参数资料
| 型号： | SC2440TETRT |
| 厂商： | Semtech |
| 文件页数： | 14/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 2A DL 16TSSOP |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出数： | 2 |
| 输入电压： | 2.8 V ~ 20 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.4MHz |
| 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-TSSOP |
| 产品目录页面： | 1358 (CN2011-ZH PDF) |
| 其它名称： | SC2440TEDKR |
SC2440
POWER MANAGEMENT
Applications Information
MAX V BST = V I N + V OUT
DBST
DBST
MAX V BST = 2V I N
VIN
IN
BOOST
SW
CBST
VOUT
VIN
IN
BOOST
SW
CBST
VOUT
SC2440
GND
D
RECT
SC2440
GND
D
RECT
(a)
(b)
VS > 2.5V
DBST
MAX V BST = V I N + V S
VS > VIN + 2.5V
DBST
MAX V BST = V S
BOOST
CBST
BOOST
VIN
IN
SW
VOUT
VIN
IN
SW
VOUT
SC2440
GND
D
RECT
SC2440
GND
D
RECT
(c)
(d)
Figure 8. Methods of Bootstrapping the SC2440.
The switch base current =
≈ SW , where I SW and β
I SW T ON
a
β
I SW T ON
aC BST
≈ SW OUT .
I SW V IN T ON DI SW V IN I V
β
β
β
V A ? V D BST + V D RECT ?
I SW T ON
β C BST
I SW T ON
β
I SW V OUT T ON
β
I SW I
a + 1 a
are the switch emitter current and current gain
respectively, is drawn from the bootstrap capacitor C BST .
Charge is drawn from C BST during the switch on
time, resulting in a voltage droop of . If I SW = 2A,
T ON = 1 μ s, β = 35 and C BST = 0.1 μ F, then the V C BST droop
will be 0.57V. C BST is refreshed to V A ? V D BST + V D RECT everyy
cycle, where V A is the applied D BST anode voltage. Switch
base current discharges the bootstrap capacitor to
at the end of conduction. The
difference between this voltage and that at SW must be
higher than the minimum shown in Figure 7 to maximize
efficiency. D BST can be tied either to the input or to the
output of the DC/DC converter.
If D BST is tied to the input, then the charge drawn from
I SW T ON
the input power supply will be (the base charge
of the switch). The energy loss due to base charge per
cycle is for a power loss of
If D BST is tied to the output, then the charge drawn from
the output capacitor will still be . The energy loss
due to base charge per cycle is for a power
? 2005 Semtech Corp.
14
www.semtech.com
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| SC2441 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441A | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441A_09 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441AEVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441ATETRT | 制造商:Semtech Corporation 功能描述: |
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