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参数资料
| 型号： | MAX1744EUB+T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | High-Voltage, Step-Down DC-DC Controller in µMAX |
| 中文描述： | SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | MICRO MAX PACKAGE-10 |
| 文件页数： | 14/14页 |
| 文件大小： | 256K |
| 代理商： | MAX1744EUB+T |
MAX1744/MAX1745
High-Voltage, Step-Down DC-DC
Controller in MAX
_______________________________________________________________________________________
9
At light output loads, the inductor current is discontinu-
ous, causing the MAX1744/MAX1745 to operate at
lower frequencies, reducing the MOSFET gate drive
and switching losses. In discontinuous mode, under
most circumstances, the on-time will be the fixed mini-
mum on-time of 1s. If the inductor value is small, or
the current-sense resistor large, the current limit will be
tripped before the minimum on-time, terminating the
on-time and thus setting the fixed on-time.
If the inductance is too large, or the output capacitance
high and equivalent series resistance (ESR) low, then
the MOSFET remains on longer than the minimum on-
time, until the output capacitor charges beyond the
error comparator’s (VOUT / 1.25V) 8mV hysteresis,
causing the part to operate in hysteretic mode.
Operating in hysteretic mode results in lower frequency
operation. The transition to hysteretic mode occurs at
the critical output capacitor ESR:
ESRCRITICAL = (VOUT / 1.25V) 8mV / IRIPPLE
where IRIPPLE is the inductor ripple current, and can be
determined by:
IRIPPLE = (VIN - VOUT) tON(MIN) / L
where tON(MIN) is the minimum on-time (1s) for mini-
mum on-time-control, or:
IRIPPLE = (VOUT) tOFF(MIN) / L
where tOFF(MIN) is the minimum off-time (2s) for mini-
mum off-time-control.
REF
MINIMUM
OFF-TIME
ONE SHOT
Q
TRIG
VL
LINEAR
REGULATOR
VH
LINEAR
REGULATOR
1.25
REFERENCE
(FB)
ERROR
COMPARATOR
OUT
3/5
SHDN
CS
100mV
+
-
Q
R
S
VL
SHDN
VH
EXT
IN
MINIMUM
ON-TIME
ONE SHOT
Q
TRIG
( ) MAX1745 ONLY
- - - MAX1744 ONLY
Figure 2. Simplified Functional Diagram
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1745AUB+T | High-Voltage, Step-Down DC-DC Controller in µMAX |
| MAX1745EUB+T | High-Voltage, Step-Down DC-DC Controller in µMAX |
| MAX1744AUB+ | High-Voltage, Step-Down DC-DC Controller in µMAX |
| MAX1744EUB+ | High-Voltage, Step-Down DC-DC Controller in µMAX |
| MAX1745AUB+ | High-Voltage, Step-Down DC-DC Controller in µMAX |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1744EVKIT | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX1744 MAX1745 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1745AUB | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1745AUB+ | 功能描述:DC/DC 开关控制器 Step-Down DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1745AUB+T | 功能描述:DC/DC 开关控制器 Step-Down DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1745AUB-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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