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PDF BD1754HFN Data sheet ( Hoja de datos )

Número de pieza BD1754HFN
Descripción Constant Current LED Driver
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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No Preview Available ! BD1754HFN Hoja de datos, Descripción, Manual

Datasheet
Constant Current LED Driver
with 64 Dimming Steps for up to 4 LEDs
BD1754HFN
General Description
BD1754HFN is a multi-level brightness control LED
Driver that works as a constant current driver with 64
steps, so that the driving current can be adjusted finely.
BD1754HFN is best suited to turn ON LEDs that require
high-accuracy LED brightness control.
Features
Current Regulation for up to 4 Parallel LEDs
Adjustable Constant Current with 64 Steps
High Accuracy and Good Matching of each Current
Channel (0.5% Typ)
Brightness Control Via Single-Line Digital Control
Interface (Uni-Port Interface Control = UPIC)
Key Specification
Operating Power Supply Voltage Range:
2.7V to 5.5V
Quiescent Current:
0.1μA (Typ)
Operating Temperature Range: -30°C to +85 °C
Package
W(Typ) x D(Typ) x H(Max)
Applications
This driver can be used in various applications such as
mobile phones, portable game consoles and etc.
HSON8
2.90mm x 3.00mm x 0.60mm
Typical Application Circuit
Power Supply
IN
CIN 0.1µF
EN
L1 L2 L3 L4
BD1754HFN
GND
ISET
RISET 120kΩ
(When ILED-max =32mA)
Product structureSilicon monolithic integrated circuit
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product has no designed protection against radioactive rays
1/17
TSZ02201-0G3G0C200060-1-2
10.Dec.2015 Rev.002

1 page




BD1754HFN pdf
BD1754HFN
Typical Performance Curves - continued
Datasheet
Ta= -30, 25, 85 °C
Ta= -30, 25, 85 °C
Operating Power Supply Voltage: VIN [V]
Figure 5. LED Output Current vs Operating Power Supply Voltage
(VIN = 3.6 V, at 32 mA of LED Current)
Code [dec]
Figure 6. LED Current Characteristics
(VIN = 3.6 V, Differential Linearity Error)
Ta= -30, 25, 85 °C
Code [dec]
Figure 7. LED Current Characteristics
(VIN = 3.6 V, Integral Linearity Error)
Ta= -30°C
Ta= 85°C
Ta= 25°C
Current State
Figure 8. LED Current Relative Accuracy
(VIN= 3.6 V)
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
5/17
TSZ02201-0G3G0C200060-1-2
10.Dec.2015 Rev.002

5 Page





BD1754HFN arduino
BD1754HFN
(5) Circuit example when driving a large current with only one LED powered ON.
Datasheet
ILED=128mA
L1 L2 L3 L4
IN
CIN 0.1µF
EN
UPIC
6
Current
DAC
GND
ISET
RISET 120kΩ
(W hen
ILED-max=32mA)
Figure 17. Circuit Example when Driving a Large Current with only one LED Powered ON.
This figure shows a circuit example when driving a large current through all of four channels with only one LED
powered ON. By shorting out all the LED driver pins, in the example of using 120 kΩ RISET, a current up to 128 mA (32
mA x 4) can be driven. In this example, the brightness can be adjusted in 64 gradations with 2 mA step (0.5 mA
step/channel x 4 channels). For higher current values, using 60 kΩ RISET allows a current up to 256 mA to be driven
into one of the LEDs. The power ON/OFF and the brightness of the LEDs are controlled through the EN pin in
accordance with the UPIC format.
(6) Circuit example when making the eight LEDs available by connecting the two BD1754HFN drivers
L1 L2 L3 L4
IN
CIN 0.1µF
EN
UPIC
6
Current
DAC
GND
ILED=32mA
L1 L2 L3 L4
IN
CIN 0.1µF
EN
UPIC
ISET
RISET
120kΩ
(W hen
ILED-max=32mA)
6
Current
DAC
GND
ILED=32mA
ISET
RISET
120kΩ
(W hen
ILED-max=32mA)
Figure 18. Circuit Example when Making the Eight LEDs Available by Connecting the Two BD1754HFN Drivers
This figure shows a circuit example when making eight LEDs available by connecting two BD1754HFN drivers.
By connecting the control signals to the EN pins in parallel, the eight LED channels can be controlled concurrently.
This parallel connection scheme can increase the number of the LED channels further as necessary (such as twelve,
sixteen, or more). Determine the resistance value with which the LED current value is maximized and then connect
such resistor between the ISET and the GND pins. The power ON/OFF and the brightness of the LEDs are controlled
through the EN pin in accordance with the UPIC format.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
11/17
TSZ02201-0G3G0C200060-1-2
10.Dec.2015 Rev.002

11 Page







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