LT1245IS8#PBF Linear Technology, LT1245IS8#PBF Datasheet
LT1245IS8#PBF
Specifications of LT1245IS8#PBF
Available stocks
Related parts for LT1245IS8#PBF
LT1245IS8#PBF Summary of contents
Page 1
... Trimmed Oscillator Frequency and Sink Current Active Pull-Down on Reference and Output During Undervoltage Lockout High Level Output Clamp: 18V Current Sense Leading Edge Blanking U O PPLICATI A S Off-Line Converters DC/DC Converters , LTC and LT are registered trademarks of Linear Technology Corporation. W BLOCK I D AGRA COMP 1 – ...
Page 2
LT1241 Series BSOLUTE Supply Voltage ........................................................ 25V Output Current ....................................................... 1A* Output Energy (Capacitive Load per Cycle) ...............5 J Analog Inputs (Pins 2, 3) ............................... – 0 Error Amplifier Output Sink ...
Page 3
ELECTRICAL C HARA TERISTICS C PARAMETER CONDITIONS Error Amplifier Section Output Voltage High Level V Output Voltage Low Level V Current Sense Section Gain Maximum Current Sense Input Threshold V Power Supply Rejection Ratio Input Bias Current Delay to Output ...
Page 4
LT1241 Series W U TYPICAL PERFOR A Undervoltage Lockout – LT1241 11 10 START-UP THRESHOLD 9 8 MINIMUM OPERATING VOLTAGE 7 6 –50 – 100 125 TEMPERATURE ( C) LT1241 • TPC01 Start-Up Current 200 START-UP ...
Page 5
W U TYPICAL PERFOR A Reference Voltage 5. 1mA O 5.04 5.03 5.02 5.01 5.00 4.99 4.98 4.97 4.96 4.95 –50 – 100 125 TEMPERATURE ( C) LT1241 • TPC10 Error Amplifier Open-Loop Gain ...
Page 6
LT1241 Series W U TYPICAL PERFOR A Output Deadtime vs Oscillator Frequency – LT1242, LT1244 60 50 5nF 2nF 1nF 40 30 500pF 20 10 100pF 0 0 100 1000 OSCILLATOR FREQUENCY (kHz) LT1241 • TPC19 Output Rise and Fall ...
Page 7
COMP (Pin 1): Compensation Pin. This pin is the output of the Error Amplifier and is made available for loop compen- sation. It can also be used to adjust the maximum ...
Page 8
LT1241 Series PPLICATI S I FOR ATIO for various values of R and Performance Characteristics section. Frequency and deadtime can also be calculated using the following formulas: Oscillator Rise Time 0.583 ...
Page 9
PPLICATI S I FOR ATIO Current Sense Comparator and PWM Latch LT1241 series devices are current mode controllers. Under normal operating conditions the output (Pin 6) is turned on at the start of every oscillator cycle, ...
Page 10
LT1241 Series PPLICATI S I FOR ATIO Undervoltage Lockout The LT1241 series devices incorporate an undervoltage lockout comparator which prevents the internal reference circuitry and the output from starting up until the supply voltage reaches the ...
Page 11
O U TYPICAL A PPLICATI External Clock Synchronization V REF 8 5V REF OSCILLATOR EXTERNAL C SYNC T 0.01 F INPUT + REQUIRED IF THE SYNC AMPLITUDE IS LARGE ...
Page 12
LT1241 Series U O TYPICAL A PPLICATI HOT 90VAC R5 0 250V BALEN 240VAC 1/2W MP3- NEU 1212-R6103 COILTRONICS AC GND R T1 MCID404 2KBPOO5M + C14 100 F 400V D6 ...
Page 13
O U TYPICAL A PPLICATI V REF COMP – 2.5V PACKAGE DESCRIPTIO CORNER LEADS OPTION (4 PLCS) 0.045 – 0.068 (1.143 – 1.727) FULL LEAD OPTION ...
Page 14
LT1241 Series PACKAGE DESCRIPTIO 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) +0.025 0.325 –0.015 +0.635 8.255 –0.381 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH ...
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
... Boost Regulator Steps Down from Up to 25V Using 4.7 H Inductors Complete Solution for Universal Off-Line Switching Power Supplies UV LOCKOUT V CC OUTPUT 7 PULL-DOWN OUTPUT 18V GND 5 + 1.5V – I SENSE 3 LT1241 • TA05 1241fa LT/TP 0297 5K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1992 ...