参数资料
型号: SC4525CSETRT
厂商: Semtech
文件页数: 13/22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 ~ 26.88 V
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: 3A
同步整流器:
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: SC4525CSEDKR
SC4525C
Applications Information (Cont.)
D1
Substituting the first equation into the second equation,
VIN
IN
BST
SC4525C
SW
GND
D
2
C1
3V < V O < 8V
where V SS is the soft-start capacitor voltage and I SS is the
soft-start charging current. V   is the voltage defined in
Figure 2.
(a)
To ensure successful startup, the total current drawn
from the output must be less than the maximum output
D3
D1
capability of the part,
VIN
IN
BST
SC4525C
SW
C1
V O < 2.5V
GND
D
2
Substituting the third equation of this section into the
previous equation,
(b)
D1
VIN
BST
SC4525C
C1
2.5V < V O < 3V
or V O > 8V
Rearranging,
IN
GND
SW
(C)
D2
Figures 6 — Methods of Bootstrapping the SC4525C
Minimum Soft-start Capacitance CSS
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.
Therefore the minimum C SS depends on the output
capacitance and the load current. Larger C SS is necessary
when starting into a heavy load (small R). If V IN rise time
exceeds  00ms, then a larger C SS may be necessary
to produce a monotonic rising output. Always verify
converter start-up on the bench.
 3
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