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BD9415FS PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BD9415FS
기능 White LED Driver
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BD9415FS 데이터시트, 핀배열, 회로
LED Driver for LCD Backlights
White LED Driver for 4Ch Large LCD Panels
(DC/DC converter type)
BD9415FS
1.1 General Description
BD9415FS is a high efficiency driver for white LEDs and
designed for large LCDs. This IC has a built-in boost
DC/DC converter that employs an array of LEDs as the
light source. BD9415FS has various protection functions
against fault conditions, such as over-voltage protection
(OVP), over current limit protection of DC/DC (OCP),
short circuit protection (SCP), over duty protection
(ODP) and open detection of LED string. Therefore,
BD9415FS is available for the fail-safe design over a
wide range of output voltages.
Key Specifications
Operating power supply voltage11.5V to 35.0V
Oscillator frequency
500kHz(RT=30kΩ)
Operating current
6.2mA (Typ)
Operating temperature range-40°C to +105°C
1.2 Package
SSOP-A32
W(Typ) x D(Typ) x H(Max)
13.60mm x 7.80mm x 2.01mm
Pin pitch 0.80mm
Features
4Ch LED constant current driver (external FET)
Built-in boost DC/DC converter (external FET)
PWM dimming (individual input terminal of 4ch)
Analog dimming (Linear) function
Low heat generation technology
LED protection function (Open/Short protection)
Output Short Protection (OCP)
Over Duty Protection (ODP)
Over Voltage Protection (OVP)
Under Voltage Lockout Protection (UVLO)
Auto restart function
Applications
TV, Computer Display, Notebook, LCD Backlighting.
Figure 1. SSOP-A32
Typical Application Circuit
+
VIN
VCC
REG90
STB
CVCC
CREG90
1 VCC
2 FAILB
3 UVLO
4 REG90
5 STB
6N
7 PGND
8 CS
9 DUTYON
10 OVP
11 S1
12 LED1
13 G1
14 S2
15 LED2
16 G2
AGND 32
SSFB 31
RT 30
DUTYP 29
PWM4 28
PWM3 27
PWM2 26
PWM1 25
LSP 24
VREF 23
G4 22
LED4 21
S4 20
G3 19
LED3 18
S3 17
PWM4
PWM3
PWM2
PWM1
REG90
Figure 2. Typical Application Circuit
Product structure : Silicon monolithic integrated circuit
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product not designed protection against radioactive rays
1/30
TSZ02201-0F2F0C100140-1-2
23.May.2016 Rev.001




BD9415FS pdf, 반도체, 판매, 대치품
BD9415FS
1.6 Absolute Maximum Ratings (Ta=25°C)
Parameter
Power Supply Voltage
Symbol
VCC
Rating
-0.3 to +36
Unit
V
LED1-4
LED1, LED2, LED3, LED4
60
V
FAILB, STB, OVP,
PWM1-4, UVLO, VREF, DUTYON
FAILB, STB, OVP,
PWM1, PWM2, PWM3, PWM4,
UVLO, VREF, DUTYON
20
V
N, REG90, G1-4
N, REG90, G1, G2, G3, G4
13
V
S1-4, DUTYP, RT, SSFB, CS, LSP
S1, S2, S3, S4, DUTYP, RT,
SSFB, CS, LSP
7
V
Power Dissipation
Pd
0.95 *1
W
Operating Temperature Range
Topr
-40 to +105
°C
Junction Temperature
Tjmax
150 °C
Storage Temperature
Tstg
-55 to +150
°C
(*1) Derate by 7.6mW/°C when operating above Ta=25°C.. (Mounted on 1-layer 70mm x 70mm x 1.6mm board)
1.7 Recommended Operating Conditions (Ta=25°C)
Parameter
Symbol
Rating
Unit
Power Supply Voltage
DC/DC Oscillating Frequency
VCC
Fsw
11.5 to 35.0
100 to 1000(*1)
V
kHz
VREF Input Voltage
VREF
0.2 to 2.5
V
LSP Input Voltage
VLSP
0.8 to 3.0
V
PWM Input Frequency
FPWM
90 to 2000
Hz
The operating ranges above are acquired by evaluating the IC separately. Please take care when using the IC in
applications.
(*1) When driving external FET as DC/DC, be careful about the input capacity of the FET being used.
1.8 Electrical Characteristics 1/2 (Unless otherwise specified, VCC=24V, Ta=25°C)
Parameter
Symbol
Total Current Consumption
Min Typ Max Unit
Circuit Current
ICC - 6.2 12.4 mA
Standby Current
Switching Block
N Pin Source ON Resistance
N Pin Sink ON Resistance
REG90 Block
REG90 Output Voltage
REG90 Available Current
IST
RONH
RONL
REG90
IREG90
- 14 25 μA
-
2.5 3.75
Ω
-
3.0 4.5
Ω
8.91 9.0 9.09
V
20 -
- mA
REG90_UVLO Detect Voltage REG90_TH
4.7 5.4 6.1
V
Over Current Limit Protection (OCP) Block
OCP Detect Voltage
VOCP
0.405
Error Amplifier Block
Error Amplifier Base Voltage
SSFB Source Current
(Soft Start)
SSFB Sink Current
VERR
ISSFBSO_S
ISSFBSINK
0.7
-13
80
SSFB source Current
ISSFBSOUR -115
CT Oscillator Block
Oscillation Frequency
FCT
440
MAX DUTY
DUTY_MAX
91
Short Circuit protection (SCP) detect Block
SCP Detect Voltage
VSCP
0.05
0.450
0.8
-10
100
-100
500
95
0.20
0.495
0.9
-7
120
-85
560
99
0.35
V
V
μA
μA
µA
kHz
%
V
Condition
VSTB=3.0V, LED1-4=2V,
RT=30kΩ
VSTB=0V
ION=-10mA
ION=10mA
IO=0mA
VREG=SWEEP DOWN,
VSTB=0V
VCS=SWEEP UP
VREF=1.5V
VSSFB=2V
LED=2.0VVSSFB=1.0V
LED=0VVSSFB=1.0V
RRT=30kΩ
VOVP=SWEEP DOWN
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
4/30
TSZ02201-0F2F0C100140-1-2
23.May.2016 Rev.001

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BD9415FS 전자부품, 판매, 대치품
BD9415FS
2.1 Pin Descriptions
○PIN1VCC
This is the power supply pin of the IC. Input range is from 11.5V to 35V.
The operation starts at more than 7.5V(Typ) and shuts down at less than 7.2V(Typ).
○PIN2FAILB
This is FAILB signal output (OPEN DRAIN) pin. At normal operation, NMOS will be in OPEN state, during abnormality
detection NMOS will be in ON (500 ohm(Typ))state.
○PIN3UVLO
Under Voltage Lockout pin is the input voltage of the power stage. IC starts boost operation if UVLO is more than
2.5V(Typ) and stops if lower than 2.4V(Typ). It can also be used for reset when latched off by protection.
The power of step-up DC/DC converter needs to be set detection level by dividing the resistance.
○PIN4REG90
The REG pin is used in the DC/DC converter driver block to output 9V. Available current is 20mA(Min). Using the REG pin
at current higher than 20mA can affect the IC base voltage, causing the IC to malfunction and leading to heat generation
of the IC itself. To avoid this problem, it is recommended to make load setting to the minimum level.
The characteristic of VCC line regulation at REG90 is shown as [Figure 6]. VCC must be used in more than 11.5V for
stable 9V output. Place the ceramic capacitor connected to REG90 pin (2.2uF to 10uF) closest to REG90-AGND pin.
○PIN5STB
This is the ON/OFF setting terminal of the IC. It is allowed for use to reset the IC from shutdown.
The IC state is switched according to voltages input in the STB pin.
Avoid using the STB pin between two states (0.8 to 2.0V).
○PIN6N
The N pin is used to output power to the external NMOS gate driver for the DC/DC converter in the amplitude range of
approximately 0V to 9V. Output ON resistance H - side is 2.5Ω (Typ) and L-side is 3.0Ω (Typ).
Frequency can be set by the resistor connected to RT. Refer to <RT> pin description for the frequency setting.
○PIN7PGND
The PGND pin is a power ground pin for the driver block of the N output pin.
○PIN8CS
CS pin is current detector for DC/DC current mode inductor current control pin.
Current flowing through the inductor is converted into voltage by the current sensing resistor RCS connected to the CS
pin and this voltage is compared with voltage set with the error amplifier to control the DC/DC output voltage. The CS pin
also incorporates the over current protection (OCP) function. If the CS voltage reaches 0.45V(Typ) or more, switching
operation will be forced to stopped.
○PIN9DUTYON
This is the ON/OFF setting terminal of the LED PWM Over Duty Protection (ODP). By adjusting DUTYON input voltage, it
is ON/OFF of the ODP adjusted.
State
ODP=ON
ODP=OFF
DUTYON input voltage
DUTYON= -0.3V to +0.8V
DUTYON= +1.5V to +18.0V
○PIN10OVP
The OVP pin is an input pin for over voltage protection and short circuit protection of DC/DC output voltage. When voltage
of it exceeds 3.0V(Typ), N pin will stop. This case is not CP count. When OVP pin voltage <0.2V(Typ) or lower, short
circuit protection (SCP) function is activated, and output of gate driver will become low immediately. And system is
stopped after a CP count. The setting example is separately described in the section ”3.2.6 OVP Setting”.
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
7/30
TSZ02201-0F2F0C100140-1-2
23.May.2016 Rev.001

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부품번호상세설명 및 기능제조사
BD9415FS

White LED Driver

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