参数资料
| 型号： | SC4501MLTRT |
| 厂商： | Semtech |
| 文件页数： | 14/21页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 2A 10MLPD |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 32V |
| 输入电压： | 1.4 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-MLPD（3x3） |
| 其它名称： | SC4501MLDKR |
SC4501
POWER MANAGEMENT
Application Information
1 ?
D = 12 + 0 . 5 = 0 . 62
1 ?
= 29 . 4 Krads ? 1 = 4 . 68 KHz
ω p 2 ≤
ω p 1 = ?
= ?
ω Z 1 = ?
= ?
Therefore
and
5
0 . 3
12 + 0 . 5
2
( 6 . 8 Ω ) ? ( 10 μ F )
1 1
R O C 4 4 . 7 M Ω ? 820 pF
= ? 260 rads ? 1 = ? 41 Hz
C 4 and R 3 also forms a zero with angular frequency:
1 1
R 3 C 4 30 . 9 K Ω ? 820 pF
= ? 39 . 5 Krads ? 1 = ? 6 . 3 KHz
ω Z 2 ≥
6 . 8 Ω ? ( 1 ? 0 . 62 ) 2
4 . 7 μ H
= 209 Krads ? 1 = 33 . 3 KHz
The poles p 1 , p 2 and the RHP zero z 2 all increase phase
shift in the loop response. For stable operation, the overall
loop gain should cross 0dB with -20dB/decade slope. Due
should not be higher than . Placing z 1 near p 2 nulls its
The spacing between p 2 and z 2 is the closest when the
converter is delivering the maximum output current from
the lowest V IN . This represents the worst-case compensation
condition. Ignoring C 5 and C 6 for the moment, C 4 forms a
low frequency pole with the equivalent output resistance
to the presence of the RHP zero, the 0dB crossover frequency
z 2
3
effect and maximizes loop bandwidth. Thus
R O =
R 3 4 ≈
V OUT C 2
(15)
R O of the error amplifier:
Amplifier Open Loop Gain
Transcondu c tan ce
=
49 dB
60 μ Ω ? 1
= 4 . 7 M Ω
C
2 I OUT ( MAX )
R 3 determines the mid-band loop gain of the converter.
Increasing R 3 increases the mid-band gain and the crossover
GND
C3
R4
R3
C4
C6
R2
U1
C1
SHDN
R1
C5
L1
C2
D1
VOUT
VIN
Figure 9. Suggested PCB Layout for the SC4501. Notice that there is no via
directly under the device. All vias are 12mil in diameter.
2011
? 2005 Semtech Corp.
14
www.semtech.com
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PDF描述 |
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| SC4502HMLTRT | IC REG BOOST ADJ 1.4A 10MLPD |
| SC4503TSKTRT | IC REG BOOST ADJ 1.4A TSOT23-5 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC4501MSETRT | 功能描述:IC REG BOOST ADJ 2A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| SC4501STDEVB | 制造商:Semtech Corporation 功能描述:EVALUATION BOARD 制造商:SEMTECH 功能描述:Eval Board for SC4501 Step-Up Switching Regulator |
| SC4502 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1.4Amp, 2MHz Step-Up Switching Regulator with Soft-Start |
| SC4502EVB | 制造商:SEMTECH 功能描述:Evaluation Board for SC4502 Series Step-up Switching Regulator |
| SC4502H | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1.4Amp, 2MHz Step-Up Switching Regulator with Soft-Start |
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