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BW9910 데이터시트 PDF




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부품번호 BW9910 기능
기능 High Brightness LED Driver
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BW9910 데이터시트, 핀배열, 회로
BW9910/A High Brightness LED Driver
Features
Efficiency > 90%
Universal rectified 85VAC to 265VAC input range
Constant current LED driver
Applications from a few mA to more than 1.0A
LED string from one to hundreds of diodes
PWM low-frequency dimming via PWM_D pin
Input voltage surge ratings up to 500V
Internal over temperature protection (OTP)
7.5V MOSFET drive – BW9910
10V MOSFET drive – BW9910A
Typical Applications
AC/DC or DC/DC LED Driver applications
RGB backlighting LED Driver
Backlighting of flat panel displays
General purpose constant current source
Signage and decorative LED lighting
Buck/Buck-Boost/Boost LED driver
T8/T9/T10 LED tubes
E26/E27 LED bulbs
Product Description
The BW9910/BW9910A is a PWM high-efficiency LED
driver control IC. It allows efficient operation of high
brightness (HB) LEDs from voltage sources ranging from
85VAC up to 265VAC. The BW9910/BW9910A controls an
external MOSFET at fixed switching frequency up to
300kHz. The frequency can be programmed using a single
resistor. The LED string is driven at constant current rather
than constant voltage, thus providing constant light output
and enhanced reliability. The output current can be
programmed between a few mA and up to more than 1.0A.
The BW9910/BW9910A uses a rugged high voltage
junction isolated process that can withstand an input
voltage surge of up to 500V. Output current to an LED
string can be programmed to any value between zero and
its maximum value by applying an external control voltage
at the linear dimming control input of the
BW9910/BW9910A. The BW9910/BW9910A provides a
low-frequency PWM dimming input that can accept an
external control signal with a duty ratio of 0%~100% and a
frequency of up to a few kHz.
The BW9910A allows wider range of external MOSFET
which has lower RDS(ON) (drain-source on resistance) at
higher VGS. The BW9910/BW9910A is available in SOP-8
and SO8-EP packages.
Typical Application Circuit
© 2012 Bruckewell Technology Corp., Ltd.
1
www.bruckewell-semi.com/
http://www.Datasheet4U.com




BW9910 pdf, 반도체, 판매, 대치품
BW9910/A High Brightness LED Driver
Electrical Characteristics
(Over recommended operating conditions unless otherwise specified. TA +25°C)
Parameter
Symbol Min.
Typ.
Max. Unit
Condition
Input DC supply voltage range VINDC
15
20
500 BW9910
V DC input voltage
500 BW9910A
Shut down mode supply
current
IINSD
0.5
0.65
1.0
1.20
mA
BW9910 Pin PWM_D to GND,
BW9910A VIN VINDC(MIN) (Note 3)
Internally regulated voltage
7.0 7.5 8.0
BW9910 VIN VINDC(MIN) ~ 500V
VDD
V (Note 3), lDD(EXT) 0, GATE
9.5 10.0 11.0
BW9910A pin open
VDD current available for
external circuitry (Note 4)
IDD(EXT)
1.0
mA
BW9910 VIN VINDC(MIN) ~ 100V
BW9910A (Note 3)
VDD under voltage lockout
threshold
6.4 6.7 7.0
BW9910
VUVLO
8.4
9.0
9.6 V BW9910A VDD rising
VDD under voltage lockout
hysteresis
VUVLO
500
650
BW9910
mV BW9910A VDD falling
PWM_D pull-down resistance RPWM_D
150
200
250 kΩ VPWM_D 5V
Current sensing pull in
threshold voltage
VCS
225
250
275
mV
Full ambient temperature range
(Note 5)
GATE high output voltage
VGATE(HI) VDD - 0.3
VDD V IOUT 10mA
GATE low output voltage
VGATE(LO)
0
0.3 V IOUT -10mA
Oscillator frequency
Maximum oscillator PWM duty
cycle
fOSC1
fOSC2
DMAX(HF)
20
80
26 32 kHz ROSC 1MΩ
100 120
ROSC 226kΩ
100
%
fPWM(HF) 25kHz, at GATE, CS tie to
GND.
Linear dimming pin voltage
range
VLD
0
250
mV
Full ambient temperature range
(Note 5), VIN 20V
Current sensing blanking
interval
tBLANK
160
250
440 ns VCS 0.5V
Delay from CS trip to GATE
low
GATE output rise time
tDELAY
tRISE
300
ns
VIN 20V, VLD 0.15V, VCS 0V ~
0.22V after tBLANK
30 50 ns CGATE 500pF
GATE output fall time
tFALL
30 50 ns CGATE 500pF
Thermal shut down
TSD
150 °C
Thermal shut down hysteresis TSD
50 °C
Note :
3. VINDC(MIN) for the BW9910 is 15V and for the BW9910A it is 20V.
4. Also limited by package power dissipation limit, whichever is lower.
5. Full ambient temperature range for BW9910 MST and BW9910A MST is -40 to +85°C; for BW9910 MPT and BW9910A MPT is -
40 to +105°C.
© 2012 Bruckewell Technology Corp., Ltd.
4
www.bruckewell-semi.com/

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BW9910 전자부품, 판매, 대치품
BW9910/A High Brightness LED Driver
(so-called PWM dimming) controls the LED brightness by
varying the duty ratio of the output current.
The linear dimming can be implemented by applying a
control voltage from 0 to 250mV to the LD pin. This
control voltage overrides the internally set 250mV
threshold level of the CS pin and programs the output
current accordingly. For example, a potentiometer
connected between VDD and ground can program the
control voltage at the CS pin. Applying a control voltage
higher than 250mV will not change the output current
setting. When higher current is desired, select a smaller
sensing resistor.
The PWM dimming scheme can be implemented by
applying an external PWM signal to the PWM_D pin. The
PWM signal can be generated by a microcontroller or a
pulse generator with a duty cycle proportional to the
amount of desired light output. This signal enables and
disables the converter modulating the LED current in the
PWM fashion. In this mode, LED current can be in one of
the two states: zero or the nominal current set by the
current sense resistor. It is not possible to use this
method to achieve average brightness levels higher than
the one set by the current sense threshold level of the
BW9910/BW9910A. By using the PWM control method of
the BW9910/BW9910A, the light output can be adjusted
between zero and 100%. The accuracy of the PWM
dimming method is limited only by the minimum gate
pulse width, which is a fraction of a percentage of the low
frequency duty cycle. PWM dimming of the LED light can
be achieved by turning on and off the converter with low
frequency 50Hz to 1kHz TTL logic level signal.
Programming Operating Frequency
The operating frequency of the oscillator is programmed
between 25kHz and 300kHz using an external resistor
connected to the ROSC pin.
Equation :
Power Factor Correction
When the input power to the LED driver does not
exceed 25W, a simple passive power factor correction
circuit can be added to the BW9910/BW9910A typical
application circuit in Figure 2 in order to pass the AC line
harmonic limits of the EN61000-3-2 standard for class C
equipment. The typical application circuit diagram shows
how this can be done without affecting the rest of the
circuit significantly. A simple circuit consisting of 3
diodes and 2 capacitors is added across the rectified AC
line input to improve the line current harmonic distortion
and to achieve a power factor greater than 0.85.
Inductor Design
The buck circuit is usually selected and it has two
operation modes: continuous and discontinuous
conduction modes. A buck power stage can be designed
to operate in continuous mode for load current above a
certain level usually 15% to 30% of full load. Usually, the
input voltage range, the output voltage and load current
are defined by the power stage specification. This
leaves the inductor value as the only design parameter
to maintain continuous conduction mode. The minimum
value of inductor to maintain continuous conduction
mode can be determined by the following example.
Referring to the typical buck application circuit in Figure
5, the value can be calculated from the desired peak-to-
peak LED ripple current in the inductor. Typically, such
ripple current is selected to be 30% of the nominal LED
current. In the example given here, the nominal current
ILED is 350mA. The next step is to determine the total
voltage drop across the LED string. For example, when
the string consists of 10 high brightness LEDs and each
diode has a forward voltage drop of 3.3V at its nominal
current, i.e. the total LED voltage drop VLEDS is 33V.
Equation :
(2)
(1)
where fOSC unit is kHz. ROSC unit is in kΩ and shall be
820kΩ ~ 1MΩ for the case of VOUT < 7V because it has to
satisfy the condition of tON > tBLANK. The efficiency can be
improved as well.
© 2012 Bruckewell Technology Corp., Ltd.
7
where ILED unit is Ampere.
(3)
(4)
(5)
www.bruckewell-semi.com/

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