LT1424IS8-9#TR Linear Technology, LT1424IS8-9#TR Datasheet
LT1424IS8-9#TR
Specifications of LT1424IS8-9#TR
Available stocks
Related parts for LT1424IS8-9#TR
LT1424IS8-9#TR Summary of contents
Page 1
... Load compensation circuitry allows for improved load regula- tion. An externally activated shutdown mode reduces total supply current typical for standby operation. , LTC and LT are registered trademarks of Linear Technology Corporation. – 9V PCMCIA Type II Isolated LAN Supply (2.41mm Maximum Component Height) D1 ...
Page 2
... Duty Cycle = Minimum U W INFORMATION ORDER PART NUMBER TOP VIEW 8 R CCOMP LT1424CN8 LT1424CS8 LT1424IN8-9 5 PGND LT1424IS8-9 S8 PACKAGE S8 PART MARKING 8-LEAD PLASTIC SO = 130 C/ W (N) JA 14249 = 110 C/ W (S) JA 1424I9 = 1.4V, unless otherwise specified. C MIN TYP MAX 2.8 3.1 7.0 9 0.3 ...
Page 3
ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER Timing f Switching Frequency t Minimum Switch ON Time ON t Flyback Enable Delay Time ED t Minimum Flyback Enable Time EN Maximum Switch Duty Cycle Load Compensation V ...
Page 4
LT1424 TYPICAL PERFOR A CE CHARACTERISTICS Switch Saturation Voltage vs Switch Current 1.2 1.0 125 C 0 0.6 –55 C 0.4 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 SWITCH CURRENT (A) 1424-9 G01 ...
Page 5
W U TYPICAL PERFOR A CE CHARACTERISTICS Minimum Switch On Time vs Temperature 275 250 225 200 175 150 125 100 – 100 125 – TEMPERATURE ( C) 1424-9 G10 PIN ...
Page 6
LT1424-9 W BLOCK DIAGRAM V IN 2.6V SHDN REGULATOR 285kHz SYNC OSCILLATOR W FLYBACK ERROR A PLIFIER DIAGRA FLYBACK ERROR AMPLIFIER LOGIC COMPENSATION COMP SGND V C GND IS OMITTED FOR CLARITY ...
Page 7
DIAGRA V SW VOLTAGE V IN GND SWITCH OFF STATE MINIMUM t ON FLYBACK AMP STATE ON OFF ENABLE DELAY DISABLED MINIMUM ENABLE TIME LT1424-9 COLLAPSE DETECT V FLBK 0.80 V FLBK ON ENABLED ...
Page 8
LT1424-9 U OPERATION The LT1424 current mode switching regulator IC that has been designed specifically for the isolated fly- back topology. The special problem normally encoun- tered in such circuits is that information relating to the output voltage ...
Page 9
U OPERATION Combination with the previous V FLBK expression for terms of the internal reference, OUT programming resistors, transformer turns ratio and diode forward voltage drop – V OUT BG ...
Page 10
LT1424-9 U OPERATION time. Certain parameters of flyback amp behavior will then be directly affected by the variable enable period. These include effective transconductance and V LOAD COMPENSATION THEORY The LT1424-9 uses the flyback pulse to obtain information about the ...
Page 11
U OPERATION V RCCOMP = Data sheet value for action vs switch current R = External “feedback” resistor value Uncompensated output impedance OUT U U APPLICATIONS INFORMATION The LT1424 application-specific 8-pin part ...
Page 12
LT1424 APPLICATIONS INFORMATION MINIMUM LOAD CONSIDERATIONS The LT1424-9 generally provides better low load perfor- mance than previous generation switcher/controllers utilizing indirect output voltage sensing techniques. Spe- cifically, it contains circuitry to detect flyback pulse “collapse,” thereby supporting operation ...
Page 13
U U APPLICATIONS INFORMATION Total power dissipation of the die is the sum of supply current times supply voltage plus switch power • D(TOTAL FREQUENCY COMPENSATION Loop frequency compensation is ...
Page 14
LT1424-9 PACKAGE DESCRIPTION 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) +0.035 0.325 –0.015 +0.889 8.255 –0.381 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) ...
Page 15
... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...
Page 16
... General Purpose with External Application Resistors C6 ISOLATION R2 220pF BARRIER 75 MBRS130LT3 R1 OUT 75 COM 1. 25V 25V 2 4 –9V 200mA 1424 TA01 1:1 CAPACITOR, SIZE 1812. (847) 696-2000 T1: COILTRONICS CTX02-13483 I EFFICIENCY OUT 200mA 70% sn14249 14249fs LT/TP 0599 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1998 ...