damage to the device; this comprises current limiting, power limiting ... General Description ... output current so as to reduce power dissipation and prevent.
L200 Adjustable Voltage / Current Regulator Features: • Adjustable output current • Adjustable output voltage • Low quiescent current • Short circuit protection • Ther mal overload protection
Pin out diagram as shown in module 8064
Suggested applications: • Power supplies • Battery chargers • DC - DC converters IInnttrroodduuccttiioonn The L200 is a monolithic IC designed for programmable voltage and current regulation. Voltage outputs between 2.85V and 36V may be accommodated, at currents of up to 2A. The device is supplied in a 5-pin package (see pin-out diagram). The L200 has internal protection to minimise the possibility of damage to the device; this comprises current limiting, power limiting, thermal shutdown and input over-voltage protection (up to 60V for 10mS). G Geenneerraall D Deessccrriippttiioonn The L200 uses a relatively sophisticated design and may be used in several different configurations to provide voltage or current regulation. Current limiting is controlled by connecting a resistor between pin 2 and pin 5 of the L200. The current limit threshold is approximated by the expression: I o – Vsc / Rsc Where I o = Output current (A) Vsc = Current limit sense voltage (V) Rsc = Resistance between pin 5 and pin 2 (¿) The current limit sense voltage is variable depending on several factors including load and temperature but is typically 0.45V. Power dissipation is controlled by the internal safe operating area (SOA) protection circuitry of the L200. The device can supply a current of up to 2A as long as the input / output differential voltage is less than 20V. With differential voltages above 20V, the maximum current output drops considerably; if this value is exceeded then the SOA protection limits the output current so as to reduce power dissipation and prevent damage to the device. Output voltage is determined by the value of the resistors connected between pin 3 & pin 4 and pin 4 & pin 2 of the device. The final output voltage can be approximated by the expression:
C Coonnnneeccttiioonn iinnffoorrm maattiioonn:: Input connections are made to P1 (input +V) and P2 (input 0V). Output connections are made to P8 (output +V) and P9 (0V). Output voltage is controlled via RV1, however an external potentiometer may be connected to P3, P4 & P5. If the external control is used then RV1 should NOT be fitted. If a fixed output is required, then a fixed value resistor may be connectred between P3 & P4 – again RV1 should NOT be fitted. The current limit threshold of the circuit is set by resistors R2 & R3. Provision is also provided for an external current limiting resistor which may be connected between P6 & P7. A low value variable resistor may be used for variable current limit control but at higher current levels, the resolution will become increasingly poor. The approximate current limit threshold may be calculated using the following method, assuming a typical voltage of 0.45V between P6 & P7 (pin 5 and pin 2 of the IC): I o = 0.45 / Rsc Where Io is the output current and Rsc is the total parallel resistance between P6 & P7 (R2, R3 and any external current limit resistor in parallel) in ohms.
Vo = Vref (1+(R2 / R1)) Where: Vo = Output Voltage (V) Vref = Reference voltage on pin 4 (V) R1 = Resistance between pin 4 & pin 3 (¿) R2 = Resistance between pin 2 & pin 4 (¿). For the purpose of approximate calculation, Vref may be taken at a typical value of 2.77V although in practice this figure may vary slightly. H Heeaattssiinnkk At higher power levels, it is necessary to use a suitable heatsink to prevent the L200 from reaching excessive temperatures. The type of heatsink used is dependable on the individual application. In some cases, a large area of metal such as the side of an enclosure may already be available. The tab of the L200 is at 0V potential an will bolt directly to a heatsink if this is also at 0V potential; however, in some cas es it may be necessary to isolate the tab of the L200.
A datasheet for the L200 is available from Maplin. L200 Application Parts List Resistors: All 0.6W 1% Metal film (unless specified) R1 820¿ 1 (M820R) R2 See Text 1 R3 See Text 1 R4 4K7 1 (M4K7) RV1 Ver Encl Preset 10K 1 (UH16S) Capacitors C1 Monores Cap 100nF C2 PC Elect 470uF 35V
The resistor RL limits the reverse currents through ther regulator (which should be 100 mA max) when the bat- tery is accidentally reverse connected. If RL is in ...Missing:
This simple Linear circuit provides continuously variable regulated current (~25-400mA) from a ... lamp with halogen bulb (and spare) with Willy Hunt's microcontroller switching voltage regulator (not suitable for LED's) ... perfect temperature.
30Lead Plastic Small Outline Transistor Header (MB) [SOT089]. Notes: 1. Dimensions D and E do not include mold flash or protrusions. Mold flash or protrusions ...
Prevent dust, sand and water from getting into switches. â On toggle versions, also prevent ice from blocking lever action. â Compatible with frontal sealing ...
... means graphic, electronic or mechanical, including photocopying, recording, taping or information storage and retrieval systems without the written permission ...
n ±15V tracking outputs n Output current to 100 mA n Output voltage balanced to within 2% n Line and load regulation of 0.06% n Internal thermal overload ...
Turn T handle adjusting screw clockwise to increase vacuum or pressure, or counter clockwise to decrease vacuum or pressure. When decreasing vacuum or ...
have perfectly serviceable tungsten filament lamps, it's not .... t (W. ) Efficiency and Light Output vs. Input Voltage (Data Supplied by Manufacturer). Nova 5 only.
Mar 1, 2001 - UIS conference on cave radio and electronics - Report on the 1997 meeting in ..... Graham NAYLOR, a physicist at the European Synchrotron in ..... La solution est donc d'utiliser les bas voltages tout en diminuant le plus ...
Originally it was more a question of expressing a fit of temper in front of ... answered me by offering to perform a series of tests on the Petzl helmets currently ..... Following reflection on helmets (see history at the end of email), I would ... L
on digital logic cards eliminating the distribution problems association with single-point regulation The devices are available in two standard transistor packages ...
and/or vacuum adjustment range. A foam filter provides protection to the internal valve and system components. Operation. Vacuum created by the air pump ...
of 200 mA if adequate heat sinking is provided With the. TO-3 power package the available output current is greater than 1A. The regulators are essentially ...
Vacuum created by the air pump enters the valve cen- ter body, then bleeds through the diaphragm orifice to the top of the diaphragm. The outer bottom portion ...
Entfernen Sie den vorhandenen Schlauch und Regler vom Grill. Verwijder ... Place hose and regulator onto the valve or manifold connection. Aseta letku ja ...
Symbol. Conditions. Min. Typ. Max. Unit. Line Regulation. âVO. VI = 12V to 15V. VI = 12V to 40V. -. 0.01. 0.1. 0.1. 0.5. %. TMIN â¤TAâ¤TMAX. VI = 12V to 15V.
