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BD9409F PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BD9409F
기능 White LED Driver
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BD9409F 데이터시트, 핀배열, 회로
Datasheet
LED Drivers for LCD Backlights
1ch Boost up type
White LED Driver for large LCD
BD9409F
1.1 General Description
BD9409F is a high efficiency driver for white LEDs and is
designed for large LCDs. BD9409F has a boost DCDC
converter that employs an array of LEDs as the light
source.
BD9409F has some protect functions against fault
conditions, such as over-voltage protection (OVP), over
current limit protection of DCDC (OCP), LED OCP
protection, and Over boost protection (FBMAX).
Therefore it is available for the fail-safe design over a
wide range output voltage.
Key Specifications
Operating power supply voltage range:
11.5V to 35.0V
Oscillator frequency of DCDC: 150kHz (RT=100kΩ)
Operating Current:
2.8 mA(Typ.)
Operating temperature range:
-40°C to +105°C
1.2 Package(s)
SOP16
W(Typ) x D(Typ) x H(Max)
10.00mm x 6.20mm x 1.71mm
Pin pitch 1.27mm
Features
DCDC converter with current mode
LED protection circuit (Over boost protection(FB_H),
LED OCP protection)
Over-voltage protection (OVP) for the output voltage
Vout
Adjustable soft start
Adjustable oscillation frequency of DCDC
UVLO detection for the input voltage of the power
stage
PWM Dimming and MS Dimming.
Applications
TV, Computer Display, LCD Backlighting
Figure 1. SOP16
Typical Application Circuit
VCC
VIN
Vout
VCC UVLO OVP
REG90
STB GATE
RT CS
SS
FAIL
DIMOUT
PWM
MS
ISENSE
FB
GND
Rs
Figure 2. Typical Application Circuit
Product structureSilicon monolithic integrated circuit
.www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product has not designed protection against radioactive rays
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TSZ02201-0T2T0C100230-1-2
01.Nov.2016 Rev.001




BD9409F pdf, 반도체, 판매, 대치품
BD9409F
1.6 Absolute Maximum Ratings (Ta=25°C)
Parameter
Power Supply Voltage
SS, RT, ISENSE, FB, CS
Pin Voltage
REG90, DIMOUT, GATE
Pin Voltage
OVP, UVLO, PWM, MS, STB
Pin Voltage
FAIL Pin Voltage
Symbol
VCC
SS, RT, ISENSE, FB, CS
REG90, DIMOUT, GATE
OVP, UVLO, PWM, MS,
STB
FAIL
Rating
-0.3 to +36
-0.3 to +7
-0.3 to +13
-0.3 to +20
-0.3 ~ VCC+0.3
Unit
V
V
V
V
V
Power Dissipation
Pd
0.74 (*1)
W
Operating Temperature Range
Topr
-40 to +105
°C
Junction Temperature
Tjmax
150 °C
Storage Temperature Range
Tstg
-55 to +150
°C
(*1) Derate by 5.92mW/°C when operating above Ta=25°C.. (Mounted on 1-layer 114.3mm x 76.2mm x 1.57mm board)
1.7 Recommended Operating Ranges
Parameter
Power Supply Voltage
DC/DC Oscillation Frequency
PWM Input Frequency
Symbol
VCC
fsw
FPWM
Range
11.5 to 35.0
50 to 1000
90 to 2000
Unit
V
kHz
Hz
1.8 Electrical Characteristics 1/2 (Unless otherwise specified VCC=24V Ta=25°C)
Parameter
Symbol
Min Typ Max Unit
Total Current Consumption
Circuit Current
Icc - 2.8 5.6 mA
Circuit Current (standby)
IST - 60 120 μA
Circuit Current (MS standby) IST_MS - 60 120 μA
UVLO Block
Operation VoltageVCC
VUVLO_VCC 9.5
10.5 11.5 V
Hysteresis VoltageVCC
VUHYS_VCC 130 270 540 mV
UVLO Release Voltage
VUVLO
2.88 3.00 3.12 V
UVLO Hysteresis Voltage
VUHYS
250 300 350 mV
UVLO Pin Leak Current
UVLO_LK
-2
0
2 μA
DC/DC Block
ISENSE Threshold Voltage 1
VLED1
0.327 0.341 0.355 V
ISENSE Threshold Voltage 2
VLED2
0.441 0.455 0.470 V
ISENSE Threshold Voltage 3
VLED3
0.483 0.500 0.518 V
MS Threshold Voltage 0
VMS0
-0.25 0.00 0.25 V
MS Threshold Voltage 1
VMS1
0.70 1.00 1.25 V
MS Threshold Voltage 2
VMS2
1.70 2.00 2.25 V
MS Threshold Voltage 3
VMS3
2.70 3.00 10.0 V
Oscillation Frequency
RT Short Protection Range
RT Terminal Voltage
FCT
RT_DET
VRT
142.5
-0.3
1.6
150
-
2.0
157.5
VRT
×90%
2.4
kHz
V
V
GATE Pin MAX DUTY Output
GATE Pin ON Resistance
(as source)
GATE Pin ON Resistance
(as sink)
SS Pin Source Current
MAX_DUTY
RONSO
RONSI
ISSSO
90
2.5
2.0
-3.75
95
5.0
4.0
-3.00
99
10.0
8.0
-2.25
%
Ω
Ω
μA
SS Pin ON Resistance at OFF
RSS_L
- 3.0 5.0 kΩ
Soft Start Ended Voltage
VSS_END 3.52 3.70 3.88 V
Conditions
VSTB=3.0V, PWM=3.0V
VSTB=0V
VSTB=3.0V, MS=0V
VCC=SWEEP UP
VCC=SWEEP DOWN
VUVLO=SWEEP UP
VUVLO=SWEEP DOWN
VUVLO=4.0V
MS=1V(75% dimming)
MS=2V(100% dimming)
MS=3V(110% dimming)
VSTB=3.0V, PWM=3.0V
VSTB=3.0V, PWM=3.0V
VSTB=3.0V, PWM=3.0V
VSTB=3.0V, PWM=3.0V
RT=100kΩ
RT=SWEEP DOWN
RT=100kΩ
RT=100kΩ
VSS=2.0V
SS=SWEEP UP
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
4/33
TSZ02201-0T2T0C100230-1-2
01.Nov.2016 Rev.001

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BD9409F 전자부품, 판매, 대치품
BD9409F
2.1 Pin Descriptions
Pin 1: VCC
This is the power supply pin of the IC. Input range is from 11.5V to 35V.
The operation starts at more than 10.5V(typ.) and shuts down at less than 10.2V(typ.).
Pin 2: STB
This is the ON/OFF setting terminal of the IC. Input reset-signal to this terminal to reset IC from latch-off.
At startup, internal bias starts at high level, and then PWM DCDC boost starts after PWM rise edge inputs.
Note: IC status (IC ON/OFF) transits depending on the voltage inputted to STB and MS terminal. Avoid the use of
intermediate level (from 0.8V to 2.0V).
Pin 3: OVP
The OVP terminal is the input for over-voltage protection. If OVP is more than 3.0V(typ), the over-voltage protection
(OVP) will work. At the moment of these detections, it sets GATE=L, DIMOUT=L and starts to count up the abnormal
interval. If OVP detection continued to count four GATE clocks, IC reaches latch off. (Please refer to 3.5.5 Timing Chart)
The OVP pin is high impedance, because the internal resistance is not connected to a certain bias.
Even if OVP function is not used, pin bias is still required because the open connection of this pin is not a fixed potential.
The setting example is separately described in the section 3.2.6 OVP Setting”.
Pin 4: UVLO
Under Voltage Lock Out pin is the input voltage of the power stage. , IC starts the boost operation if UVLO is more than
3.0V(typ) and stops if lower than 2.7V(typ).
The UVLO pin is high impedance, because the internal resistance is not connected to a certain bias.
Even if UVLO function is not used, pin bias is still required because the open connection of this pin is not a fixed
potential.
The setting example is separately described in the section ”3.2.5 UVLO Setting
Pin 5: SS
This is the pin which sets the soft start interval of DC/DC converter. It performs the constant current charge of 3.0 μA(typ.)
to external capacitance Css. The switching duty of GATE output will be limited during 0V to 3.7V(typ.) of the SS voltage.
So the soft start interval Tss can be expressed as follows
TSS 1.23106 CSS[sec]  Css: the external capacitance of the SS pin.
The logic of SS pin asserts low is defined as the latch-off state or PWM is not input high level after STB reset release.
When SS capacitance is under 1nF, take note if the in-rush current during startup is too large, or if over boost detection
(FBMAX) mask timing is too short.
Please refer to soft start behavior in the section 3.5.4 Timing Chart .
Pin 6: PWM
This is the PWM dimming signal input terminal. The high / low level of PWM pins are the following.
State
PWM=H
PWM=L
PWM input voltage
PWM=1.5V to 18.0V
PWM=0.3V to 0.8V
Pin 7: FAIL
This is FAIL signal output (OPEN DRAIN) pin. At normal operation, PMOS will be OPEN state, during abnormality
detection PMOS will be in ON (3kohm typ.) state. And Pull Up to VCC.
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
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TSZ02201-0T2T0C100230-1-2
01.Nov.2016 Rev.001

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부품번호상세설명 및 기능제조사
BD9409F

White LED Driver

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