收藏本站
AS1113
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Constant Current
In LED display applications, the AS1113 provides virtually no current variations from channel-to-channel and from
AS1113-to-AS1113. This is mostly due to 2 factors:
!
!
While I OUT ≥ 10mA, the maximum current skew is less than ±3% between channels and less than ±6% between
AS1113 devices.
In the saturation region, the characteristic curve of the output stage is flat (see Figure 5 on page 7) . Thus, the out-
put current can be kept constant regardless of the variations of LED forward voltages (V F ).
Adjusting Output Current
The AS1113 scales up the reference current (I REF ) set by external resistor (R EXT ) to sink a current (I OUT ) at each out-
put port. As shown in Figure 3 on page 7 the output current in the saturation region is extremely flat so that it is possi-
ble to define it as target current (I OUT TARGET ). I OUT TARGET can be calculated by:
V REXT = 1.253V
I REF = V REXT /R EXT (if the other end of R EXT is connected to ground)
I OUT TARGET = I REF *15 = (1.253V/R EXT )*15
(EQ 1)
(EQ 2)
(EQ 3)
Where:
R EXT is the resistance of the external resistor connected to pin REXT.
V REXT is the voltage on pin REXT.
The magnitude of current (as a function of R EXT ) is around 50.52mA at 372 Ω and 25.26mA at 744 Ω . Figure 3 on
page 7 shows the relationship curve between the I OUT TARGET of each channel and the corresponding external resistor
(R EXT ).
Package Power Dissipation
The maximum allowable package power dissipation (PD) is determined as:
P D(MAX) = (T J -T AMB )/R TH(J-A)
When 16 output channels are turned on simultaneously, the actual package power dissipation is:
P D(ACT) = (I DD *V DD ) + (I OUT *Duty*V DS *16)
Therefore, to keep P D(ACT) ≤ P D(MAX) , the maximum allowed output current as a function of duty cycle is:
I OUT = {[(T J -T AMB )/R TH(J-A) ]-(I DD *V DD )}/V DS /Duty/16
(EQ 4)
(EQ 5)
(EQ 6)
Where:
T J = 150oC
Delayed Outputs
The AS1113 has graduated delay circuits between outputs. These delay circuits can be found between OUTN n and
constant current block.
The fixed delay time is 20 ns (typ) where OUTN0 has no delay, OUTN1 has 20ns delay, OUTN2 has 40ns delay ...
OUTN15 has 300ns delay. This delay prevents large inrush currents, which reduce power supply bypass capacitor
requirements when the outputs turn on (see Figure 10 on page 10)
Switching-Noise Reduction
LED drivers are frequently used in switch-mode applications which normally exhibit switching noise due to parasitic
inductance on the PCB.
Load Supply Voltage
Considering the package power dissipation limits (see EQ 4:6), the AS1113 should be operated within the range of
V DS = 0.4 to 1.0V.
For example, if V LED is higher than 5V, V DS may be so high that P D(ACT) > P D(MAX) where V DS = V LED - V F . In this case,
the lowest possible supply voltage or a voltage reducer (V DROP ) should be used. The voltage reducer allows
V DS = (V LED -V F ) - V DROP .
Note: Resistors or zener diodes can be used as a voltage reducer as shown in Figure 22 .
www.austriamicrosystems.com/LED-Driver-ICs/AS1113
Revision 1.04
19 - 24
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
AS1117-BQFT IC DRIVER 64LED MOBILE 24-TQFN
AS1118-BQFT IC DRIVER 64LED W/DELAY 24-TQFN
AS1121B-BQFT IC DRIVER 16-CH 32-TQFN
AS1122B-BQFT IC LED DVR 12-CH 24-TQFN
AS1123-BTST IC LED DVR 16-CH 40MA 24-QSOP
AS1390A-ZQFT IC BOOST CTLR/BUCK CONV 20-QFN
AS212-L SOCKET 12V AUTO SAFETY CAP MNT
AS212C AUTO 12V SOCKET W/SAFETY CAP
相关代理商/技术参数
AS1113BSSU 制造商:AMS 功能描述:IC LED DRIVER CONSTANT CURRENT SSOP24 制造商:AMS 功能描述:IC, LED DRIVER, CONSTANT CURRENT, SSOP24 制造商:AMS 功能描述:IC, LED DRIVER, CONSTANT CURRENT, SSOP24; Topology:Constant Current; No. of Outputs:16; Output Current:50mA; Output Voltage:15V; Driver Case Style:SSOP; Input Voltage Min:3V; Input Voltage Max:5.5V; Dimming Control Type:Analogue ;RoHS Compliant: Yes
AS1113-BSSU 功能描述:LED显示驱动器 RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube
AS1113CVB 功能描述:AS1113 - Power Management, Power Over Ethernet (POE) Evaluation Board 制造商:akros silicon 系列:- 零件状态:停产 主要用途:电源管理，以太网供电（POE） 嵌入式:- 使用的 IC/零件:AS1113 主要属性:- 辅助属性:过压，热和欠压保护 所含物品:板 标准包装:1
AS1113-XXX-I-A1-D 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Filter
AS1113-XXX-I-A1-S 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Filter
AS1113-XXX-I-A2-D 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Filter
AS1113-XXX-I-A2-S 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Filter
AS1113-XXX-I-A3-D 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Filter