FAN5345S20X [ONSEMI]
LED 驱动器，串行升压，带单线数字接口;
| 型号： | FAN5345S20X |
| 厂家： | 
ONSEMI |
| 描述： | LED 驱动器，串行升压，带单线数字接口 驱动 光电二极管 接口集成电路 驱动器 |
| 文件： | 总16页 (文件大小：2135K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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September 2011
FAN5345
具有单线数字接口的串联升压型LED驱动器
说明
产品特性
FAN524是一异步恒LED驱动器，采用串联驱动方式使每
颗LE具有同等度当输出电压为20V时，FAN5345S20X可
以动串联LED。当输出电压为30V时，可以驱动8只串联
LED。其定开关频率为1.2MHz，允使用小电感与小电
容，因此在小尺寸应用场合中，该驱动器成为优先选用器件。
.
.
异步升压变换器
驱动串联LED:
FAN5345S20X:20V 输出
FAN5345S30X:30V 输出
FAN535采用单线数控接口，可通过数字脉冲对LED的亮度进
3级线性调整。
.
.
输入电压范围：2.5V－5.5V
单线数控接口，可设置LED亮度等级
安全方面，器件整合了过、过流、短路检测和热关断保护功
能。此外，若电池电压过低将触发输入欠压闭锁保护。
32级线性调整
.
.
.
.
.
.
.
1.2MHz 固定开关频率
软启动
FAN5345采用6线SSOT23封装。
FAN535符合“绿色”和oHS标准。(有关飞兆半导体“绿色”的
定义，请参考
输入欠压锁定(UVLO)
输出过压保护 (OVP)
短路检测
http://ww.fairchildsemi.com/company/green/index.html )。
热关闭保护（TSD）
小尺寸6 引线SSOT23封装
适用范围
.
.
.
.
移动电话
移动互联网设备
便携式媒体播放器
PDA、DSC、MP3 播放器
订购信息
器件型号
输出电压选择
温度范围
-40 至 +85℃
封装
FAN5345S20X
FAN5345S30X
20V
30V
6-引线, Super-SOT™-6, JEDEC MO-193,
1.6mm 宽 (MA06A)
.
© 2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5345 • Rev. 1.0.0
典型应用图
L = 10µH
L1
SW
D
VIN
1
2
4
6
5
3
2.5V to 5.5V
CIN = 10µF
GND
EN
FAN5345
VOUT
FB
COUT = 1µF
3 – 8 LEDs
RSET = 12.4@ ILED = 20mA
RET = 10.0@ ILED = 25mA
图 1.典型应用
框图
6
5
SW
GATE
DRIVE
VOUT
2
4
GND
EN
BOOST
CONTROL
OVP/
SCD
REN
Digital I/F
3
FB
图 2.功能框图
©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5345 • Rev. 1.0.0
2
引脚布局
1
2
3
6
5
4
VIN
GND
FB
SW
VOUT
EN
图 3.管脚分配俯视图
引脚说明
引脚号
名称
VOUT
VIN
说明
5
1
4
升压输出电压。升压稳压器的输出。LE连到该引脚。连接 COUT（输出电容）至GND。
输入电压。接入电源，并连接退耦CIN至地。
EN
启用亮度控制。采用数字脉冲驱该引脚可编制调光等级。
电压反馈点。升压稳压引脚压调至0.250V以控制LED的串行电流。将该引脚连接GND和
LED串阴极之间的电流RSET）。
3
FB
6
2
SW
开关节点。在VIN管脚之间串联L1
接地。直接连至GND平面。
GND
©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5345 • Rev. 1.0.0
3
绝对最大额定值
超过绝对最大额定值，会毁损器件。在推荐的工作条件之上，该器件可能无法正常运行或操作，因此不建议让器件在这些条件下
长期工作。此外，过度暴露在高于推荐的工作条件下，会影响器件的可靠性。绝对最大额定值仅是极端额定值。
符号
VIN
参数
最小值 最大值
单位
V
-0.3
-0.3
-0.3
-0.3
–0.3
-0.3
6.0
VIN + 0.3
22.0
VIN 引脚
VFB, VEN
V
FB、EN引脚
FAN5345S20X
V
VSW
VOUT
ESD
SW 引脚
FAN5345X30X
33.0
V
FAN5345S20X
22.0
V
VOUT 引脚
FAN5345X30X
33.0
V
人体模型满足JESD22-A114
充电器件模型满足JESD-C101
1.5
1.5
kV
静电放电防护
TJ
TSTG
TL
-40
-65
150
+150
+260
°C
°C
°C
结温
存储温度
引线焊接温度，10秒
推荐工作条件
推荐的操作条件表定义了实际器件的工作条件工作条件下器件达到数据表中规格的最佳性能达到数据表中的规格。
飞兆半导体建议不要超过推荐工作条件设计电按照绝对最大定值进行设计系。
符号
参数
说明
最小值
最大值
单位
2.5
5.5
VIN
V
V
V
IN 电源电压
OUT 电压(1)
V
FAN5345S20X
FAN5345S30X
6.2
6.2
5
18.5
28.5
25
VOUT
V
IOUT
TA
OU
mA
°C
-40
-40
+85
环境
结温
+125
TJ
°C
说明：
1. 应用必须确保最大和最小占空比在20-85%之间，方可满足指定电压范围。
热性能
结-环境之间热阻与具体应用和电路板布局有关。该数据由2s2p四层板测得，符合JESD51-JEDEC标准。特别注意的是，不要超过
给定环境温度TA时的结温 TJ(max)
。
符号
参数
典型值
单位
151
°C/W
结-环境之间热阻，SSOT23-6 封装
JA6
©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5345 • Rev. 1.0.0
4
电气规格
VIN = 2.5V 至 5.5V, TA = -40°C至 +85°C，除非另有说明。典型值测量条件为 TA = +25°C 且 VIN = 3.6V。
符号
电源
ISD
IQ(ACTIVE) 静态电流 ILOAD = 0mA
参数
工作条件
最小值 典型值 最大值 单位
EN = GND
器件未开关，无负载
0.30
300
2.35
2.05
250
0.90
A
A
待机电流
2.10
1.80
2.60
2.30
V
V
IN 上升
IN 下降
VUVLO
V
欠压闭锁阈值
VUVHYST
mV
欠压锁定迟滞电压
EN:启用引脚
VIH
VIL
REN
TLO
THI
输入电压高电平阈值
输入电压低电平阈值
EN 下拉电阻
EN 低电平 调光时间(3)
压差延时(3)
1.2
V
V
0.4
400
300
200
0.5
0.5
300
k
µs
µs
ms
VIN = 3.6V;图28
VIN = 3.6V; ;图2
TSD
1
EN 低电平，关断脉冲宽度
VIN = 3.6V; 自EN的降沿
反馈参考电压
ILED = 20m-40°C+85°C,
2N ≤ V
VFB
230
250
0.1
270
1.0
mV
反馈电压
IFB
反馈输入电流
V
A
电源输出
VIN = 3.6V, ISW = 100mA
600
650
0.1
RDS(ON)_Q1 升压开关接通电阻
m
A
N = 2.5V, ISW = 100mA
SW 节点漏电流(
ISW(OFF)
EN = 0, VIN = VSW = VOUT = 5.5V, VLED = 0V
2.0
400
FAN5345S20X:VIN .2V 至 4.3V, TA =
20°C 至 +60°C, VF = 3.4V, 4 LEDs
200
500
300
750
ILIM-PK
mA
升压开关峰值电
升压关频率
FAN5345S30X
1000
振荡器
fSW
0.95
1.15
1.35
MHz
输出和保护
FAN5345S20X
FA5345S30X
FAN5345S20X
FAN5345S30X
18.0
27.5
20.0
30.0
21.5
32.5
升压输出过压保护 (OVP)
OVP 迟滞电压
VOVP
V
0.8
1.0
VTLSC
VTHSC
DMAX
DMIN
V
V
OUT 短路检测阈值
OUT 短路检测阈值
V
V
OUT下降
OUT 上升
VIN – 1.4
VIN – 1.2
V
V
最大升压占空比(3,4)
最小升压占空比(3,4)
热关闭温度
85
%
20
TTSD
150
35
°C
°C
THYS
热关闭迟滞温度
说明:
2. SW 漏电流包括包括两个内部开关的漏电流；SW 至 GND 与 SW 至 VOUT.。
3. 量产未测试；由设计保证。
4. 应用必须确保最大和最小占空比在20-85%之间，方可满足指定电压范围。
©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5345 • Rev. 1.0.0
5
典型特性
VIN = 3.6V, TA = 25C, ILED = 25mA, L = 10µH, COUT = 1.0µF, 且 CIN = 10.0µF.
90%
80%
70%
60%
50%
90%
80%
70%
60%
50
VIN=2.5V
VIN=2.7V
VIN=3.6V
VIN=4.2V
VIN=4.5V
VIN=2.5V
N=2.7V
VIN=3V
VI.2V
N=4.5V
5
10
15
20
25
5
10
15
20
25
25
25
LED Current (A)
图 5.4 LED：效率 vs LED 电流 vs.输入电压
LED Current (mA)
图 4. 3 LED：效率 vs LED 电流 vs.输入电压
90%
90%
80%
0%
60%
50%
80%
70%
60%
50%
VIN=2.5V
VIN=2.7V
VIN=3.6V
VIN=4.2V
VIN=4.5V
VIN=2.5V
VIN=2.7V
VIN=3.6V
VIN=4.2V
VIN=4.5V
5
10
15
20
5
20
25
LED Current (mA)
图 7. 6 LED：效率 vs LED 电流 vs.输入电压
ED Current (mA)
图 6. 5 vs LED 电流 vs.输入电压
90%
90%
80%
70%
60%
50%
80%
70%
60%
50%
VIN=2.5V
VIN=2.7V
VIN=3.6V
VIN=4.2V
VIN=4.5V
VIN=2.9V
VIN=3.6V
VIN=4.2V
VIN=4.5V
5
10
15
20
5
10
15
20
25
LED Current (mA)
图 8. 7 LED：效率 vs LED 电流 vs.输入电压
LED Current (mA)
图 9. 8 LED：效率 vs LED 电流 vs.输入电压
©2011 Fairchild Semiconductor Corporation
FAN5345 • Rev. 1.0.0
www.fairchildsemi.com
6
典型特性
VIN = 3.6V, TA = 25C, ILED = 25mA, L = 10µH, COUT = 1.0µF, 且 CIN = 10.0µF.
90%
80%
70%
60%
5
90%
80%
70%
60%
50%
-40C
+25C
+85C
-40
5C
+85C
.5
3.0
3.5
4.0
4.5
4.5
4.5
2.5
3.0
3.5
4.0
4.5
Input Voltage (V)
InputVoltage
图 10.5只串联LED时效率vs.输入电压vs.温度
图 11.7只串联LED时效率vs.输入电压vs.温度
1250
0.2
0.1
1200
11
1100
1050
1000
0.0
-0.1
-0.2
-0.3
-0.4
-40°C
+25°C
+85°C
-40°C
+25°C
+85°C
2.5
4.0
45
2.5
3.0
3.5
4.0
put Voltage (V)
InputVoltage (V)
图 12.VFB随输度的变化，7 LED，L=10µH 且
图 13.频率 vs.输入电压vs.温度
COUT=1.0µF
31.5
31.0
30.5
30.0
29.5
29.0
21.0
7 LEDs
L = 10µH
COUT = 1.0µF
ILED = 25mA
5 LEDs
L = 10µH
COUT =1.0µF
ILED = 25mA
20.5
20.0
19.5
19.0
18.5
2.5
3.0
3.5
4.0
4.5
2.5
3.0
3.5
4.0
InputVoltage (V)
InputVoltage (V)
图 14.OVP vs. 输入电压:FAN5345S20X
图 15.OVP vs. 输入电压:FAN5345S30X
©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5345 • Rev. 1.0.0
7
典型特性
VIN = 3.6V, TA = 25C, ILED = 25mA, L = 10µH, COUT = 1.0µF, 且 CIN = 10.0µF.
0.80
0.60
0.40
0.20
0.00
265
260
255
250
245
240
235
230
225
2.50
3.0
3.50
4.00
4.50
2.50
3.00
3.50
4.00
4.50
VIN (V)
VIN (V)
图 16.待机电流 vs.输入电压
图 17.静态电流 vs.输入电压
18.调光操作
图 19. 5 LED 时的线性瞬态响应
图 20. 6 LED时的线性瞬态响应
图 21. 7 LED时的线性瞬态响应
©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5345 • Rev. 1.0.0
8
典型特性
VIN = 3.6V, TA = 25C, ILED = 25mA, L = 10µH, COUT = 1.0µF, 且 CIN = 10.0µF.
图 22.5只LED时的开关电压、电感电流、VFB及EN 的启动波
图 23.5 LED的VOUT, 开关电压，电感电流的稳态波形
图 24.6只LED时、电感电流、VFB及EN 的启动波形
图 25.6 LED的VOUT, 开关电压，电感电流的稳态波形
图 26.7只LED时的开关电压、电感电流、VFB及EN 的启动波形
图 27.7 LED的VOUT, 开关电压，电感电流的稳态波形
©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5345 • Rev. 1.0.0
9
电路说明
概述
数字调光控制
FAN5345是一种感应电流模式升压串联LED驱动器，通过保持
电阻RSET 端电压为0.250V，实现LED电流调节。 LED 串的电
流（ILED）的计算公式为：
FAN5345启动时驱动LED为最大亮度等级。启动后，控制逻辑
可接受施加在EN管脚的编程脉冲的上升沿个数来逐步降低亮
度。图28 显示了FAN5345 的数字脉冲的调光控制。软启动结
束前，调光控制功能不起作用。软启动大约需要2ms。
0.250
ILED
(1)
过流和短路检测
RSET
对于FAN5345S20X 与FAN5345S30X，升压稳压器的周期性的
电感电流峰值限制分别为300mA（典型值）与750mA（典型值
）。
输出电压VOUT取决于每只LED的正向电压与RSET端电压之和，
SET端电压为恒值250mV。
R
过压/开路保护
UVLO 和软启动
如果LD串开路FB保持为0V，且当没有过压保护（OVP）
电时输出电压持续增加。当输出电压OUT超过20.0V时，
AN5345SX的过压保护（OVP）电路起动，保持稳压器升压
调 节 关 闭 ， 直 到 VOUT 跌 落 低 于 19.0V 为 止 。 对 于
FN5345S30X，过压保护值是30.0V，且当VOUT低于29.0V时，
该器件恢复正常状态。
假定VIN大于UVLO阀值，如果EN处于低电平时间超过1ms，当
EN上升时，IC开始“冷启动”软启动。
驱动八只串联LED
FAN5345S30X可以驱动8只串联LED，但是输入电压(VIN)的最
小值必须大于或等于2.9V，而白色LED的正向电压应该小于或
等于3.2V，同时为了维持稳态运行，LED的最大电流能超过
20mA。
热关闭
晶圆温度超过150°C时，发生复位并保持，直至晶圆冷却至
115℃；此时允许电路开始软起动序列。
数字接口
FAN5345使用单线数字接口编程控制LED亮度线性
等级。通过单线解决方案，FAN5345需要系统连续提
供信号来驱动LED。
tSD
tI
tLO
EN
28
3
4
29
30
31
0
1
0
2
Level 32: 100%
Level 32: 100%
Level 31
Level 31
Level 30
Level 29
Level 28
Level 5
Shutdown
Level 4
Shutdown
Level 3
Level 2
Level 1
IWLED
图 28.数字脉冲调光控制图
©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5345 • Rev. 1.0.0
10
应用信息
参考原理图，图29。在输入电压大于等于2.9V（VIN ≥ 2.9V）
时，FAN5345可以驱动多达8只LED。但是，可以使用的LED
数量取决于正向电压。建议白色LED的正向电压(VF)不高于
3.2V，LED的最大电流为20mA。FAN5345可以用作升压变换
器，应用时VOUT端直接与负载相连同时负载的回线也应该通
过检测电阻(R1)返回到地。
9.参考应用原理图
输入电容与回线
推荐的器件和PCB布局
在bck或boo开关稳压器布局中，应优先考虑输入电容。一
个稳定的入电源（VIN）可以使得开关型稳压器表现出最佳
性能。稳压器运行时，其开关频率很高，输入电容为了使在同
样开关频率下保持输入电源稳定，CIN上的负载会动态变化。
为了确保稳定的输入电源，CIN需要保持足够的能量，才能最
小化稳压器输入管脚的变化。为了使CIN具有快速的充放电响
应，CIN与稳压器输入管脚之间布线以及CIN与稳压器GND之间
的回线应该尽可能的粗短，以此来最小化布线电阻、电感与电
容。在运行过程中，开关过程会导致由 CIN流出、流经稳压器
后从负载流出、并流回CIN的电流含有高频波动。由于 I2R 损
耗的缘故，布线电阻可以降低总效率。即使是很小布线电感也
能有效地引起地电平的变化，给 VOUT带来噪声。应该将输入
电容就近放置在稳压器的VIN与GND管脚旁，并且布线应该越
短越好。由于过孔在高频时具有很强的电感效应，因此应该避
免在不同层间布置回线。如果不可避免的要布线到其他的PCB
层，那么过孔应紧靠稳压器的VIN与GND管脚，以此来最小化
布线距离。
输出电容与回线
输出电容不仅与输入电容具有相同的作用，而且也能保证输出
电压稳定。如上所述，电流流向负载并返回到COUT 的GND
端。COUT应该就近放置在VOUT管脚处。COUT到L1、VOUT间
的布线以及由负载到COUT间的回线应尽可能的短粗，以此来
最小化布线电阻与电感。为了最小化负载的耦合噪声，可以在
VOUT与COUT间放置一低容值电容，这样，高频噪声在到达负
载前即可回到地中。
图 30.参考用 PCB 布局
FAN5345可以升高输出电压，工作频率为1.2MHz。为了确保
稳定输出并阻止噪声的产生，应当谨慎地考虑元器件的摆放与
PCB布局。图30给出了FAN5345评估板的一部分。关键布局器
件包括：L1, CIN, CIN 回线, COUT, 以及 COUT 回线。
©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5345 • Rev. 1.0.0
11
应用性能。检测电阻到FB引脚的回线应该简短，且远离一切
高频开关信号线。有必要将地平面放置在回路之下。如果回路
下的地平面有噪声，但是与稳压器的地平面不同，该噪声就会
通过PCB寄生电容耦合到FB管脚，产生噪声输出。
电感
根据以上原因，电感（L1）应该尽可能近地放置在稳压器附
近，以此来最小化布线电阻与电感。
检测电阻
在图30 中，CIN, COUT与 L1均靠近稳压器放置。所有的布线都
放在同一层，可以减小地平面电阻、电感。整个PCB面积为
67.2mm2 (7.47mm x 8.99mm)，其中不包括检测电阻。
根据检测电阻提供的反馈信号，使稳压器控制输出电压。检测
电阻到FB管脚的长布线向FB管脚耦合了噪声。如果FB管脚耦
合了噪声，那么将会引起开关稳压器的不稳定运行，进而影响
表 1.建议使用的外部器件
器件型号
生产厂商
电感 (L)
LQH43MN100K03
Murat
TD
NLCV32T-100K-PFR
10.0µH
VLF3010AT-100M9-1
TDK
DEM2810C 1224-AS-H-1M
TOKO
最小 COUT
1.0µF
CVX5R1025T
AVX/Kyocera
Murata
最小 CIN
10µF
GRA106KE51L
肖特基二极管
N/A
RBS520S30
RB520S-30
Fairchild Semiconductor
Rohm
N/A
©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5345 • Rev. 1.0.0
12
物理尺寸
图 31.6引脚 SuperSOT™-6，JEDEC MO-193, 1.6mm宽
封装图纸是作为一项服务，提供给考虑飞兆半导体产品的客户。具体参数可进行改动，且无需做出相应通知。请注意图纸上的版本和/或日期，
并联系飞兆半导体代表核实或获得最新版本。封装规格并不超出飞兆公司全球范围内的条款与条件，尤其指保修，保修涉及飞兆半导体的全部产
品。
随时访问飞兆半导体在线封装网页，可以获得最新的封装图:
http://www.fairchildsemi.com/packaging/。
©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5345 • Rev. 1.0.0
13
©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5345 • Rev. 1.0.0
14
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