参数资料
型号: MAX5068EAUE+T
厂商: Maxim Integrated Products
文件页数: 11/20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: 2,500
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: 带卷 (TR)
High-Frequency, Current-Mode PWM Controller
with Accurate Programmable Oscillator
V IN
MAX5068C/E
R6
UVLO/EN
1.23V
1.18V
R7
V HYST = V ON - V OFF
V OFF
V ON
Figure 2. Setting the MAX5068C/E Undervoltage Lockout
Threshold
MAX5068A/B/D/F UVLO with
Programmable Hysteresis
In addition to programmable undervoltage lockout dur-
ing startup, the MAX5068A/B/D/F incorporate a
Figure 3. MAX5068 Hysteresis
V IN
UVLO/EN hysteresis that allows the user to set a volt-
age (V OFF ) to disable the controller (see Figure 3).
At the beginning of the startup sequence, UVLO/EN is
MAX5068A/B/D/F
UVLO/EN
R6
below the 1.23V threshold, Q1 turns on connecting
R HYST to GND (Figure 4). Once the UVLO 1.23V thresh-
old is crossed, Q1 turns off, resulting in the series com-
bination of R6, R HYST , and R7, placing the MAX5068 in
normal operating condition.
1.23V
1.18V
Q1
HYST
R HYST
R7
Calculate the turn-on voltage (V ON ) by using the fol-
lowing formula:
R 6 = ?
? 1 ? × R HYST
? V ON
? V ULR 2
?
?
R 7 = R 6 / ? OFF ? 1 ? ? R HYST
where V ULR2 is the UVLO/EN’s 1.23V rising threshold.
Choose an R HYST value in the 20k ? range.
The MAX5068 turns off when the MAX5068 UVLO/EN
falls below the 1.18V falling threshold. The turn-off volt-
age (V OFF ) is then defined as:
? V ?
? V ULF 2 ?
where V ULF2 is the 1.18V UVLO/EN falling threshold.
Figure 4. Setting the MAX5068A/B/D/F Turn-On/Turn-Off Voltages
Bootstrap Undervoltage Lockout
(MAX5068A/C/D Only)
In addition to the externally programmable UVLO func-
tion offered by the MAX5068, the MAX5068A/C/D fea-
ture an additional internal bootstrap UVLO for use in
high-voltage power supplies (see the Functional
Diagram ). This allows the device to bootstrap itself dur-
ing initial power-up. The MAX5068A/C/D start when V IN
exceeds the bootstrap UVLO threshold of 23.6V.
______________________________________________________________________________________
11
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MAX5068FAUE+ 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
MAX5068FAUE+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
MAX5068FAUE-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
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