DatasheetsPDF.com

KA3511DS Dataheets PDF



Part Number KA3511DS
Manufacturers Fairchild Semiconductor
Logo Fairchild Semiconductor
Description Intelligent Voltage Mode PWM IC
Datasheet KA3511DS DatasheetKA3511DS Datasheet (PDF)

www.DataSheet4U.com www.fairchildsemi.com KA3511DS Intelligent Voltage Mode PWM IC Features • • • • • • • • • • • • • • Complete PWM control and house keeping circuitry Few external components Precision voltage reference trimmed to 2% Dual output for push-pull operation Each output TR for 200mA sink current Variable duty cycle by dead time control Soft start capability by using dead time control Double pulse suppression logic Over voltage protection for 3.3V / 5V / 12V Under voltage protectio.

  KA3511DS   KA3511DS



Document
www.DataSheet4U.com www.fairchildsemi.com KA3511DS Intelligent Voltage Mode PWM IC Features • • • • • • • • • • • • • • Complete PWM control and house keeping circuitry Few external components Precision voltage reference trimmed to 2% Dual output for push-pull operation Each output TR for 200mA sink current Variable duty cycle by dead time control Soft start capability by using dead time control Double pulse suppression logic Over voltage protection for 3.3V / 5V / 12V Under voltage protection for 3.3V / 5V / 12V One more external input for various protection (PT) Remote on/off control function (PS-ON) Latch function controlled by remote and protection input Power good signal generator with hysteresis Description The KA3511DS is a fixed frequency improved performance pulse width modulation control circuit with complete housekeeping circuitry for use in the secondary side of SMPS (Switched mode power supply). It contains various functions, which are precision voltage reference, over voltage protection, under voltage protection, remote on/off control, power good signal generator and etc. OVP (Over voltage protection) section It has OVP functions for +3.3V,+5V,+12V and PT outputs. The circuit is made up of a comparator with four detecting inputs and without hysteresis voltage. Especially, PT (Pin18) is prepared for an extra OVP input or another protection signal. UVP (Under voltage protection) section Precision reference section The reference voltage trimmed to ± 2% (4.9V ≤ Vref ≤ 5.1V) It also has UVP functions for +3.3V, +5V, +12V outputs. The block is made up of a comparator with three detecting inputs DataSheet4U.com and without hysteresis voltage. DataShee PG (Power good signal generator) section Power good signal generator is to monitor the voltage level of power supply for safe operation of a microprocessor. KA3511DS requires few external components to accomplish a complete housekeeping circuits for SMPS. Remote on/off section Remote on/off section is used to control SMPS externally. If a high signal is supplied to the remote on/off input, PWM signal becomes a high state and all secondary outputs are grounded. The remote on/off signal is transferred with some on-delay and off-delay time of 8ms, 24ms respectively. 24-SDIP 1 DataSheet4U.com ©2001 Fairchild Semiconductor Corporation Rev. 1.0.0 DataSheet 4 U .com www.DataSheet4U.com KA3511DS Internal Block Diagram 24 C1 RT 7 CT 8 OSCILLATOR PWM CONTROL D Q CK Q 22 C2 E TREM COMP E/A(-) E/A(+) 2 23 DEAD TIME CONTROLER R Q S 1.4V 0.1V 3 4 1.25V Delay Controller 5 6 REM (PS-ON) DEAD TIME CONTROL 21 INTERNAL BIAS 11 OVP COMP Vref Start Up Ichag 18 17 V5 PG GENERATOR 1.25V PG PT V12 V5 V3.3 VREF 14 Vref Vref 16 15 Vcc 1 V5 COMP3 1.8V!"0.6V DET 9 COMP2 1.8V!"0.6V et4U.com UVP COMP 1.25V DataShee DataSheet4U.com 10 TPG 19 20 TUVP GND ADSolute Maximum Ratings Parameter Supply voltage Collector output voltage Collector output current Power dissipation(KA3511DS) Operating temperature Storage temperature Symbol VCC VC1, VC2 IC1, IC2 PD TOPR TSTG Value 40 40 200 1.5 −25 to 85 −65 to 150 Unit V V mA W °C °C Temperature Characteristics Parameter Temperature coefficient of Vref (-25°C≤Ta≤85°C) Symbol ∆Vref/∆T Min. Typ. 0.01 Max. Unit %/°C DataSheet4U.com 2 DataSheet 4 U .com www.DataSheet4U.com KA3511DS Pin Definition : KA3511DS C1 E C2 DTC GND TUVP PT V12 V5 V3.3 Vref NC #24 #13 AS DS KA3511D #1 Vcc COMP E/A(-) EA(+) TREM REM RT CT DET TPG PG NC #12 et4U.com Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 Pin Name VCC COMP E/A(-) E/A(+) TREM REM RT CT DET TPG PG NC I/O I O I I I I O - Pin Function Supply voltage E/A output E/A (-) input E/A (+) input Remote on/off delay Remote on/off input Oscillation freq. setting R Oscillation freq. setting C Detect input PG delay Power good signal output NC Pin Number 13 Pin Name NC Vref V3.3 V5 V12 PT TUVP GND DTC C2 E C1 I/O O I I I I I O O Pin Function Descrition NC Precision reference VTG OVP, UVP input for 3.3V OVP, UVP input for 5V OVP, UVP input for 12V Extra protection input UVP delay Signal ground Deadtime control input Output 2 Power ground Output 1 DataShee 14 DataSheet4U.com 15 16 17 18 19 20 21 22 23 24 DataSheet4U.com 3 DataSheet 4 U .com www.DataSheet4U.com KA3511DS Pin Number Pin Name 1 2 3 4 5 VCC COMP E/A(-) E/A(+) TREM Pin Function Descrition Supply voltage. Operating range is 10V~30V. VCC=20V, Ta=25°C at test. Error amplifier output. It is connected to non-inverting input of pulse width modulator comparator. Error amplifier inverting input. Its reference voltage is always 1.25V. Error amplifier non-inverting input feedback voltage.This pin may be used to sense power supply output voltage. Remote on/off delay. Ton/Toff=8ms/24ms (Typ.) with C=0.1uF. Its high/low threshold voltage is 1.8V/0.6V. Remote on/off input. It is TTL operation and its threshold voltage is 1.4V. Voltage at this pin can reach normal 4.6V, with aDSolutely maxim.


KA3511 KA3511DS MS2200


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)