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PDF MBI6804 Data sheet ( Hoja de datos )
| Número de pieza | MBI6804 | |
| Descripción | Two Step Dimmable Isolated AC/DC LED Driver | |
| Fabricantes | Macroblock | |
| Logotipo |  |
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Macroblock
Preliminary Datasheet
MBI6804
Two Step Dimmable Isolated AC/DC LED Driver
Features
Constant current LED driver
Primary side regulation without photocoupler
Built-in active power factor correction
Quasi-resonant switching
Universal input voltage range
Support up to 50W output
Full protections: Thermal shutdown
VDD over voltage (OVP)
Under voltage lock-out (UVLO)
LED open-/short- circuit
Current sensing resistor open/short-circuit
Compensating capacitor open/short-circuit
Available in SOP-8 package
2 steps dimmable by input voltage toggling
High 2nd step output current accuracy
Package MSL Level : 3
Product Description
MBI6804 is a universal input AC-DC converter designed to deliver constant current with primary side regulation
(PSR) control. The built-in active power factor correction circuit maintains high power factor over a wide input
voltage range. MBI6804 is optimized for applications of output power up to 50 Watt, and the efficiency is enhanced
with quasi-resonant switching technique. MBI6804 is also featured with under voltage lock-out (UVLO), over
temperature protection (OTP), LED open-circuit protection and LED short-circuit protection to protect the converter
from being damaged accidentally. MBI6804 is specifically designed with current sensing resistor short protection to
prevent MOSFET over-current and transformer saturation caused by manufacturing defect such as solder splash or
abnormal operation such as accidental short-circuit by earthquake.
Applications
T8 light tube LED alternative solutions
E26/E27 light bulb LED alternative solutions
PAR light LED alternative solutions
External LED power supply
©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-
July 2015, V3.00
1 page  
MBI6804
Two Step Dimmable Isolated AC/DC LED Driver
Electrical Characteristics
Test condition: VDD=18V, CIN=10μF, and TA=25°C unless otherwise specified.
Characteristics
Symbol Conditions Min
Supply Voltage
Continuous operating voltage
Start-up voltage
Under-voltage lockout
VDD over-voltage protection
Operating current
Stand-by current
VOP
VSTART_UP
VUVLO
VDD-OVP
IDD-OP
IDD-ST
-
Start-up
UVLO
-
VDD=18V,CL=1nF,
FSW=20kHz
VDD=18V,CL=1nF,
FSW=120kHz
IDD before start-up
-
-
-
18
-
-
-
Error Amplifier
Reference Voltage
COMP Pre-charge Voltage
COMP Clamping Voltage
Maximum COMP Charging Current
VREF
∆VPC
VCLAMP
ICOMP
-
At first start up
-
-
1.176
-
-
-
Current Sense
Current Limit Threshold Voltage
VCL -
0.9
Voltage Sense
VS Pin Sourcing Current
ISource_VS
VS=-0.3V
--
Gate Driver
Output high voltage
Output low voltage
Rising time
Falling time
Maximum On-time
Minimum On-time
Maximum Off-time
Maximum Switching Frequency
VOH
VOL
TR
TF
TON_Max
TON_min
TOFF_Max
FSwitch_Max
VDD=20V
at operating
VDD=20V
at operating
VDD=20V,
20%-80% of swing
VDD=20V,
20%-80% of swing
COMP=3.8V
CS=1.5V
-
-
-
-
-
-
-
-
-
105
Thermal Shutdown
Thermal shutdown threshold
TSD Hysteresis=30℃ 140
Dimming
Dimming Step Number
--
-
Dimming Block Current
--
-
Dimming Block Hold Time
Dimming Block Operating Voltage
- CDIM≦10uF
--
1
-
Dimming Reset Voltage
--
-
Rdim Output Current
--
-
Typ
14
17
7
20
1.2
2.5
20
1.2
1.25
4
65
1
0.8
12
-
35
25
14
200
50
120
155
2
6
-
4.5
2.2
105
Max Unit
-V
-V
-V
22 V
2 mA
5 mA
30 uA
1.224
-
-
-
V
V
V
uA
1.1 V
- mA
-V
0.5 V
70 ns
60 ns
- us
- ns
- us
135 kHz
170 °C
- time
10 uA
-S
-V
-V
- uA
July 2015, V3.00
-5-
5 Page 
MBI6804
Two Step Dimmable Isolated AC/DC LED Driver
specification of zener diode, 1SMA4749, from Panjit could be the reference of clamp circuit.
Normal
operation
Vo_open
Vo
Output opened
Normal
operation
GATE
VDD
VDD_OVP
VUVLO
Vs
Fig.9 Conceptual waveform of VO, GATE, VDD and VS when output is opened and recovered
LED Short-Circuit Protection
The operation of LED short-circuit protection is illustrated in Fig.10 By detecting whether the voltage at pin VS
drops to zero while the voltage at pin CS exceeds 1.0V, MBI6804 can judge the occurrence of LED short-circuit
failure. Once LED short-circuit failure occurs, GATE signal ceases switching and VDD drops with the output voltage.
The converter is fully turned off when VDD drop below VUVLO and the converter automatically restarts. After the
system restarts, MBI6804 will shut down the converter again if the short-circuit condition still exists or resume
normal operation once the short-circuit condition is removed
Normal
operation
Io
VS
0V
VCS
VCL
Output shorted
Normal
operation
VDD VDD_ON
VUVLO
GATE
Fig. 10 LED short-circuit protection
- 11 -
July 2015, V3.00
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MBI6804.PDF ] | |
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