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PDF ( 数据手册 , 数据表 ) RT8475

零件编号 RT8475
描述 High Voltage High Current LED Driver Controller
制造商 Richtek
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RT8475 数据手册, 描述, 功能
®
RT8475
High Voltage High Current LED Driver Controller for
Buck, Boost or Buck-Boost Topology
General Description
The RT8475 is a current mode PWM controller designed
to drive an external MOSFET for high current LED
applications. With a current sense amplifier threshold of
190mV, the LED current is programmable with one
external current sense resistor. With the maximum
operating input voltage of 36V and output voltage up to
90V, the RT8475 is ideal for buck, boost or buck-boost
operation.
With the switching frequency programmable over 100kHz
to 1MHz, the external inductor and capacitors can be small
while maintaining high efficiency.
Dimming can be done by either analog or digital. The built-
in clamping comparator and filter allow easy low noise
analog dimming conversion from digital signal with only
one external capacitor.
The RT8475 is available in SOP-14 and WQFN-16L 3x3
packages.
Ordering Information
RT8475
Package Type
S : SOP-14
QW : WQFN-16L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Note :
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Features
z High Voltage Capability : VIN Up to 36V, LED Sensing
Threshold Common Mode Voltage Up to 90V
z Buck, Boost or Buck-Boost Operation
z Programmable Switching Frequency
z Easy Dimming Control : Analog or Digital
Converting to Analog with One External Capacitor
z Programmable Soft-Start to Avoid Inrush Current
z Programmable Over Voltage Protection
z VIN Under Voltage Lockout and Thermal Shutdown
z RoHS Compliant and Halogen Free
Applications
z General Industrial High Power LED Lighting
z Desk Lights and Room Lighting
z Building and Street Lighting
z Industrial Display Backlight
Pin Configurations
(TOP VIEW)
RSET
ISW
ISP
ISN
VC
ACTL
DCTL
2
3
4
5
6
7
14 GATE
13 GBIAS
12 GND
11 VCC
10 OVP
9 EN
8 SS
SOP-14
16 15 14 13
RSET
ISW
ISP
ISN
1
2
3
4
GND
17
12 GND
11 VCC
10 OVP
9 EN
5 678
WQFN-16L 3x3
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8475-03 October 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1







RT8475 pdf, 数据表
RT8475
VISP – VISN Threshold vs. Input Voltage
200
195
190
185
180
4
8 12 16 20 24 28 32 36
Input Voltage (V)
ACTL Off Threshold vs. Input Voltage
0.28
0.27
0.26
0.25
0.24
0.23
0.22
0.21
0.20
4
8 12 16 20 24 28 32 36
Input Voltage (V)
450
400
350
300
250
200
150
100
50
0
0
LED Current vs. DCTL PWM Duty
f = 10kHz
20 40 60 80
DCTL PWM Duty (%)
100
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
8
VISP – VISN Threshold vs. Temperature
200
195
190
185
180
-50
-25
0 25 50 75
Temperature (°C)
100 125
450
400
350
300
250
200
150
100
50
0
0.2
LED Current vs. ACTL Voltage
0.4 0.6 0.8 1 1.2
ACTL Voltage (V)
1.4
150
140
130
120
110
100
90
80
70
60
50
4
ISW Threshold vs. Input Voltage
8 12 16 20 24 28 32
Input Voltage (V)
36
is a registered trademark of Richtek Technology Corporation.
DS8475-03 October 2012







RT8475 equivalent, schematic
RT8475
D
E
SEE DETAIL A
D2
L
1
E2
eb
11
22
A
A1 A3
DETAIL A
Pin #1 ID and Tie Bar Mark Options
Note : The configuration of the Pin #1 identifier is optional,
but must be located within the zone indicated.
Symbol
A
A1
A3
b
D
D2
E
E2
e
L
Dimensions In Millimeters
Min
0.700
Max
0.800
0.000
0.050
0.175
0.250
0.180
2.950
0.300
3.050
1.300
2.950
1.750
3.050
1.300
1.750
0.500
0.350
0.450
Dimensions In Inches
Min
0.028
Max
0.031
0.000
0.002
0.007
0.010
0.007
0.116
0.012
0.120
0.051
0.116
0.069
0.120
0.051
0.069
0.020
0.014
0.018
W-Type 16L QFN 3x3 Package
Richtek Technology Corporation
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789
Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should
obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot
assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be
accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries.
www.richtek.com
16
DS8475-03 October 2012










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