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PDF BD8119FM-M Data sheet ( Hoja de datos )
| Número de pieza | BD8119FM-M | |
| Descripción | White Backlight LED Driver | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
White Backlight LED Driver
For Medium to Large LCD Panels
(Switching Regulator Type)
BD8119FM-M
General Description
BD8119FM-M is a white LED driver with the capability
to withstand high input voltage (36V Max).
This driver has 4ch constant-current drivers integrated
in 1-chip. Each channel can draw up to 150mA max for
driving high brightness on LED. A current-mode
buck-boost DC/DC controller is also integrated to
achieve stable operation against unstable car-battery
voltage input. This also removes the constraint of the
number of LEDs in series connection. The brightness
can be controlled by either PWM or VDAC techniques.
Key Specifications
Input Supply Voltage Range:
Standby Current:
LED Maximum Output Current:
Operating Temperature Range:
5.0V to 30V
4µA (Typ)
150mA(Max)
-40°C to +95°C
Package
W(Typ) x D(Typ) x H(Max)
Features
■ Integrated buck-boost current-mode DC/DC
controller
■ Four integrated LED current driver channels
(150mA Max each channel)
■ PWM Light Modulation
(Minimum Pulse Width 25µs)
■ Built-in protection functions
(UVLO, OVP, TSD, OCP, SCP)
■ Abnormal status detection function
(OPEN/ SHORT)
HSOP-M28
18.50mm x 9.90mm x 2.41mm
Applications
Backlight for car navigation, dashboard panels, etc.
〇Product structure : Silicon monolithic integrated circuit
.www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 14 • 001
〇This product has no designed protection against radioactive rays
1/27
TSZ02201-0T3T0C600030-1-2
28.Aug.2014 Rev.001
1 page  
BD8119FM-M
Electrical Characteristics (unless otherwise specified, VCC=12V Ta=25°C)
Parameter
Symbol
Limit
Unit
Min Typ Max
Circuit Current
ICC - 7 14 mA
Conditions
EN=Hi, SYNC=Hi, RT=OPEN
PWM=Low, ISET=OPEN, CIN=10µF
Standby Current
IST - 4 8 µA EN=Low
[VREG Block (VREG)]
Reference Voltage
VREG
4.5 5 5.5 V IREG=-5mA, CREG=2.2µF
[OUTH Block]
OUTH High-side ON-Resistance
OUTH Low-side ON-Resistance
Over-Current Protection
Operating Voltage
[OUTL Block]
RONHH
RONHL
VOLIMIT
1.0 3 4.5 Ω ION=-10mA
0.5 2 3.0 Ω ION=10mA
VCC
VCC
VCC
-0.66 -0.6 -0.54
V
OUTL High-side ON-Resistance
OUTL Low-side ON-Resistance
RONLH 1.0 3 4.5 Ω ION=-10mA
RONLL
0.5 2 3.0 Ω ION=10mA
[SW Block]
SW Low-side ON-Resistance
RON_SW
1.0 2.0 4.0 Ω ION_SW=10mA
[Error Amplifier Block]
LED Voltage
VLED
0.9 1.0 1.1 V
COMP Sink Current
ICOMPSINK
15
25
35 µA VLED=2V, VCOMP=1V
COMP Source Current
ICOMPSOURCE -35 -25 -15 µA VLED=0V, VCOMP=1V
[Oscillator Block]
Oscillating Frequency
fOSC 250 300 350 KHz RRT=100kΩ
[OVP Block]
Over-voltage Detection
Reference Voltage
OVP Hysteresis Width
SCP Latch OFF Delay Time
VOVP
VOHYS
tSCP
1.9 2.0 2.1 V VOVP=Sweep up
0.45
70
0.55
100
0.65
130
V VOVP=Sweep down
ms RRT=100kΩ
[UVLO Block ]
UVLO Voltage
VUVLO
4.0 4.3 4.6 V VCC : Sweep down
UVLO Hysteresis Width
VUHYS
50 150 150 mV VCC : Sweep up
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/27
TSZ02201-0T3T0C600030-1-2
28.Aug.2014 Rev.001
5 Page 
BD8119FM-M
3. Buck-Boost DC/DC Controller
(1) Number of LEDs in Series Connection
Output voltage of the DCDC converter is controlled such that the forward voltage over each of the LEDs on the output
is set to 1.0V (Typ). DCDC operation is performed only when the LED output is operating. When two or more LED
outputs are operating simultaneously, the LED voltage output is held at 1.0V (Typ) per LED from the set of LEDs in
series with the highest VF value. The voltages of other LED outputs are increased only in relation to the fluctuation of
voltage over these LEDs in series. Consideration should be given to the change in power dissipation due to variations
in VF of the LEDs. Please determine the allowable maximum VF variance of the total LEDs in series by using the
description as shown below:
VF variation allowable voltage 3.7V(Typ) = short detecting voltage 4.7V(Typ) - LED control voltage 1.0V(Typ)
The number of LEDs that can be connected in series is limited due to the open-circuit protection circuit, which
engages at 85% of the set OVP voltage. Therefore, the maximum output voltage of the under normal operation
becomes 30.6V 36V 0.85, where 30.6 1.0V/VF Nmaximum numberof LEDs in series .
(2) Over-voltage Protection Circuit (OVP)
The output of the DCDC converter should be connected to the OVP pin using a voltage divider. In determining an
appropriate trigger voltage for OVP function, consider the total number of LEDs in series and the maximum variation
in VF. Also, bear in mind that over-current protection (OCP) is triggered at 0.85 x OVP trigger voltage. If the OVP
function operates, it will not release unless the DCDC voltage drops to 72.5% of the OVP trigger voltage. For
example, if ROVP1 (output voltage side), ROVP2 (GND side), and DCDC voltage VOUT are conditions for OVP, then:
VOUT ROVP1 ROVP2 / ROVP2 2.0V
OVP will operate when VOUT > 32 V if ROVP1 = 330 kΩ and ROVP2 = 22 kΩ.
(3) Buck-boost DC/DC Converter Oscillation Frequency (fOSC)
The regulator’s internal triangular wave oscillation frequency can be set using a resistor connected to the RT pin (pin
26). This resistor determines the charge/discharge current to the internal capacitor, thereby changing the oscillating
frequency. Refer to the following theoretical formula when setting RT:
fOSC
30 106
R RT Ω
α
kHz
30 x 106 (V/A/S) is a constant (±16.6%) determined by the internal circuitry, and α is a correction factor that varies in
relation to RT: {RT: α = 50kΩ: 0.98, 60kΩ: 0.985, 70kΩ: 0.99, 80kΩ: 0.994, 90kΩ: 0.996, 100kΩ: 1.0, 150kΩ: 1.01,
200kΩ: 1.02, 300kΩ: 1.03, 400kΩ: 1.04, 500kΩ: 1.045 }
A resistor in the range of 62.6kΩ to 523kΩ is recommended. Settings that deviate from the frequency range shown
below may cause switching to stop, and proper operation cannot be guaranteed.
550K
450K
350K
250K
150K
50K
0
100 200 300 400 500 600 700 800
RRTT [[kkΩΩ]]
Figure 13. Switching Frequency vs RT
(4) External DC/DC Converter Oscillating Frequency Synchronization (fSYNC)
Do not switch from external to internal oscillation of the DC/DC converter if an external synchronization signal is
present on the SYNC pin. When the signal on the SYNC terminal is switched from high to low, a delay of about 30µs
(Typ) occurs before the internal oscillation circuitry starts to operate (only the rising edge of the input clock signal on
the SYNC terminal is recognized). Moreover, if external input frequency is less than the internal oscillation frequency,
the internal oscillator will operate after the above-mentioned 30µs (Typ) delay; thus, do not input a synchronization
signal with a frequency less than the internal oscillation frequency.
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/27
TSZ02201-0T3T0C600030-1-2
28.Aug.2014 Rev.001
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet BD8119FM-M.PDF ] | |
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