参数资料
| 型号： | SC4524ASETRT |
| 厂商： | Semtech |
| 文件页数： | 12/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 2A 8SOIC |
| 产品培训模块： | Power Supplies 101 |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出数： | 1 |
| 输入电压： | 3 V ~ 28 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 300kHz ~ 1.3MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 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： | SC4524ASEDKR |
Fig.5
Applications Information (Cont.)
SS270 REV 6-7
SC4524A
diodes should have an average forward current rating
at least 2A and a reverse blocking voltage of at least a
few volts higher than the input voltage. For switching
regulators operating at low duty cycles (i.e. low output
voltage to input voltage conversion ratios), it is beneficial
to use freewheeling diodes with somewhat higher
average current ratings (thus lower forward voltages). This
is because the diode conduction interval is much longer
than that of the transistor. Converter efficiency will be
improved if the voltage drop across the diode is lower.
2.2
2.1
2.0
1.9
1.8
1.7
Minimum Bootstrap Voltage
vs Temperature
I SW = -2.6A
Fig.6
The freewheeling diode should be placed close to the
SW pin of the SC4524A to minimize ringing due to trace
inductance. 20BQ030 (International Rectifier), B230A
(Diodes Inc.), SS 3, SS23 (Vishay), CMSH -40M, CMSH -
1.6
-50
-25
0 25 50 75
Temperature ( o C)
100 125
40ML and CMSH2-40M (Central-Semi.) are all suitable.
Figure 5. Typical Minimum Bootstrap Voltage required
The freewheeling diode should be placed close to the SW
pin of the SC4524A on the PCB to minimize ringing due to
to Saturate Transistor (I SW = -2.6A).
D1
D3
trace inductance.
BST
C1
Fig.6
Bootstrapping the Power Transistor
The typical minimum BST-SW voltage required to fully
VIN
IN
SW
SC4524A
GND
D2
VOUT
VIN
saturate the power transistor is shown in Figure 5, which
is about .96V at room temperature.
(a)
The BST-SW voltage is supplied by a bootstrap circuit
D1
D3
D1
converter (Figure 6). To maximize efficiency, tie the
C1
powered from either the input or the output of the
BST
BST
C1
bootstrap diode to the converter output if V O >2.5V. VOUT
Since the bootstrap supply current is proportional to the
converter load current, using a lower voltage D2 to power
the bootstrap circuit reduces driving loss and improves
VIN
IN SW
SC4524A
GND
VIN
IN
SW
SC4524A
GND
D
2
VOUT
efficiency.
(a)
For the bootstrap circuit, a fast switching PN diode (such
as N4 48 or N9 4) and a small (0. μF – 0.47μF) ceramic
capacitor is sufficient for most applications. When
bootstrapping from 2.5V to 3.0V output voltages, use a
low forward drop Schottky diode (BAT-54 or similar) for
D . When bootstrapping from high input voltages (>20V),
reduce the maximum BST voltage by connecting a Zener
diode (D 3 ) in series with D .
(b)
Figure 6. Methods of Bootstrapping the SC4524A
Loop Compensation
The goal of compensation is to shape the frequency
response of the converter so as to achieve high DC
accuracy and fast transient response while maintaining
loop stability.
2
相关PDF资料 |
PDF描述 |
|---|---|
| SC4524BSETRT | IC REG BUCK 2A 8SOIC |
| SC4524CSETRT | IC REG BUCK ADJ 2A 8SOIC |
| SC4524DSETRT | IC REG BUCK ADJ 2A 8SOIC |
| SC4524SETRT | IC REG BUCK 2A 8SOIC |
| SC4525ASETRT | IC REG BUCK 3A 8SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SC4524B | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:气门2A型降压型开关稳压器 |
| SC4524B_08 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:18V 2A Step-Down Switching Regulator |
| SC4524BEVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:18V 2A Step-Down Switching Regulator |
| SC4524BSETRT | 功能描述:IC REG BUCK 2A 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 |
| SC4524C | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:28V 2A Step-Down Switching Regulator Wide input range: 3V to 28V |
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