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参数资料
| 型号： | MAX5069EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX5069 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，隔离 |
| 输出电压： | 12V |
| 电流 - 输出： | 10A |
| 输入电压： | 36 ~ 72V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX5069 |
High-Frequency, Current-Mode PWM Controller
with Accurate Oscillator and Dual FET Drivers
V IN
MAX5069A/D
R6
UVLO/EN
V HYST = V ON - V OFF
R7
1.23V
1.18V
V OFF
V ON
Figure 2. Setting the MAX5069A/D Undervoltage Lockout
Threshold
hysteresis that allows the user to set a voltage (V OFF ) to
disable the controller (see Figure 3).
At the beginning of the startup sequence, UVLO/EN is
Figure 3. MAX5069 Hysteresis
V IN
below the 1.23V threshold, and 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 MAX5069 in
MAX5069B/C
UVLO/EN
R6
normal operating condition.
Calculate the turn-on voltage (V ON ) by using the fol-
lowing formula:
1.23V
1.18V
HYST
R HYST
R 6 = ?
? 1 ? × R HYST
? V ON
? V ULR 2
?
?
Q1
R7
where V ULR2 is the UVLO/EN’s 1.23V rising threshold.
Choose an R HYST value in the 20k ? range.
The MAX5069 turns off when the MAX5069 UVLO/EN
R 7 = R 6 / ? OFF ? 1 ? ? R HYST
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.
Bootstrap Undervoltage Lockout
(MAX5069A/B)
In addition to the externally programmable UVLO func-
tion offered by the MAX5069, the MAX5069A/B feature
an additional internal bootstrap UVLO for use in high-
voltage power supplies (see the Functional Diagram ).
This allows the device to bootstrap itself during initial
Figure 4. Setting the MAX5069B/C Turn-On/Turn-Off Voltages
power-up. The MAX5069A/B start when V IN exceeds
the bootstrap UVLO threshold of 23.6V.
During startup, the UVLO circuit keeps the PWM com-
parator, ILIM comparator, oscillator, and output drivers
shut down to reduce current consumption. Once V IN
reaches 23.6V, the UVLO circuit turns on both the PWM
and ILIM comparators, as well as the oscillator, and
allows the output driver to switch. If V IN drops below
9.7V, the UVLO circuit shuts down the PWM compara-
tor, ILIM comparator, oscillator, and output drivers,
returning the MAX5069A/B to the startup mode.
______________________________________________________________________________________
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相关代理商/技术参数 |
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| MAX506ACWP+T | 功能描述:数模转换器- DAC 8-Bit 4Ch Precision DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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