参数资料
| 型号： | SC4525DSETRT |
| 厂商： | Semtech |
| 文件页数： | 12/21页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 8SOIC |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1 V ~ 16.74 V |
| 输入电压： | 3 V ~ 18 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 65kHz ~ 350kHz |
| 电流 - 输出： | 3A |
| 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 |
| 其它名称： | SC4525DSEDKR |
SC4525D
Applications Information (Cont.)
The freewheeling diode should be placed close to the SW
pin of the SC4525D on the PCB to minimize ringing due to
trace inductance.
is less than 2.5V, then it will be necessary to bootstrap the
SC4525D from V IN (Figure 6(b)).
D1
Bootstrapping the Power Transistor
The minimum BST-SW voltage required to fully saturate
the power transistor is shown in Figure 5, which is about
2V at room temperature.
VIN
IN
BST
SC4525D
SW
C1
3V < V O < 8V
The BST-SW voltage is supplied by a bootstrap circuit
powered from either the input or the output of the
converter (Figures 6(a), 6(b) and 6(c)). To maximize
efficiency, tie the bootstrap diode to the converter output
if V O > 2.5V as shown in Figures 6(a) and 6(c). Since the
bootstrap supply current is proportional to the converter
load current, using a lower voltage to power the bootstrap
D1
GND
BST
(a)
D2
C1
circuit reduces driving loss and improves efficiency.
2.2
VIN
IN
SC4525D
SW
GND
D2
V O < 2.5V
2.1
(b)
2.0
D1
1.9
VIN
BST
SC4525D
C1
2.5V < V O < 3V
or V O > 8V
1.8
IN
GND
SW
D2
1.7
I SW =-3.9A
(C)
1.6
Temperature ( C)
-50
-25
0 25 50 75
o
100 125
Figure 6 — Methods of Bootstrapping the SC4525D
Minimum Soft-start Capacitance CSS
Figure 5 — Typical Minimum Bootstrap Voltage
required to Saturate the Transistor (I SW = -3.9A)
The bootstrap diode D can be a fast switching PN diode
( N4 48 or N9 4) if V O falls between 3V and 8V as shown
in Figure 6(a). If the converter output voltage is between
To ensure normal operation, the minimum soft-start
capacitance C SS can be calculated in terms of the output
capacitance C O and output load current I O according to
the following equations.
2.5V and 3V or higher than 8V, then use a low forward drop
Schottky diode (BAT54 or similar) for D (Figure 6(c)). If V O
2
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