADJ)
Input voltage “H” level
of PWMA
“L” level
Duty Cycle Range of
PWM Signal Applied to
PWMA pin
VIH
VIL
DutyPWMA
-
-
PWM Frequency: 1kHz on PWMA
Internal Pull Up Resistor
Analog Dimming Input
Clamp Voltage
RPWMA
VADJ.CLAMP
DC voltage: ADJ
Analog Dimming Input
Voltage turn off SW
VADJ SWOFF DC voltage: ADJ
2.2
-
1
1.25
-
10
-
-
-
OVER CURRENT PROTECTION
Over Current Threshold* OCP
-
-
*Parameters are not tested at production. Parameters are guaranteed by design.
Typ. Max. Unit
- 36 V
1 2 mA
5.7 5.9
V
4.5 4.7
V
100 105 mV
15 - %
200 320 ns
0.3 0.4 Ω
200 - ns
200 - ns
- 80 %
- 1000 kHz
165 175 °C
30 40 °C
-
-
-
100k
5.5 V
0.4 V
100 %
Ω
-
-
-
100k
1.5
0.2
5.5
0.5
100
-
-
-
V
V
%
Ω
V
V
1.8 - A
February 2014, V2.00
-5-
5 Page 
MBI6653
Step-Down, 1A Dimmable LED Driver
Brightness Control
A. PWM dimming (PWMD)
The dimming of LEDs can be performed by applying PWM signals to PWMD pin. A logic low (below 0.5V) at PWMD
disables the internal MOSFET and shuts off the current flow to the LED array. An internal pull-up circuit ensures that
the MBI6653 is ON when PWMD pin is unconnected. Therefore, the need for an external pull-up resistor will be
eliminated. The following Fig. 38 shows good linearity in dimming control.
1200
1000
800
600
400
200
0
0
(a) PWM dimming signal is applied on PWMD
20
18
16
14
12
10
8
6
4
2
200
400
600
Steps
800
1000
1200
0
0
5 10 15
Steps
(a) 0~1024 Steps
(b) 0~20 Steps
Fig. 38 PWMD duty cycle: 0% ~ 100%
20
B. Analog Dimming
MBI6653 features patented fixed frequency analog dimming technique, which maintains high efficiency in light
loading condition. The technique also benefits users for simple EMI practice and better SNR (Signal-to-Noise
Rejection Ratio) when the brightness control is performed. There are two ways to achieve analog dimming control
when applying MBI6653 as described in the following paragraphs.
- 11 -
February 2014, V2.00
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet MBI6653.PDF ] | |
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