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| 型号： | AS1390A-ZQFT |
| 厂商： | ams |
| 文件页数： | 13/21页 |
| 文件大小： | 0K |
| 描述： | IC BOOST CTLR/BUCK CONV 20-QFN |
| 标准包装： | 6,000 |
| 拓扑： | 降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 背光 |
| 电源电压： | 10 V ~ 30 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
AS1390A, AS1390B
Datasheet - D e t a i l e d D e s c r i p t i o n
8.1.3
Continuous Conduction Mode (CCM)
For normal operation the converter should stay in continuous conduction mode, to ensure that the inductor value must be bigger than L CRIT .
? 1 – --------------------------- ? × V 2 IN × R
V OUT + V D ?
2 × f SW × ( V OUT + V D )
L CRIT
V IN
?
= ----------------------------------------------------------------------
2
(EQ 5)
Where:
V IN ... Input voltage at VDDH
V OUT ... Output voltage
V D ... Diode forward voltage at D1
f SW ... Switching frequency
R ... Load resistor, should be calculated with minimum current load R = V OUT / I OUT_min
I OUT_min ... Minimum output current (e.g. for LED dirver only one LED string is on)
8.1.4
Duty Cycle
Within CCM, the well known relation between input and output voltage is described in the following equation:
V OUT + V D 1
V IN
V IN
this means for the duty cycle:
--------------------------- = -------------
1 – D
D = 1 – ---------------------------
V OUT + V D
(EQ 6)
(EQ 7)
8.1.5
Inductor Current
The inductor current varies during a switching cycle. This variation can be expressed by the mean value of the inductor current and the delta rise/
fall current within each cycle (see Figure 21) .
Figure 21. Inductor Current
Mean inductor current:
I L = -------------
? I L = -------------------
Delta inductor current:
I OUT
1 – D
D × V IN
f S × L
(EQ 8)
(EQ 9)
www.austriamicrosystems.com/Power-Management/AS1390
Revision 1.04
12 - 20
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| AS1390B-BSOT | 功能描述:IC BOOST CTLR/BUCK CONV 16-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| AS1390B-BSOT-500 | 制造商:ams 功能描述:IC BOOST CTRL/BUCK CONV 16-SOIC 制造商:ams 功能描述:T&R / SOIC16 |
| AS13920FLF | 制造商:TT Electronics / IRC 功能描述:AS13920FLF |
| AS13920HLF | 制造商:TT Electronics / IRC 功能描述:AS13920HLF |
| AS13920JLF | 制造商:TT Electronics / IRC 功能描述:AS13920JLF |
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