PDF PWM5031 Data sheet ( Hoja de datos )

Número de pieza	PWM5031
Descripción	RadHard High Speed PWM Controller
Fabricantes	Aeroflex Circuit Technology
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No Preview Available ! Standard Products PWM5031 RadHard High Speed PWM Controller www.aeroflex.com/Power August 2, 2005 FEATURES ❑ Radiation Hardness: y- Total Dose 1MRad(Si) r- Single Event Upset (SEU) 100MeV-cm2/mg ❑ CMOS Low Power Design a❑ Sleep & Enable Control Lines ❑ Optimized for Applications: Buck, Boost, Flyback, Forward and Center Tapped Push-Pull Converters in❑ Supports Current Mode or Voltage Mode Operations ❑ Selectable 50% / 100% Duty Cycle ❑ Under-Voltage Lockout with Hysteresis ❑ Dual ±1Amp Peak Totem Pole Outputs lim❑ 1 MHz Maximum – User Selectable ❑ Low RO Error Amp ❑ Auxiliary Op Amp with Shut Down Pin ❑ Power OK Indicator e❑ Designed for Commercial, Industrial and Aerospace Applications ❑ Ceramic 24-Gull lead, Hermetic Package, .6L x .3W x .13H r- Contact Factory for Die Availability P❑ DSCC SMD Pending NOTE: Aeroflex Plainview does not currently have a DSCC Certified Radiation Hardened Assurance Program Developed in Partnership with JHU/APL and the Technology Application Group for the Mars Technology Program; Part of NASA’s Mars Exploration Program OVERVIEW AND GENERAL OPERATION The chip is a fixed frequency Pulse Width Modulator based on the industry standard UC1843x Series with significant enhancements in performance and functionality. The chip operates in either the voltage or current mode and can support a wide variety of converter topologies. Radiation hardened by design techniques ensure the chip’s outstanding radiation tolerance (>1MRads) while reducing operating current by more than an order of magnitude over comparable parts. The PWM5031 provides an under voltage lockout feature with hysteresis that also provides an output to indicate Power is OK. An input called Sleep is used to power down the entire chip, the Enable input is used to shut down the Oscillator / Output Drives, and the Soft input drives the Output to zero. There is also a signal input called ENAUX that is used to disable the output to the auxiliary op-amp. The dual output drivers are designed using a Totem Pole output capable of sinking and sourcing 50mA constant current and peak currents up to 1 Amp to support a large variety of Power MOSFETs. Additional features that boost the appeal and utility of the part are: ◆ Dual break-before-make Totem Pole output stage is employed that virtually eliminates cross conduction and current shoot through ◆ Logic level input that allows the user to select either 50% or 100% maximum duty cycle operation ◆ Improved oscillator stage that vastly increases waveform linearity and reduces output voltage error ◆ Uncommitted on-board op-amp which can be used for signal conditioning, pulse feedback, or any other user defined purpose SCD5031 Rev B 1 page ELECTRICAL CHARACTERISTICS con’t 4.5 V < Vcc < 5.5V, -55°C < TA < +125°C, unless otherwise specified PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Error Amp Section Input Offset Voltage Input Common Mode Voltage Range yInput Bias Current rOpen Loop Voltage Gain (AVOL) aUnity Gain Bandwidth inPower Supply Rejection Ratio (PSRR) Output Sink Current Output Source Current limVOUT High (Limited by VSOFT) VOUT Low eCurrent Sense Section PrInput Offset Voltage Note 2 Note 2 Note 2 Note 2 Note 2 Note 2 VFB = 3.0V, VSOFT = 1.1V VFB = 2.0V, VSOFT = 5V VFB = 2.0V, RL = 15K to GND VFB = 3.0V, RL = 15K to +5V Note 2 - VEE + 0.2 - 100 1.0 60 - - VSOFT - 0.2 - - Common Mode Input Voltage VSOFT = 5V, Note 2 & 3 0.1 - - - - 2.0 - - - - - - - 3.3 VCC - 0.2 -1.0 - - - +62 -40 - VEE + 0.2 3.3 1.0 mV V µA dB MHz dB mA mA V V mV V Input Bias Current Note 2 - - 1.0 µA ISENSE to Output Delay - 80 100 ns Output Section Output Low Level ISINK = 1.0mA ISINK = 50mApk - - 0.1 V - - 0.3 V Output High Level ISOURCE = 1.0mA, DRVP = 5V ISOURCE = 50mApk, DRVP = 5V 4.9 - 4.7 - - - V V Peak Output Current - ±1.35 - A Steady State Output Current - 50 - mA Rise Time TA = 25°C, CL = 1.0nF - 8.0 - ns Fall Time TA = 25°C, CL = 1.0nF - 6.0 - ns SCD5031 Rev B 5 5 Page VSOFT 10 2.5V Error Amp 2R VFB 2 IS COMP 8 1.4V R R RS C CURRENT 11 SENSE GND 12 1V Current Sense Comparators SQ RQ Peak Current (Is) is determined by the formula: ISMAX = 1----.--0---V-- RS or ISMAX = V----S----O----F-----T----–-----1---.-4-- 3RS A small RC filter may be required to suppress switch transients FIGURE 6 – Current Sense Circuit 120 80 Gain dB 40 0 -40 1 Preliminary-55°C +125°C 10 100 1K 10K 100K 1M Frequency Hz 10M FIGURE 7 – Error Frequency Amplifier Open-Loop Response at +125°C & -55°C SCD5031 Rev B 11 11 Page

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