BW9910/A High Brightness LED Driver
Features
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
85V
AC
up to 265V
AC
. 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 R
DS(ON)
(drain-source on resistance) at
higher V
GS
. The BW9910/BW9910A is available in SOP-8
and SO8-EP packages.
Efficiency > 90%
Universal rectified 85V
AC
to 265V
AC
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
Typical Application Circuit
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BW9910/A High Brightness LED Driver
Pin Assignments and Ordering Information
Device
BW9910 MST
BW9910 MPT
BW9910A MST
BW9910A MPT
V
CS
Tolerance
±10%
±10%
±10%
±10%
Packaging
SOP-8
SO8-EP
SOP-8
SO8-EP
Quantity of Tape & Reel
3000
3000
3000
3000
Pin Descriptions
SOP-8
1
2
3
4
SO8-EP
1
2
3
4
Pin Name
V
IN
CS
GND
GATE
Input voltage pin.
DC input supply voltage.
Current sensing input pin.
Senses LED string current.
Ground pin.
Device ground.
Gate driver output pin.
Drives the gate of the external MOSFET.
PWM dimming input pin.
5
5
PWM_D
Low frequency PWM dimming pin, also enable input. Internal 200kΩ pull-down
resistor to GND.
Internal/External supply voltage pin.
6
6
V
DD
Internally regulated supply voltage. 7.5V nominal for the BW9910 and 10V
nominal for the BW9910A. This pin can supply up to 1.0mA for external circuitry. A
sufficient storage capacitor is used to provide storage when the rectified AC input
is near the zero crossings.
Linear dimming input pin.
7
7
LD
Linear dimming by changing the current limit threshold at current sensing
comparator.
Oscillator control pin.
A resistor connected between this pin and GND sets the PWM frequency.
Exposed pad.
Package bottom. Connect to GND directly underneath the package.
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Function
8
N/A
8
EP
R
OSC
EP Pad
© 2012 Bruckewell Technology Corp., Ltd.
BW9910/A High Brightness LED Driver
Absolute Maximum Ratings
(Note 1)
Symbol
V
INDC
V
CS
V
LD
V
PWM_D
V
GATE
Parametar
DC input supply voltage range, V
IN
to GND
CS input pin voltage range relative to GND
LD input pin voltage range relative to GND
PWM_D input pin voltage range relative to GND
GATE output pin voltage range relative to GND
Continuous power dissipation (T
A
+25°C)
8 Pin SO (de-rating 6.3mW/°C above +25°C)
8 Pin SO-EP (de-rating 16mW/°C above +25°C)
T
J
T
STG
θ
JA
θ
JA(EP)
Note :
1. Exceeding these ratings could cause damage to the device. All voltages are with respect to ground. Currents are positive into,
negative out of the specified terminal.
Ratings
-0.5 ~ +520
-0.3 ~ +0.45
-0.3 ~ +(V
DD
+ 0.3)
-0.3 ~ +(V
DD
+ 0.3)
-0.3 ~ +(V
DD
+ 0.3)
0.63
1.6
+150
-65 ~ +150
165
60
Unit
V
V
V
V
V
W
W
°C
°C
°C/W
°C/W
Junction temperature
Storage temperature range
Junction-to-ambient thermal resistance for SOP-8
Junction-to-ambient thermal resistance for SO8-EP
Recommended Operating Conditions
Symbol
V
INDC
V
EN(LO)
V
EN(HI)
T
A
T
A(EP)
Note :
2. Maximum ambient temperature range is limited by allowable power dissipation. The exposed pad SO8-EP with its lower thermal
impedance allows the variants using this package to extend the allowable maximum ambient temperature range.
Parametar
DC input supply voltage range, V
IN
to GND
PWM_D input pin low voltage range relative to GND
PWM_D input pin high voltage range relative to GND
Ambient temperature range for SOP-8 package
(Note 2)
(Note 2)
Min.
BW9910
BW9910A
15
20
0
2.4
BW9910 MST
BW9910 MPT
-40
-40
Max.
500
500
1.0
V
DD
+85
+105
Unit
V
V
V
°C
°C
Ambient temperature range for SO8-EP package
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BW9910/A High Brightness LED Driver
Electrical Characteristics
(Over recommended operating conditions unless otherwise specified. T
A
+25°C)
Parameter
Input DC supply voltage range
Shut down mode supply
current
Internally regulated voltage
V
DD
current available for
(Note 4)
external circuitry
V
DD
under voltage lockout
threshold
V
DD
under voltage lockout
hysteresis
PWM_D pull-down resistance
Current sensing pull in
threshold voltage
GATE high output voltage
GATE low output voltage
Oscillator frequency
Maximum oscillator PWM duty
cycle
Linear dimming pin voltage
range
Current sensing blanking
interval
Delay from CS trip to GATE
low
GATE output rise time
GATE output fall time
Thermal shut down
Thermal shut down hysteresis
Symbol
V
INDC
Min.
15
20
0.5
0.65
7.0
9.5
7.5
10.0
Typ.
Max.
500
500
1.0
1.20
8.0
11.0
1.0
6.4
8.4
6.7
9.0
500
650
150
225
V
DD
- 0.3
0
20
80
26
100
200
250
250
275
V
DD
0.3
32
120
100
0
160
250
250
440
300
30
30
150
50
50
50
7.0
9.6
Unit
BW9910
V
BW9910A
BW9910
DC input voltage
Condition
I
INSD
mA
Pin PWM_D to GND,
(Note 3)
BW9910A V
IN
V
INDC(MIN)
V
IN
V
INDC(MIN)
~ 500V
(Note 3)
, l
DD(EXT)
0, GATE
BW9910A pin open
BW9910
BW9910
BW9910A
BW9910
BW9910A
BW9910
BW9910A
V
PWM_D
5V
Full ambient temperature range
(Note 5)
V
DD
V
I
DD(EXT)
V
UVLO
∆V
UVLO
R
PWM_D
V
CS
V
GATE(HI)
V
GATE(LO)
f
OSC1
f
OSC2
D
MAX(HF)
V
LD
t
BLANK
t
DELAY
t
RISE
t
FALL
T
SD
∆T
SD
mA
V
mV
kΩ
mV
V
V
kHz
%
mV
ns
ns
ns
ns
°C
°C
V
IN
V
INDC(MIN)
~ 100V
(Note 3)
V
DD
rising
V
DD
falling
I
OUT
10mA
I
OUT
-10mA
R
OSC
1MΩ
R
OSC
226kΩ
f
PWM(HF)
25kHz, at GATE, CS tie to
GND.
Full ambient temperature range
(Note 5)
, V
IN
20V
V
CS
0.5V
V
IN
20V, V
LD
0.15V, V
CS
0V ~
0.22V after t
BLANK
C
GATE
500pF
C
GATE
500pF
Note :
3. V
INDC(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.
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BW9910/A High Brightness LED Driver
Functional Block Diagram
© 2012 Bruckewell Technology Corp., Ltd.
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