参数资料
| 型号： | SC4524SETRT |
| 厂商： | Semtech |
| 文件页数： | 15/21页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 2A 8SOIC |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出数： | 1 |
| 输入电压： | 2.8 V ~ 30 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-SOIC-EP |
| 产品目录页面： | 1358 (CN2011-ZH PDF) |
| 其它名称： | SC4524SEDKR |
SC4524
POWER MANAGEMENT
Applications Information
start voltage ramp at the SS pin clamps the error amplifier
output (Figure 2). During regulator start-up, COMP voltage
follows the SS voltage. The converter starts to switch
when its COMP voltage exceeds 1.1V. The peak inductor
current gradually increases until the converter output
comes into regulation. Proper soft-start prevents output
overshoot during start-up. Current drawn from the input
supply is also well controlled. Notice that the inductor
current, not the converter output voltage, is ramped
during soft-start.
The soft-start capacitor is charged to a final voltage of
about 2.4V.
2.4V
2V
Overload / Short-Circuit Protection
The current limit comparator in the SC4524 limits the
peak inductor current to 3.2A (typical). The regulator
output voltage will fall if the load is increased above the
current limit. If overload is detected (the output voltage
falls below 70% of the set voltage), then the regulator
will be shut off. An internal 0.8μA current sink starts to
discharge the soft-start capacitor. As the soft-start
capacitor is discharged below 1V, the discharge current
source turns off and the soft-start capacitor is recharged
with a 1.8μA current source. The regulator undergoes
soft-start. During soft-start (1V < V SS < 2V), the overload
shutdown latch in Figure 3 cannot be set. When V SS
exceeds 2V, the set input of the overload latch is no
VSS
Hiccup
Enabled
1V
0.3V
0
Fast
Charge
VFB
1V
0.7V
Switching Starts
0
2V
1V
0.3V
VSS
Output must be at
least 70% of its set
voltage in this
interval or the
regulator will
undergo shutdown
and restart
(hiccup).
VCOMP
Figure 9(a). Normal Soft-start.
0
Switching
Not Switching
Switching
Not Switching
1V
0.7V
VFB
0
Figure 9(b).
Start-up Fails due to (i) Short Soft-start Duration or (ii) Output Overload or (iii)
Output Short-circuited.
? 2006 Semtech Corp.
15
www.semtech.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC4525A | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:28V 3A Step-Down Switching Regulator |
| SC4525AEVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:28V 3A Step-Down Switching Regulator |
| SC4525ASETRT | 功能描述:IC REG BUCK 3A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| SC4525C | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:28V 3A Step-Down Switching Regulator Thermal Shutdown |
| SC4525CSETRT | 功能描述:IC REG BUCK ADJ 3A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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