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參數(shù)資料
| 型號： | 2SC5668-T1FB |
| 元件分類： | 小信號晶體管 |
| 英文描述： | L BAND, Si, NPN, RF SMALL SIGNAL TRANSISTOR |
| 封裝： | ULTRA SUPER MINIMOLD PACKAGE-3 |
| 文件頁數(shù)： | 2/18頁 |
| 文件大?。?/td> | 87K |
| 代理商： | 2SC5668-T1FB |
Current Limit 3.3V
OUT@ 25°C
30114654
Current Limit 3.3V
OUT@ 85°C
30114668
Application Block Diagram
30114608
COT Control Circuit Overview
Constant On Time control is based on a comparator and an
on-time one shot, with the output voltage feedback compared
with an internal 0.8V reference. If the feedback voltage is be-
low the reference, the main MOSFET is turned on for a fixed
on-time determined by a programming resistor R
ON. RON is
connected to V
IN such that on-time is reduced with increasing
input supply voltage. Following this on-time, the main MOS-
FET remains off for a minimum of 260 ns. If the voltage on the
feedback pin falls below the reference level again the on-time
cycle is repeated. Regulation is achieved in this manner.
Design Steps for the LMZ14201
Application
The LMZ14201 is fully supported by Webench and offers
the following: Component selection, electrical and thermal
simulations as well as the build-it board for a reduction in de-
sign time. The following list of steps can be used to manually
design the LMZ14201 application.
Select minimum operating V
IN with enable divider resistors
Program V
O with divider resistor selection
Program turn-on time with soft-start capacitor selection
Select C
O
Select C
IN
Set operating frequency with R
ON
Determine module dissipation
Layout PCB for required thermal performance
ENABLE DIVIDER, R
ENT AND RENB SELECTION
The enable input provides a precise 1.18V band-gap rising
threshold to allow direct logic drive or connection to a voltage
divider from a higher enable voltage such as V
IN. The enable
input also incorporates 90 mV (typ) of hysteresis resulting in
a falling threshold of 1.09V. The maximum recommended
voltage into the EN pin is 6.5V. For applications where the
midpoint of the enable divider exceeds 6.5V, a small zener
can be added to limit this voltage.
The function of this resistive divider is to allow the designer to
choose an input voltage below which the circuit will be dis-
www.national.com
10
LMZ14201
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 2SC5668-T1FB-A | L BAND, Si, NPN, RF SMALL SIGNAL TRANSISTOR |
| 2SC5674-T3FB-A | S BAND, Si, NPN, RF SMALL SIGNAL TRANSISTOR |
| 2SC5674-T3FB | S BAND, Si, NPN, RF SMALL SIGNAL TRANSISTOR |
| 2SC5674-T3FB-A | S BAND, Si, NPN, RF SMALL SIGNAL TRANSISTOR |
| 2SC5674-FB-A | S BAND, Si, NPN, RF SMALL SIGNAL TRANSISTOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 2SC5669 | 制造商:SANYO 功能描述:NPN 230V 15A 60 to 160 TO-3PB Bulk 制造商:SANYO Semiconductor Co Ltd 功能描述:TRANSISTOR NPN 230V 15A TO-247 制造商:SANYO Semiconductor Co Ltd 功能描述:NPN 230V 15A 140W 262010 Sanyo Transistor TO-247Var 制造商:Sanyo 功能描述:Trans GP BJT NPN 230V 15A 3-Pin(3+Tab) TO-3PB |
| 2SC5674-T3-A-FB | 制造商:Renesas Electronics Corporation 功能描述: |
| 2SC5676-FB(T1) | 制造商:Renesas Electronics Corporation 功能描述: |
| 2SC5682 | 制造商:Sanyo Fisher 功能描述:800V 20A 95W Bce Sanyo Transistor TO-3Pmlh |
| 2SC5686000LK | 制造商:Panasonic Industrial Company 功能描述:TRANSISTOR |
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