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参数资料
| 型号： | SC4501MSETRT |
| 厂商： | Semtech |
| 文件页数： | 13/21页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 2A 8MSOP |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 32V |
| 输入电压： | 1.4 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.5MHz |
| 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-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-MSOP-EP |
| 其它名称： | SC4501MSEDKR |
SC4501
POWER MANAGEMENT
Application Information
The turn off voltage is:
V L = V H ? V HYS = 2 . 75 ? 0 . 69 = 2 . 06 V > 1 . 4 V .
IN
6/8
Frequency Compensation
R3
I HYS
4.6 μ A
SWITCH CLOSED
WHEN Y = “1”
Figure 8 shows the equivalent circuit of a boost converter
using the SC4501. The output filter capacitor and the load
form an output pole at frequency:
SHDN
3
+
Y
ω p 2 = ?
2 I OUT
V OUT C 2
= ?
2
R OUT C 2
(13)
R4
1.1V
-
COMPARATOR
where C 2 is the output capacitor and R OUT =
V OUT
I OUT
is the
SC4501
Figure 7. Programmable Hysteretic UVLO Circuit
with V L > 1 . 4 V .
equivalent load resistance.
The zero formed by C 2 and its equivalent series resistance
(ESR) is neglected due to low ESR of the ceramic output
capacitor.
There is also a right half plane (RHP) zero at angular
frequency:
Example: Increase the turn on voltage of a V IN = 3.3V boost
converter from 1.4V to 2.75V.
Using V H = 2.75V and R 4 = 100K Ω in (12),
ω Z 2 =
R OUT ( 1 ? D ) 2
L
(14)
R 3 = 150 K Ω .
The resulting UVLO hysteresis is:
ω z2 decreases with increasing duty cycle D and increasing
I OUT . Using the 5V to 12V boost regulator (1.35MHz) in
Figure 1(a) as an example,
V HYS = I HYS R 3 = 4 . 6 μ A ? 150 K Ω = 0 . 69 V .
R OUT ≥
5 V
0 . 74 A
= 6 . 8 Ω
IN
V
POWER
STAGE
I
OUT
VOUT
C5
R1
ESR
R OUT
C2
COMP
Gm
-
FB
+
C6
R3
RO
1.242V
R2
C4
VOLTAGE
REFERENCE
Figure 8. Simplified Block Diagram of a Boost Converter
2011
? 2005 Semtech Corp.
13
www.semtech.com
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