参数资料
型号: MAX5068CAUE+
厂商: Maxim Integrated Products
文件页数: 13/20页
文件大小: 0K
描述: IC REG CTRLR FLYBK ISO 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: 1.25MHz
占空比: 75%
电源电压: 10.8 V ~ 24 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)裸露焊盘
包装: 管件
High-Frequency, Current-Mode PWM Controller
with Accurate Programmable Oscillator
V IN
D2
D1
VOUT
C7
R2
C1
R1
IN
C2
NDRV
Q1
C3
FLTINT
CS
R11
V CC
MAX5068A
FB
R CS
C6
C4
R3
REG5
COMP
R5
C5
R6
V CC
RT
R4
DT
SYNC
UVLO/EN
HYST
R HYST
R9
PS2913
MAX8515
C10
R12
AGND
PGND
R7
R8
R10
R13
Figure 6. Secondary-Side, Regulated, Isolated Power Supply
Assuming C1 > C3, calculate the value of R1 as follows:
To minimize power loss on this resistor, choose a high-
er value for R1 than the one calculated above (if a
I C 1 =
R 1 ?
V SUVR × C 1
500 ms
V IN ( MIN ) ? 0 . 5 x V SUVR
I C 1 + I START
longer startup time can be tolerated).
The above startup method is applicable to a circuit sim-
ilar to the one shown in Figure 1. In this circuit, the ter-
tiary winding has the same phase as the output
windings. Thus, the voltage on the tertiary winding at
where V SUVR is the bootstrap UVLO wakeup level
(23.6V max), V IN(MIN) is the minimum input supply volt-
age for the application (36V for telecom), and I START is
the V IN supply current at startup (90μA, max).
For example:
any given time is proportional to the output voltage and
goes through the same soft-start period as the output
voltage. The minimum discharge time of C1 from 22V to
10V must be greater than the soft-start time (t SS ).
Oscillator/Switching Frequency
Use an external resistor at RT to program the MAX5068
I C1 =
R 1 ?
24 V x 2 . 2 μ F
500 ms
36 V ? 12 V
106 μ A + 90 μ A
= 106 μ A
= 122 . 4 k ?
internal oscillator frequency from 50kHz to 2.5MHz. The
MAX5068A/B output switching frequency is one-half of
the programmed oscillator frequency with a 50% duty
cycle. The MAX5068C/D/E/F output switching frequen-
cy is one-quarter of the programmed oscillator frequen-
cy with a 75% duty cycle.
______________________________________________________________________________________
13
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相关代理商/技术参数
参数描述
MAX5068CAUE+ 功能描述:电流型 PWM 控制器 High-Frequency Current-Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX5068CAUE+T 功能描述:电流型 PWM 控制器 High-Frequency Current-Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX5068CAUE-T 功能描述:电流型 PWM 控制器 High-Frequency Current-Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX5068CWP 制造商:Maxim Integrated Products 功能描述:
MAX5068DAUE 功能描述:电流型 PWM 控制器 High-Frequency Current-Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14