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| 型号： | AS1390A-ZQFT |
| 厂商： | ams |
| 文件页数： | 14/21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
Peak current:
2 × f S × L
I pk = I L + -------- = ------------- + -----------------------
RMS inductor current:
? I L I OUT D × V IN
2 1 – D
(EQ 10)
I L + ( 1 ? 12 × ? I L )
I RMS =
2
2
(EQ 11)
This peak current is flowing through MN1 during phase 1 and through D1 during phase 2 of each cycle. Therefore this peak current is important
for a proper diode D1, MOSFET MN1 and inductor L1 selection.
Note: The saturation current of the inductor should be about 20 to 30% larger than the peak current
8.1.6
Input Capacitor
The input capacitor has to supply the delta inductor current and it should be selected according to:
C IN > ------------------------------------
? V IN
2 × ? I L
? I L
4 × ? V IN × f SW
ESR < -----------------
(EQ 12)
(EQ 13)
8.1.7
Output Capacitor
The output capacitor must be chosen according to the max allowable output ripple at high load.
C OUT > ------------------------------------
? V OUT
V IN × D
? ------------- + --------------------------- ?
I OUT – max × D
? V OUT × f SW
ESR < -----------------------------------------------------
I OUT
? 1 – D 2 × L × f SW ?
(EQ 14)
(EQ 15)
8.1.8
Current Sense Resistor
I L + 0 , 5 × ? I L
V SENSE
R S – max = -----------------------------------
(EQ 16)
P RS = I
2
L – rms
× R S × D
(EQ 17)
Note: Low inductance and specifically designed current sensing resistors should be used, e.g. Stackpole Electronics CSR/CSRN series of
sensing resistors with less than 0.2nH (typ.).
8.1.9
Compensation Network
For typical use cases a compensation network should be implemented by C10, C11 and R11 for 2D mode and optional by different component
values C12, C13, R13 for 3D mode (see Figure 18 on page 10) .
A typical choice for values of the compensation network is C10 = 100pF, C11 = 10nF, R11 = 100K ? . Use these values as initial choice and
evaluate the transient response of the system to verify the behavior at output load change. To be able to do a different compensation for 3D
mode, a second pin COMP_3D is available. If no separate compensation for 3D mode is necessary, PINs COMP_2D and COMP_3D can be
connected to one common compensation network.
www.austriamicrosystems.com/Power-Management/AS1390
Revision 1.04
13 - 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 |
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| AS13920HLF | 制造商:TT Electronics / IRC 功能描述:AS13920HLF |
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