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參數(shù)資料
| 型號： | LM5041BSDX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 685 kHz SWITCHING FREQ-MAX, DSO16 |
| 封裝： | 5 X 5 MM, LLP-16 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 426K |
| 代理商： | LM5041BSDX |
Slope Compensation
The PWM comparator compares the current sense signal to
the voltage at the COMP pin. The output stage of the internal
error amplifier generally drives the COMP pin. At duty cycles
greater than 50%, current mode control circuits are subject to
sub-harmonic oscillation. By adding an additional fixed ramp
signal (slope compensation) to the current sense ramp, os-
cillations can be avoided. The LM5041B integrates this slope
compensation by buffering the internal oscillator ramp and
summing a current ramp generated by the oscillator internally
with the current sense signal. Additional slope compensation
may be provided by increasing the source impedance of the
current sense signal.
Soft-Start and Shutdown
The soft-start feature allows the power converter to gradually
reach the initial steady state operating point, thereby reducing
start-up stresses and surges. At power on, a 10 A current is
sourced out of the soft-start pin (SS) to charge an external
capacitor. The capacitor voltage will ramp up slowly and will
limit the maximum duty cycle of the buck stage. In the event
of a fault as indicated by V
CC Under-voltage, line Under-volt-
age the output drivers are disabled and the soft-start capacitor
is discharged to 0.7V. When the fault condition is no longer
present, a soft-start sequence will begin again and buck stage
duty cycle will gradually increase as the soft-start capacitor is
charged.
The SS pin also serves as an enable input of HD and LD. Both
HD and LD will be forced to a low state if the SS pin is below
the shutdown threshold of 0.45V.
Thermal Protection
Internal Thermal Shutdown circuitry is provided to protect the
integrated circuit in the event that the maximum junction tem-
perature is exceeded. When activated, typically at 165 de-
grees Celsius, the controller is forced into a low-power
standby state, disabling the output drivers and the bias regu-
lator. This feature is provided to prevent catastrophic failures
from accidental device overheating.
Differences Between LM5041,
LM5041A and LM5041B
There are five differences between LM5041, LM5041A and
LM5041B. In the LM5041A and the LM5041B versions, the
hiccup mode over-current protection is not employed and the
VCC bias regulator is not disabled by SS pin shutdown state.
In the LM5041B version, both HD and LD will be low state
when the PWM controller disabled. In the LM5041 and the
LM5041B version, PWM controller is disabled by either a UV-
LO pin low state or SS pin shutdown state. Also in the
LM5041B version, the REF pin output is not disabled by a
UVLO pin low state. However, if VCC does not receive power
from an external source, the UVLO pin low state will disable
the internal VCC regulator and a VCC under-voltage condition
will eventually disable REF as the VCC voltage falls.
Differences Between LM5041, LM5041A and LM5041B
ITEM
LM5041
LM5041A
LM5041B
Hiccup mode over-current protection
Available
N/A
VCC disabled by SS shutdown
Yes
No
REF disabled by UVLO pin low state
Yes
No
BUCK controller disabled by SS shutdown
Yes
No
Yes
BUCK driver states when the controller disabled
HD : LOW
LD :HIGH
HD : LOW
LD : HIGH
HD : LOW
LD : LOW
Logic Table
MODE
CONTROLS
DEVICE
PIN STATES
UVLO
SS
VCC
REF
HD
LD
PUSH&PULL
Normal
Operation
HIGH
-
LM5041
9V
5V
PWM
50% Duty Cycle
LM5041A
LM5041B
UVLO
Shutdown
LOW
-
LM5041
GND
LOW
HIGH
LOW
LM5041A
LM5041B
LOW
SS
Shutdown
HIGH
LOW
LM5041
GND
LOW
HIGH
LOW
LM5041A
9V
5V
50% Duty Cycle
LM5041B
LOW
11
www.national.com
LM5041B
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM5041EVAL | 功能描述:BOARD EVALUATION LM5041 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:PowerWise® 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結(jié)構(gòu):升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM5041EVAL/NOPB | 功能描述:電源管理IC開發(fā)工具 LM5041 EVAL BOARD 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 |
| LM5041MTC | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關頻率: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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| LM5041MTC | 制造商:Texas Instruments 功能描述:PWM CONTROLLER POWERWISE TSSOP16 |
| LM5041MTC/NOPB | 功能描述:電流型 PWM 控制器 Cascaded Pwm Controller RoHS:否 制造商:Texas Instruments 開關頻率: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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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