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PDF MBI6662 Data sheet ( Hoja de datos )
| Número de pieza | MBI6662 | |
| Descripción | Common Anode Step-Down LED Driver | |
| Fabricantes | Macroblock | |
| Logotipo |  |
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Macroblock
Preliminary Datasheet
MBI6662
60V/2A, Common Anode Step-Down LED Driver
Features
Maximum 2A constant output current
>95% efficiency @ input voltage 36V, load condition: 2A, 10 LEDs
4.5V~60V wide input voltage range
Common anode connection
Adaptive hysteretic PFM with adjustable fixed frequency operation
Tunable output current
Integrated power switch with 0.2Ω on-resistance
Full protections: UVLO/OCP/ Thermal/ LED Open-/ LED Short- Circuited
Dual Flat No-lead
GDF: DFN-10L 3*3
Small Outline Package
Product Description
MBI6662 is a high efficiency, constant current and step-down DC/DC converter. It
is designed to deliver constant current to light up high power LEDs. With the
adaptive hysteretic PFM control scheme, MBI6662 can achieve constant
frequency operation under common anode connection.
GD: SOP-10L-150
The output current of MBI6662 can be set by an external resistor, and LED brightness can be controlled via a pulse
width modulation (PWM) signal through DIM pin. In addition, the soft-start function limits the inrush current while the
power is turned on. MBI6662 also features under voltage lock out (UVLO), over temperature protection (OTP), and
over current protection (OCP) to ensure system robustness and prevent IC and LEDs from being damaged once
any abnormal condition occurs.
To ensure system reliability, MBI6662 is equipped with thermal shutdown protection (TSD), which protects IC from
overheating by turning off the internal MOSFET. MBI6662 is available in thermal-enhanced DFN-10 and SOP-10
package to handle power dissipation more efficiently.
Applications
Stage Lighting
High Power LED Wall-Washer
Automotive LED Lighting
Parallel Lighting Fixtures Connected by Common-Anode Scheme
Macroblock, Inc. 2014
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 - September 2014, V1.01
1 page  
MBI6662
60V/2A, Common Anode Step-Down LED Driver
Electrical Characteristics
Test condition: VIN=12V, VOUT=3.6V, L1=68μH, CIN=COUT=10μF, CVCC=1μF, TA=25°C; unless otherwise specified.
Characteristics
Symbol
Condition
Min. Typ. Max. Unit
DC Characteristics
Supply Voltage
Supply Current
Output Current
Output Current Accuracy
MOSFET On-Resistance
MOSFET Leakage
Efficiency
Switching Characteristics
VIN
IDD
IOUT
dIOUT/IOUT
RDS,ON
ILEAK
-
-
VIN=4.5V~60V, FSW=100kHz
Refer to page 19 for derating.
0.35A≤IOUT≤2A
IOUT=350mA
VLX=60V
VIN=36V, IOUT=2A, 10LEDs
4.5
-
-
-
-
-
-
-
1.5
-
±2
0.2
0.1
95
60 V
2.5 mA
2.0 A
±5 %
0.5 Ω
1.0 μA
-%
LX Rise Time
LX Fall Time
Recommended Duty Cycle
Operating Frequency
Current Sense
TR_LX
TF_LX
DLX
FSW
-
-
-
-
--
--
10
0.1 -
20 ns
20 ns
90 %
1.0 MHz
Mean Sense Voltage
Low Side Hysteresis
High Side Hysteresis
CSP Propagation Delay
CSN Propagation Delay
High Side Blanking Time
Low Side Blanking Time
Thermal Shutdown (TSD)
VCS -
95 100 105 mV
VCSP
Normalize to average current
5
-
80 %
VIN-VCSN Normalize to average current
5
-
80 %
TPPD
LX tights to VIN
- 100 - ns
TNPD
LX tights to GND
- 100 - ns
TLEB_H
-
- 280 - ns
TLEB_L
-
- 180 - ns
Thermal Shutdown Threshold* TSD
Thermal Shutdown Hysteresis* TSD-HYS
Under Voltage Lock-out (UVLO)
-
-
145 155 175 °C
20 30 40 °C
UVLO Voltage
VUVLO
Start Up Voltage
VSTUP
Over Current Protection (OCP)
TA=-40~85°C
-
- 4.1 -
- 4.4 -
V
V
Over Current Threshold*
-
- 3.0 -
A
PWM Dimming
PWM Duty Cycle Range
PWM Signal High Level
PWM Signal Low Level
Regulator
DDIM
PWM frequency:0.1kHz~1kHz 1
- 100 %
VIH_DIM
VIN=4.5V~60V
2.5 -
-V
VIL_DIM
VIN=4.5V~60V
- - 0.8 V
Regulated Voltage
VCC VIN=4.5V,ILOAD=2mA
VCC VIN=6V~60V, ILOAD=2mA
- 4.2
4.5 5.0
-
5.5
V
V
*Parameters are not tested at production. Parameters are guaranteed by design.
- 5 - September 2014, V1.01
5 Page 
MBI6662
60V/2A, Common Anode Step-Down LED Driver
Application Information
MBI6662 is a simple and high-efficiency buck converter with the capability of driving up to 2A current load. The
adaptive hysteretic PFM control topology simplifies external circuit design to achieve constant frequency operation
while possessing fast load transient response. The common-anode connection effectively reduces necessary wires
in applications of multiple power modules in parallel. MBI6662 also equips with Under Voltage Lock-Out (UVLO),
Over Temperature Protection (OTP), and Over Current Protection (OCP) to prevent the convertor from being
damaged under abnormal operations.
Setting Output Current
In conventional hysteretic PFM topology, the switching frequency varies with input voltage and output loading.
MBI6662 provides an innovative constant frequency technique to alleviate the sensitivity of switching frequency.
From equation (1), ∆HYS must be adjustable to achieve constant frequency under various input voltage supposed
inductance LS, VLED and ILED are fixed. In other words, MBI6662 dynamically adjusts the hysteretic window, ∆HYS,
from 5% to 80% to achieve constant switching frequency.
fS
=
(VIN
-
VLED )
VLED
VIN
∆HYS × L × ILED
.............................................................................................. (1)
where fS is the switching frequency and ∆HYS=∆IHYS/ILED, and ∆IHYS is the current variation in hysteretic control as
shown in Fig.17.
IL
IHYS_H
∆IHYS
ILED
∆IHYS
IHYS_L
VCSP
VHYS_H
t
VSEN
VCSN
Fig.17 Typical switching waveforms of MBI6662
t
VVINVHYSSE_NL++VVIINN
t
- 11 -
September 2014, V1.01
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet MBI6662.PDF ] | |
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