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L5993 Dataheets PDF



Part Number L5993
Manufacturers STMicroelectronics
Logo STMicroelectronics
Description CONSTANT POWER CONTROLLER
Datasheet L5993 DatasheetL5993 Datasheet (PDF)

® L5993 CONSTANT POWER CONTROLLER CURRENT-MODE CONTROL PWM SWITCHING FREQUENCY UP TO 1MHz LOW START-UP CURRENT (< 120µA) CONSTANT OUTPUT POWER VS. SWITCHING FREQUENCY HIGH-CURRENT OUTPUT DRIVE SUITABLE FOR POWER MOSFET (1A) FULLY LATCHED PWM LOGIC WITH DOUBLE PULSE SUPPRESSION PROGRAMMABLE DUTY CYCLE 100%AND 50% MAXIMUM DUTY CYCLE LIMIT PROGRAMMABLE SOFT START PRIMARY OVERCURRENT FAULT DETECTION WITH RE-START DELAY PWM UVLO WITH HYSTERESIS IN/OUT SYNCHRONIZATION LATCHED DISABLE INTERNAL 100ns .

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® L5993 CONSTANT POWER CONTROLLER CURRENT-MODE CONTROL PWM SWITCHING FREQUENCY UP TO 1MHz LOW START-UP CURRENT (< 120µA) CONSTANT OUTPUT POWER VS. SWITCHING FREQUENCY HIGH-CURRENT OUTPUT DRIVE SUITABLE FOR POWER MOSFET (1A) FULLY LATCHED PWM LOGIC WITH DOUBLE PULSE SUPPRESSION PROGRAMMABLE DUTY CYCLE 100%AND 50% MAXIMUM DUTY CYCLE LIMIT PROGRAMMABLE SOFT START PRIMARY OVERCURRENT FAULT DETECTION WITH RE-START DELAY PWM UVLO WITH HYSTERESIS IN/OUT SYNCHRONIZATION LATCHED DISABLE INTERNAL 100ns LEADING EDGE BLANKING OF CURRENT SENSE PACKAGE: DIP16 AND SO16N DESCRIPTION This primary controller I.C., developed in BCD60II technology, has been designed to implement off BLOCK DIAGRAM SYNC 1 RCT 2 TIMING + + 2.5V C-POWER 16 + BLANKING T DIS DC-LIM 15 MULTIPOWER BCD TECHNOLOGY DIP16 SO16N ORDERING NUMBERS: L5993 (DIP16) L5993D (SO16) line or DC-DC power supply applications using a fixed frequency current mode control. Based on a standard current mode PWM controller this device includes some features such as programmable soft start, IN/OUT synchronization, disable (to be used for over voltage protection and for power management), precise maximum Duty Cycle Control, 100ns leading edge blanking on current sense, pulse by pulse current limit, overcurrent protection with soft start intervention and ”constant power” function for cotrolling throughput power in multisync monitor SMPS. VCC 8 VREF 4 25V + 15V/10V PWM UVLO Vref DC 3 DIS 14 9 VC 13V S R PWM 10 OUT Q OVER CURRENT ISEN 13 + 1.2V 7 2R 1V R FAULT SOFT-START VREF OK CLK DIS 11 PGND SS + E/A 2.5V - 5 VFB 12 SGND 6 COMP D97IN765 July 1999 1/22 L5993 ABSOLUTE MAXIMUM RATINGS Symbol VCC IOUT Parameter Supply Voltage (ICC < 50mA) (*) Output Peak Pulse Current Analog Inputs & Outputs (6,7) Analog Inputs & Outputs (1,2,3,4,5,15,14, 13, 16) Power Dissipation @ Tamb = 70°C (DIP16) @ Tamb = 50°C (SO16) Junction Temperature, Operating Range Storage Temperature, Operating Range Value selflimit 1.5 -0.3 to 8 -0.3 to 6 1 0.83 -40 to 150 -55 to 150 Unit V A V V W W °C °C Ptot Tj Tstg (*) maximum package power dissipation limits must be observed PIN CONNECTION SYNC RCT DC VREF VFB COMP SS VCC 1 2 3 4 5 6 7 8 D97IN783 16 15 14 13 12 11 10 9 C-POWER DC-LIM DIS ISEN SGND PGND OUT VC THERMAL DATA Symbol Rth j-amb Parameter Thermal Resistance Junction -Ambient (DIP16) Thermal Resistance Junction -Ambient (SO16) Value 80 120 Unit °C/W °C/W PIN FUNCTIONS N. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name SYNC RCT DC VREF VFB COMP SS VCC VC OUT PGND SGND ISEN DIS DC-LIM C-POWER Function Synchronization. A synchronization pulse terminates the PWM cycle and discharges Ct Oscillator pin for external Ct, Rt components Duty Cycle control 5.0V +/-1.5% reference voltage at 25°C Error Amplifier Inverting input Error Amplifier Output Soft start pin for external capacitor Css Supply for internal ”Signal” circuitry Supply for Power section High current totem pole output Power ground Signal ground Current sense Disable. It must never be left floating. Tie to SGND if not used. Connecting this pin to Vref, DC is limited to 50%. If it is left floating or grounded no limitation is imposed Constant Power vs. Switching Frequency. Connect a capacitor to SGND. The pin must be connected to VREF if not used. 2/22 L5993 ELECTRICAL CHARACTERISTICS (VCC = 15V; Tj = 0 to 105°C; RT = 13.3kΩ; CT = 1nF unless otherwise specified.) Symbol VRef Parameter Output Voltage Line Regulation Load Regulation TS IOS Temperature Stability Total Variation Short Circuit Current Power Down/UVLO OSCILLATOR SECTION Initial Accuracy Duty Cycle Duty Cycle Duty Cycle Accuracy Oscillator Ramp Peak Oscillator Ramp Valley ERROR AMPLIFIER SECTION Input Bias Current VI GOPL SVR V OL VOH IO Input Voltage Open Loop Gain Supply Voltage Rejection Output Low Voltage Output High Voltage Output Source Current Output Sink Current Unit Gain Bandwidth SR Ib IS Slew Rate Input Bias Current Maximum Input Signal Delay to Output Gain SOFT START ISSC ISSD VSSSAT VSSCLAMP SS Charge Current SS Discharge Current SS Saturation Voltage SS Clamp Voltage Internal Masking Time OUTPUT SECTION V OL VOH VOUT CLAMP Output Low Voltage Output High Voltage Output Clamp Voltage IO = 250mA IO = 20mA; VCC = 12V IO = 200mA; VCC = 12V IO = 5mA; VCC = 20V 10 9 10.5 10 13 1.0 V V V V 3/22 VSS = 0.6V, Tj = 25°C DC = 0% 7 100 14 5 20 10 26 15 0.6 µA µA V V ns 2.85 Isen = 0 VCOMP = 5V 0.92 PWM CURRENT SENSE SECTION 3 1.0 70 3 15 1.08 100 3.15 µA V ns V/V VFB to GND VCOMP = VFB VCOMP = 2 to 4V VCC = 12 to 20V Isink = 2mA, VFB = 2.7V Isou rce = 0.5mA, VFB = 2.3V VCOMP > 4V, VFB = 2.3V VCOMP > 1.1V, VFB = 2.7V 5 0.5 2 1.7 6 1.3 6 4 8 2.5 2.42 60 pin 15 = Vref Tj = 25°C V CC = 12 to 20V 95 93 100 100 105 107 0 0 47 93 75 2.8 0.75 80 3.0 0.9 0.2 2.5 90 85 1.1 85 3.2 1.05 3.0 2.58 kHz kHz % % % % % V V µA V dB dB V V mA mA MHz V/µs Line, Load, Temperature Vref = 0V VCC = 8.5V; Isink = 0.5mA 4.80 30 0.2 Test Condition Tj = 25°C; IO = 1mA VCC = 12 t.


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