参数资料
型号: MAX15005BAUE/V+
厂商: Maxim Integrated Products
文件页数: 16/27页
文件大小: 0K
描述: IC REG CTRLR PWM CM 16-TSSOP
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 96
PWM 型: 电流模式
输出数: 1
频率 - 最大: 1MHz
占空比: 81.5%
电源电压: 4.5 V ~ 40 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 16-TSSOP(0.173",4.40mm 宽)
包装: 管件
MAX15004A/B/MAX15005A/B
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC Power-Supply Controllers
V IN
D VIN
C IN
RT
C REG5
0.1 μ F
13
REG5
1
IN
V CC
C VIN
1 μ F
16
R VCC
D VCC
L
D3
C OUT
V OUT
18V
C VCC
4.7 μ F
6
RTCT
CT
MAX15004A/B
OUT
15
Q
MAX15005A/B
C FF
RF
CF
11
COMP
CS
12
C CS
R CS
RS
RA
10
FB
SLOPE
4
C SLOPE
SS
9
C SS
PGND
RB
Figure 5. Application Schematic
Input Capacitor Selection in Boost Configuration
The input current for the boost converter is continuous
and the RMS ripple current at the input capacitor is low.
Calculate the minimum input capacitor value and maxi-
mum ESR using the following equations:
capacitor discharge and Δ V ESR is the contribution due
to ESR of the capacitor. Assume the input capacitor rip-
ple contribution due to ESR ( Δ V ESR ) and capacitor dis-
charge ( Δ V Q ) is equal when using a combination of
ceramic and aluminum capacitors. During the convert-
er turn-on, a large current is drawn from the input
where:
C IN =
ESR =
Δ I L =
Δ I L × D
4 × f OUT × Δ V Q
Δ V ESR
Δ I L
(V IN ? V DS ) × D
L × f OUT
source especially at high output to input differential.
The MAX15004/MAX15005 are provided with a pro-
grammable soft-start, however, a large storage capaci-
tor at the input may be necessary to avoid chattering
due to finite hysteresis.
Output Capacitor Selection in Boost Configuration
For the boost converter, the output capacitor supplies
the load current when the main switch is on. The
required output capacitance is high, especially at higher
duty cycles. Also, the output capacitor ESR needs to be
V DS is the total voltage drop across the external MOS-
FET plus the voltage drop across the inductor ESR. Δ I L
is peak-to-peak inductor ripple current as calculated
above. Δ V Q is the portion of input ripple due to the
16
low enough to minimize the voltage drop due to the ESR
while supporting the load current. Use the following
equations to calculate the output capacitor, for a speci-
fied output ripple. All ripple values are peak-to-peak.
Maxim Integrated
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