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参数资料
| 型号： | AS1110 EB |
| 厂商： | ams |
| 文件页数： | 20/25页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL AS1110 |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 0.5 ~ 100 mA |
| 输出及类型： | 16，非隔离 |
| 输出电压： | 0 ~ 15 V |
| 特点： | 过热保护，开路 LED，短路 LED，诊断 |
| 输入电压： | 3 ~ 5.5 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | AS1110 |
AS1110
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9.3 Constant Current
In LED display applications, the AS1110 provides virtually no current variations from channel-to-channel and from AS1110-to-AS1110. 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 AS1110 devices.
?? In the saturation region, the characteristic curve of the output stage is flat (see Figure 5 on page 7) . Thus, the output current can be kept
constant regardless of the variations of LED forward voltages (V F ).
9.4 Adjusting Output Current
The AS1110 scales up the reference current (I REF ) set by external resistor (R EXT ) to sink a current (I OUT ) at each output port. As shown in
Figure 3 on page 7 the output current in the saturation region is extremely flat so that it is possible 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 ).
9.5 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
9.6 Delayed Outputs
The AS1110 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 11 on
9.7 Switching-Noise Reduction
LED drivers are frequently used in switch-mode applications which normally exhibit switching noise due to parasitic inductance on the PCB.
9.8 Load Supply Voltage
Considering the package power dissipation limits (see EQ 4:6), the AS1110 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 .
Revision 1.6
19 - 24
相关PDF资料 |
PDF描述 |
|---|---|
| AS1112 EB | BOARD EVAL AS1112 |
| AS1115 DB-YELLOW | BOARD DEMO AS1115 YELLOW |
| AS1116 DB-YELLOW | BOARD DEMO AS1116 YELLOW |
| AS3691A EB | BOARD EVAL AS3691A |
| AS5030 DB | BOARD DEMO AS5030 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AS1110-QF_EK_ST | 功能描述:AS1110 16, Non-Isolated Output LED Driver Evaluation Board 制造商:ams 系列:- 零件状态:有效 电流 - 输出/通道:100mA 输出和类型:16，非隔离 电压 - 输出:15V 特性:过热保护，开路 LED，短路 LED，诊断 电压 - 输入:3 V ~ 5.5 V 所含物品:板 使用的 IC/零件:AS1110 标准包装:1 |
| AS11110 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| AS11110-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 |
| AS11110-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 |
| AS11110-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 |
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