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PDF BD6079GWL Data sheet ( Hoja de datos )
| Número de pieza | BD6079GWL | |
| Descripción | White LEDs Driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Datasheet
White LEDs Driver
for up to 2LEDs in series, 5 strings
BD6079GWL
General Description
BD6079GWL is a boost-up DC/DC type white LED driver
IC with synchronous rectification that can drive up to 10
LEDs, arranged in 1-5 strings of 2LEDs in Series, with
string LED Cathodes connected to GND.
With synchronous rectification (no external schottky diode
required) and small package, it is possible to save mount
space.
The brightness of LED can be adjusted by using PWM
pulse on EN pin. (PWM Frequency :100Hz~1600Hz)
LED current is set by resistance at ISET terminal.
Key Specification
Power supply voltage range:
Quiescent Current:
Switching frequency
Operating temperature range
2.3V to 5.5V
0.4µA (Typ.)
2MHz(Typ.)
-30°C to +85°C
Features
Synchronous rectification Boost type DC/DC
converter
No external schottky diode required
1-5 strings of 2 white LEDs in series
Boost function with 1 wire
Brightness adjustment by external PWM pulse
High Efficiency (87.8%(Typ.) at 115mA)
High accuracy & good matching current driver
Rich safety functions
Over-voltage protection
Output short protection
Inductor Over Current Limit
LED open/short protection
Under voltage lockout
Thermal shutdown
Typical Application Circuit
Package
UCSP50L1
W (Typ.) x D (Typ.) x H (Max.)
1.80mm x 1.40mm x 0.50mm
Application
This LED driver IC is applicable for various fields such as
Backlight for mobile phones, portable game machines,
door phones, audio players, portable DVD players, printer,
etc.
Torchlight and easy flash for camera of mobile phone
Portable equipment
Pin Configuration
1
2
3
Battery
4.7µH(Typ.)
A VIN
ISET
D1
2.2µF
(Typ.)
VIN
PWM
EN
Serial control
NB
SW
VOUT
GND
D1
D2
D3
D4
D5
ISET
Rset
10µF
(Typ.)
ILED
B EN NB D2
C GND
D5
D3
D SW
VOUT
D4
Top View
Figure 1. Typical Application Circuit
Product structure Silicon monolithic integrated circuit
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 14 001
This product is not designed protection against radioactive rays.
1/37
TSZ02201-0G3G0C200340-1-2
14.Mar.2013 Rev.001
1 page  
BD6079GWL
Typical Performance curve (VIN= 3.7V, Ta = +25°C, unless otherwise noted.)
Datasheet
0.5
0.4
85°C
0.3
0.2 25°C
0.1
0.0
0
-30°C
1234
VIN [V]
Figure 3. Quiescent Current
5
1.0
0.8
0.6
-
0.4
0.2
25°C
85°C
-30°C
UVLO Detect(falling)
-30°C : 1.967V
25°C : 1.967V
85°C : 1.967V
0.0
0
12345
VIN [V]
Figure 5. Current setting voltage and
UVLO detect function (falling)
1.5
85°C
1.0
25°C
-30°C
0.5
0.0
0
12345
VIN [V]
Figure 4. Device operating current
3.0
2.5
25°C
2.0
85°C
-30°C
1.5
1.0
2.5
3.0 3.5 4.0 4.5 5.0
VIN [V]
Figure 6. Switching frequency
5.5
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
5/37
TSZ02201-0G3G0C200340-1-2
14.Mar.2013 Rev.001
5 Page 
BD6079GWL
Datasheet
<Case3: Startup with PWM dimming at PWM frequency=1.6kHz >
BD6079GWL’s DC/DC starts up and boosts up 7.5V (Typ.) within 1.2ms (Typ.) at first EN signal coming.
DC/DC will turn on regardless of ‘H’ time of EN.
If the next EN rising edge is coming during “soft start” 1.2ms (Typ.), BD6079GWL will go to the normal boost mode and
LEDs will turn on after “soft start”. At the first driver start-up, LED driver checks LED’s setting (open or short). If LED is
detected to be open or short, driver will cut off current until shutdown mode. If EN signal is not asserted again and 33ms
(Typ.) have elapsed after final falling edge, LED driver goes to shutdown mode. (Figure 24, Figure 25)
Turn on(NB=L, PWM=1.6kHz, duty=95%)
1.6kHz(625μs)
Duty=95%
EN terminal
HL
NB terminal
REFEN
(Internal enable signal)
L
Initial boost
Soft start(1.2ms(Typ.))
7.5V(Typ.)
33ms(Typ.)
H
L
Shutdown
VOUT terminal
LED current
Figure 24. Turn ON (NB=L, PWM Frequency=1.6kHz, duty=95%)
Turn on(NB=L, PWM=1.6kHz, duty=0.8%(H=5μs))
1.6kHz(625μs)
EN terminal
Duty=0.8% (H=5μs)
L
NB terminal
REFEN
(Internal enable signal)
L
Initial boost
Soft start(1.2ms(Typ.))
7.5V(Typ.)
33ms(Typ.)
L
Shutdown
VOUT terminal
LED current
Figure 25. Turn ON (NB=L, PWM Frequency=1.6kHz, duty=0.8%(H=5μs))
<Case4: Startup with Boost mode at PWM duty 100%>
NB terminal is set for current setting (Boost mode: 25mA to 28mA).
BD6079GWL’s DC/DC starts up and boosts up 7.5V (Typ.) within 1.2ms (Typ.) at first EN signal coming.
After 11ms (Typ.), go to normal boost mode and LEDs turn on. At the first driver start-up, LED driver checks LED’s setting
(open or short). If LED is detected to be open or short, driver will cut off current until shutdown mode. If EN signal is not
asserted again and 33ms (Typ.) have elapsed after final falling edge, LED driver goes to shutdown mode. (Figure 26)
Turn on(NB=H, PWM duty = 100%)
11ms(Typ.)
33ms(Typ.)
EN terminal
H
NB terminal
27mA setting
H
REFEN
Initial boost
(Internal enable signal)
Soft start(1.2ms(Typ.))
7.5V(Typ.)
H
VOUT terminal
LED current
Figure 26. Turn ON (NB=H, PWM duty=100%)
Shutdown
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
11/37
TSZ02201-0G3G0C200340-1-2
14.Mar.2013 Rev.001
11 Page | ||
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| PDF Descargar | [ Datasheet BD6079GWL.PDF ] | |
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