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参数资料
| 型号： | AS1109 EB |
| 厂商： | ams |
| 文件页数： | 20/25页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL AS1109 |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 0.5 ~ 100 mA |
| 输出及类型： | 8，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： | AS1109 |
AS1109
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
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 8 output channels are turned on simultaneously, the actual package power dissipation is:
P D(ACT) = (I DD *V DD ) + (I OUT *Duty*V DS *8)
Therefore, to keep P D(ACT) ≤ P D(MAX) , the allowable maximum 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/8
(EQ 4)
(EQ 5)
(EQ 6)
Where:
T J = 150oC
9.6 Delayed Outputs
The AS1109 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 ... OUTN7 has 140ns delay. This
delay prevents large inrush currents, which reduce power supply bypass capacitor requirements when the outputs turn on (see Figure 12 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 AS1109 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 .
Figure 24. Voltage Reducer using Resistor (Left) and Zener Diode (Right)
Voltage Supply
Voltage Supply
V LED
V F
}
V DROP
V DS
V DROP
{
V F
V DS
V LED
AS1109
AS1109
Revision 1.21
19 - 24
相关PDF资料 |
PDF描述 |
|---|---|
| AS1110 EB | BOARD EVAL AS1110 |
| AS1112 EB | BOARD EVAL AS1112 |
| AS1115 DB-YELLOW | BOARD DEMO AS1115 YELLOW |
| AS1116 DB-YELLOW | BOARD DEMO AS1116 YELLOW |
| AS3691A EB | BOARD EVAL AS3691A |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AS1109-QF_EK_ST | 功能描述:AS1109 8, 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:8，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:AS1109 标准包装:1 |
| AS110R0JLF | 制造商:TT Electronics / IRC 功能描述:AS110R0JLF |
| AS110R2FLF | 制造商:TT Electronics / IRC 功能描述:AS110R2FLF |
| AS110R2HLF | 制造商:TT Electronics / IRC 功能描述:AS110R2HLF |
| AS110R2JLF | 制造商:TT Electronics / IRC 功能描述:AS110R2JLF |
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