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參數(shù)資料
| 型號： | MAX5069D |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Frequency, Current-Mode PWM Controller with Accurate Oscillator and Dual FET Drivers |
| 中文描述： | 高頻率，電流模式PWM控制器，具有精確的振蕩器和雙FET驅(qū)動器 |
| 文件頁數(shù)： | 11/19頁 |
| 文件大?。?/td> | 236K |
| 代理商： | MAX5069D |
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
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
normal operating condition.
Calculate the turn-on voltage (V
ON
) by using the fol-
lowing formula:
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
falls below the 1.18V falling threshold. The turn-off volt-
age (V
OFF
) is then defined as:
where V
ULF2
is the 1.18V UVLO/EN falling threshold.
Bootstrap Undervoltage Loc kout
(MAX 5069A/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
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.
R
R
V
V
R
OFF
ULF
HYST
7
6
1
2
/
=
R
V
V
R
ON
ULR
HYST
6
1
2
×
=
M
High-Frequenc y, Current-Mode PWM Controller
with Ac c urate Osc illator and Dual FET Drivers
______________________________________________________________________________________
11
MAX5069A/D
1.23V
1.18V
UVLO/EN
R7
R6
V
IN
Figure
2. Setting the MAX5069A/D Undervoltage Lockout
Threshold
V
HYST
= V
ON
- V
OFF
V
OFF
V
ON
Figure
3. MAX5069 Hysteresis
MAX5069B/C
1.23V
1.18V
UVLO/EN
HYST
R
HYST
R6
R7
V
IN
Q1
Figure
4. Setting the MAX5069B/C Turn-On/Turn-Off Voltages
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX5069DAUE | High-Frequency, Current-Mode PWM Controller with Accurate Oscillator and Dual FET Drivers |
| MAX5069CAUE | High-Frequency, Current-Mode PWM Controller with Accurate Oscillator and Dual FET Drivers |
| MAX5069A | MAX5069A Evaluation Kit |
| MAX5069AEVKIT | MAX5069A Evaluation Kit |
| MAX5075 | Push-Pull FET Driver with Integrated Oscillator and Clock Output |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5069DAUE | 功能描述:電流型 PWM 控制器 High-Frequency Current-Mode PWM RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX5069DAUE+ | 功能描述:電流型 PWM 控制器 High-Frequency Current-Mode PWM RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX5069DAUE+T | 功能描述:電流型 PWM 控制器 High-Frequency Current-Mode PWM RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX5069DAUE-T | 功能描述:電流型 PWM 控制器 High-Frequency Current-Mode PWM RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX5069EVKIT | 功能描述:電源管理IC開發(fā)工具 MAX5069 Eval Kit RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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