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PDF MBI6904 Data sheet ( Hoja de datos )
| Número de pieza | MBI6904 | |
| Descripción | AC/DC LED Controller | |
| Fabricantes | Macroblock | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MBI6904 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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Macroblock
Features
Preliminary Datasheet
MBI6904
AC/DC LED Controller
with 4-step Dimming Capability
z Efficiency> 85% when VAC =110V, ILED=100mA, VLED =80V
z PWM switching control
z 4-step dimming capability
z Operation with active power factor correction
z THD < 15% when VAC =110V, ILED=100mA, VLED =80V
z Full protections: OTP/UVLO/OVP/OCP/LED open-/short-circuit
z Current setting accuracy within ±5%
z Full range line regulation within 1.7%
z Available in SOP-8L package
Small Outline Package
GD: SOP8L-150-1.27
Product Description
MBI6904 is a high efficiency buck-boost AC/DC controller designed to deliver constant output current. The input
voltage range of MBI6904 application is universal from 85VAC to 265VAC. It is featured by a PWM control scheme.
MBI6904 is designed to operate with active power factor correction (PFC) circuit and is therefore capable of
maintaining system power factor greater than 0.9 with proper design. MBI6904 regulates the output current within
±5% of the preset current by well controlling the external MOSFET. In addition, MBI6904 can operate with 4-step
dimming. MBI6904 also protects the controller from fault conditions, inclusive of under voltage lock-out (UVLO), over
voltage protection (OVP) and over current protection (OCP). To ensure the system reliability, over temperature
protection (OTP) is built-in to prevent IC from over temperature (155°C) by turning off the external MOSFET. Once
the temperature drops below 125°C, the external MOSFET will resume working. MBI6904 is available in SOP-8L
package.
Applications
z T-8 CFL Replacement LED Solution
z E26/E27 Light Bulb Alternative LED Solution
z Flat Panel Lighting Solution
z General Illuminations
©Macroblock, Inc. 2011
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 - December 2011, V1.00
1 page  
MBI6904
AC/DC LED Controller
with 4-step Dimming Capability
Maximum Ratings
Operation above the maximum ratings may cause device failure. Operation at the extended periods of the maximum
ratings may reduce the device reliability.
Characteristic
Symbol
Rating
Unit
Supply Voltage
VDD -0.4~44
V
Sustaining voltage at VCS pin
VCS 7
V
Sustaining voltage at VFB pin
Power Dissipation
(On 4-Layer PCB, Ta=25°C)
Thermal Resistance
(By simulation, on 4-Layer PCB)*
GD Type
VFB
PD
Rth(j-a)
7
3.13
40
V
W
°C/W
Junction Temperature
Tj,max
150**
°C
Operating Ambient Temperature
Topr -40~+85
°C
Storage Temperature
Tstg -55~+150
°C
*The PCB size is 76.2mm*114.3mm in simulation. Please refer to JEDEC JESD51.
** Operation at the maximum rating for extended periods may reduce the device reliability; therefore, the suggested
junction temperature of the device is under 125°C.
Note: The performance of thermal dissipation is strongly related to the size of thermal pad, thickness and layer
numbers of the PCB. The empirical thermal resistance may be different from simulative value. Users should plan for
expected thermal dissipation performance by selecting package and arranging layout of the PCB to maximize the
capability.
- 5 - December 2011, V1.00
5 Page 
MBI6904
AC/DC LED Controller
with 4-step Dimming Capability
Design Example
The sample design is based on the following specifications.
To light up 22 pieces of high power white LEDs, the forward voltage of each LED is 3.2V. The desired LED current is
100mA, and the input line voltage is 220VAC. Users should calculate the required components. (The LED is chosen
from NICHIA, NS2W123BT)
Output LED Current ( ILED)
The LED current can be set by RFB. RFB = 0.2 / ILED = 0.2 / 100mA = 2Ω. The power dissipation of RFB can be
eliminated, and it is equal to PRFB = 0.2 × 100mA =0.02W. Therefore, a 1%, 2Ω resistor with 125mW power
dissipation is recommended.
Inductor ( L1)
The inductor (L1) can be designed by the follow equation:
L1
=
η ⋅ VI2N,MAX ⋅ D2
4 ⋅ PLED ⋅ fS
where
η is the assumed conversion efficiency,
VIN,MAX is the peak value of input voltage,
D is the duty ratio, PLED is the total output power, and
fS is the switching frequency.
Since the input line voltage is 220VAC, the peak value of the input voltage (VIN,MAX) is 311V. Assume the conversion
efficiency is 80%, the total output power (PLED) is 7W, the switching frequency is 42KHz, and the duty ratio is 18%.
According to the above equation and specifications, the L1 inductance can be calculated, which is equal to 2.13mH.
Also the maximum current (IL1,MAX) of L1 can be estimated by:
IL1,MAX
=
VIN,MAX ⋅ t on
L1
=
VIN,MAX ⋅ D ⋅ TS
L1
where
ton and TS are the switching-on time and switching period, respectively.
To choose a 2mH inductor to be L1, such that IL1,MAX is equal to 0.67A. In this application, the 1A saturation current is
recommended to keep a 50% safety margin.
Inductor Current Sensing Resistor (RCS)
MBI6904 features the cycle-by-cycle inductor current limit through an inductor current sensing resistor (RCS). To set
the over-current-protect level at 1A (IOCP=1A), the RCS can be calculated by:
RCS = 0.2 / IOCP = 0.2 / 1 = 0.2 Ω
In this application, a 1%, 2Ω resistor with 125mW power dissipation is recommended.
- 11 -
December 2011, V1.00
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MBI6904.PDF ] | |
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