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参数资料
| 型号： | SC4501MSETRT |
| 厂商： | Semtech |
| 文件页数： | 12/21页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 2A 8MSOP |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-MSOP-EP |
| 其它名称： | SC4501MSEDKR |
SC4501
POWER MANAGEMENT
Application Information
(a)
IN
SC4501
SHDN
(b)
IN
SC4501
SHDN
VIN
1N4148
(c)
IN
SC4501
SHDN
(d)
IN
SC4501
SHDN
Figure 6. Methods of Driving the Shutdown Pin
(a) Directly Driven from a Logic Gate
(b) Driven from an Open-drain N-channel MOSFET or an Open-Collector NPN Transistor (V OL < 0.1V)
(c) Driven from a Logic Gate with V OH > V IN
(d) Combining Shutdown with Programmed UVLO (See Section Below).
Programming Undervoltage Lockout
V H and V L are therefore:
V H = ? ? 1 + 3 ? ? ( 1 . 1 V )
The SC4501 has an internal V IN undervoltage lockout
(UVLO) threshold of 1.4V. The transition from idle to
switching is abrupt but there is no hysteresis. If the input
voltage ramp rate is slow and the input bypass is limited,
then sudden turn on of the power transistor will cause a
dip in the line voltage. Switching will stop if V IN falls below
the internal UVLO threshold. The resulting output voltage
? R ?
? R 4 ?
V L = V H ? V HYS = V H ? I HYS R 3
Re-arranging,
(10)
? 1
rise may be non-monotonic. The 1.1V disable threshold of
the SC4501 can be used in conjunction with a resistive
voltage divider to raise the UVLO threshold and to add an
UVLO hysteresis. Figure 7 shows the scheme. Both V H and
V L (the desired upper and the lower UVLO threshold
voltages) are determined by the 1.1V threshold crossings,
2011
? 2005 Semtech Corp.
12
R 3 =
R 4 =
V HYS
I HYS
R 3
V H
1 . 1
(11)
(12)
www.semtech.com
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| 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 |
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