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Overview
ROHM offers 3 new LED drivers for LCD backlights featuring high voltage resistance (36V), making them ideal for automotive systems. A DC/DC converter,
constant current block, and multiple protection circuits are integrated into a single chip, ensuring reliable, high quality LED backlight driving in LCDs of all types..
Lineup |
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- For car navigation panels
BD8113EFV: 7 lamps × 2 rows
(HTSSOP-B24)
BD8118FM: 7 lamps × 4 rows
(HSOP-M28)
- For car LCD panels
BD8109FM: 7 lamps × 4 rows
(HSOP-M28)
(Automotive Specifications)
Features
- High voltage resistance output terminal: 36V
- Current mode step-up/down DC/DC converter (BD8113EFV/BD8109FM)
Step-up DC/DC converter
(BD8118FM)
- Constant current LED driver
2-line parallel (150mA max.): BD8113EFV
4-line parallel (150mA max.):
BD8118FM/BD8109FM
- Compatible with both PWM and linear dimming control
- Multiple protection circuits
(UVLO,OVP,TSD,OCP)
- Open/short protection built in
(BD8118FM: Open protection only)
- ESD resistance (HBM): 8kV (BD8113EFV,BD8109FM)
(BD8118FM: 5kV)
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Feature 1 : Step-up/-down DC/DC converter with REGSPICTM not susceptible to supply voltage fluctuations
| The BD8113EFV and BD8109FM utilize ROHM's proprietary REGSPICTM system for automatic step-up/-down switching based on fluctuations in the supply voltage, resulting in stable performance. In addition, the inductor and capacitor - used in conventional SEPIC systems - are not required, saving both costs and valuable board space, while no input voltage restrictions contribute to greater design flexibility. |
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Feature 2 : PWM operation makes linear dimming from 0.38% duty possible
The BD8113EFV, BD8109FM, and BD8118FM are compatible with both linear and PWM dimming control methods.
The PWM method optimizes step-up voltage startup, maintaining linearity from a duty of 0.38%. This results in superior dimming control with little power loss. |
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Feature 3 : Protection is also provided against LED disconnections
| BD8113EFV and BD8109FM feature high ESD resistance (8kV) and numerous protection circuits, including low voltage malfunction prevention, thermal shutdown, and overcurrent/overvoltage protection. In addition, protection against LED disconnection or short-circuits, as well as current runaway during step-up operation, is included, providing a greater level of safety and reliability. |
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Lineup
| Part No. |
Supply Voltage (V) |
Rectification Method |
No. of LEDs
(In Series) |
Output
Voltage (V) |
Output Current
(mA) |
Switching Frequency
(MHz) |
Primary Brightenss Control Method |
Package
(mm) |
| BD8113EFV |
5.0 to 30 |
External Diode
(Step-up/-down) |
3-7 lamps
× 2 lines
(parallel) |
Max.36 |
Max. 150/line |
0.25 to 0.60 |
Control via PWM signals from the PWM pin/Analog voltage from the VDAC pin |
HTSSOP-B24
(7.8×7.6,H=
1.0Max.) |
| BD8118FM |
4.5 to 30 |
External Diode
(Step-up) |
3-7 lamps
× 4 lines
(parallel) |
Max.36 |
Max. 150/line |
0.25 to 0.55 |
Control via PWM signals from the PWM pin/Analog voltage from the VDAC pin |
HSOP-M28
(18.5×9.9,H=
2.2Max.) |
| BD8109FM |
5.0 to 30 |
External Diode
(Step-up/-down) |
3-7 lamps
× 4 lines
(parallel) |
Max.36 |
Max. 150/line |
0.25 to 0.55 |
Control via PWM signals from the PWM pin/Analog voltage from the VDAC pin |
HSOP-M28
(18.5×9.9,H=
2.2Max.) |
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