CRE6203 CRE | Alldatasheet
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er of High-performance Current Mode CRE6203 GE NERAL DESCRIPTION P WM controller of high-performance current mode is specially designed for AC/DC transformer with high performance and price ratio, which supplies continuous output power of 12W within the range of wide-voltage between 85V and 265V, the output power of peak value can be up to 15W. The combination of optimized reasonable circuit design and bipolar facture technology with high performance and price ratio economizes the whole cost ultimately. The power controller can be applied to the typical fly-back circuit topology so as to form a simple AC/DC transformer. When the output power is lower, IC will reduce the working frequency automatically, therefore, the standby power consumption becomes extremely low. When the power tube is closed, the interior circuit will bias it reversely, utilize the characteristic of high pressure resistance CB of bipolar transistor directly, and improve its pressure resistan ce capacity to the high voltage of 800V, which ensures the security of the power tube. . Meanwhile, the perfect function of overl oad and saturation prevention is provided inside of IC, which can keep away some abnormal status, such as overload, saturation of transformer, and output short circuit, so as to improve the reliability of t he power supply . The current limit and clock frequency can be set up by exterior components. . Now the standard encapsulation and the environmental protection leadless encapsulation that meets European standard of DIP8 are supplied . . FEATURE S Se t-in high-voltage power switch tube of 800V and few peripheral components. . With the modulation of lock pulse width, the testing is according to the pulse limit current. . With the function of output frequency reduction, the non- output power consumption can be less than 0.3W. Inner-built ramp and anti-fe edback compensation function. . The independent upper-limit current testing controller deals with over-current and over-load of the controller real- timely. . The period emission pole is turned off and it outputs by deflected voltage, and the pressure resistance of the power tube is improved. . Set-in current limit resistance with temperature. compensation, which makes the current limit precise. Set-in heat protection circuit. . Startup is accomplished with the magnification function of the switch power tube, and the power consumption of startup resistance is reduced more than10 times. Few peripheral components. . Low startup and operating current. . VCC over-voltage automatic limit. . Continuous wide-voltage output power reaches 12W, and the output power of peak value arrives at 15W. Compatible with THX203/RM6203 . . (1) APPLI CATIONS Adaptor (for example, travel charger, out p o w e r s t a t i o n ) . Open Frame (such as electromagnetic oven, microwave oven and etc.) . Pr oduct Specification CRE Semiconductor I nc.
er of High-performance Current Mode (2) Pr oduct Specification TYPICAL APPLICATION CRE6203 CRE6203 CRE Semiconductor I nc.
(3) Pin Conf iguration Th e pin map is shown as below for DIP8. A bsolute Maximum Ratings TERMINAL ASSIGNMENTS GE NERAL INFORMATION PWM Controll er of High-performance Current Mode Product Specification CRE6203 260℃,10SWelding temperature -55 — + 150℃Deposit temperature range 0— ﹢125℃Ope rating temperature range 1000mWTotal dissipation power 800mASwitching current of peak value -0.3-800VEndurance voltage of OC collector VCC+0.3VPins input voltage 16VStartup input voltage 16VPower supply voltage VCC Va luePa rameter Outpu t pins, meet switching transformerOC7,8 Switching current sampling and limit enactment, sampling resistance of external currentIS6 Supply electric pinsVCC2 Base electrode of power tube, control terminal of start-up current , external startup resistanceOB1 Feedback pinsFB5 Oscillate pins, external timing capacitance CT4 Meet grounding pinsGND3 Pin s DescriptionSy mbolPins M ARKING INFORAMTION CRE6203 CRE Semiconductor I nc. CRE6203 YYWW CRE6203: Product Name YY: Year Code (0~9) WW: Week Code (01~52)
(4) BLOCK DIA GRAM PWM Controll er of High-performance Current Mode Product Specification ELECTRI CAL CHARACTERISTICS TA = 25C, VCC = 5.5-5.7V, Ct=680pF, RS=1ohm , if not otherwise noted) dB7060Power Supply Suppression Ratio A V UNIT 0.27 0.60 TYP 0.290.25ILAn ti-Upper Limiting Current 0.650.55VCSC urrent Sampling Threshold Current Samp ling Section MA XMINTEST CONDITIONSSy mbolPA RAMETER Note 1. Maximum practical continuous power in an open frame design with sufficient drain pattern as a heat sink, at 50 ℃ ambient. OUTPUT POWER T ABLE DIP 812W15WCRE6203 Open FrameOpen Frame Package 85-264VAC230VAC±15% Product CRE6203 CRE Semiconductor I nc.
(5) ELECTRI CAL CHARACTERISTICS TA = 25C, VCC = 5.5-5.7V, Ct=680pF, RS=1ohm , if not otherwise noted) PWM Controll er of High-performance Current Mode Product Specification T he CRE6203 is guaranteed to meet performance specifications from0℃ to 70℃. Specifications over the -40℃ to 85℃ operating temperature range are assured by design, characterization and correlation with statistical process controls. V 10.5 4.0 4.8 9.0 3.2 V109.5O ver Voltage limiting Threshold 3.83.6Re-enabling voltage V4.64.4Oscillator turn off voltage Pull down Resistor Pull up Current V mA uA m A dB KΩ mA V KHZ mV uV mV/℃ mV V mA ns ns V V UNIT 3.2 3.5 0.65 2.6 290 MA X 8.8 3.0 2.4 0.60 2.2 0.2 2.5 270 TYP E Temperature stability 55CT=680pFF_OSCOscillating Frequency Ta=0-85℃Temperature stability D_minMinimum Duty Ratio PWM Se ction VCC=6.5-9VPower Supply Suppression Ratio CL=1nFTFOutput Fall time Ref erence Section Io=0.1mA—1.2mALoad Regulation Osci llator Section 1.6Initiation Reception Current 8.6Start up voltage VCC=6.5-9VVoltage stability Outp ut Section F=10HZ—10KHZOutput noise voltage Po wer Supply Current Section 2.8VCC=8VIQS tatic Current Initiation Static Current 0.55FB=2.5V,IS=0Input impedance Oscillator Amplitude (VP- 2.4Io =1.0mAVRE FR eference Output voltage VCC=6.5—9VLine Regulation F eedback Section 800I-OC=10mAMax withstanding voltage of the switching tube CL=1nFTROu tput Rise time I-OC=250mAVsa tSa turation voltage 53D_maxMaximum Duty Ratio 1000hour@85℃Long Term stability 250TJ=0—100℃Output limiting current MINTES T CONDITIONSSy mbolPA RAMETER NOT CRE6203 CRE Semiconductor I nc.
(6) OP ERATION DESCRIPTION Du ring start-up phase, the inner-reference voltage is closed when electrified; FB pull-up power source is closed, the start-up current is input from OB to VCC through BOOT circuit; when the voltage of VCC goes up to 8.8V, BOOT circuit stop working and not charge VCC, the start-up phase is ended, and it comes into the normal phase. . During normal phase, VCC voltage shall keep at 4.8~9.0V, the inner-reference voltage (VR) is 2.5V benchmark; FB pull-up current source starts up; the oscillator output OSC1 decides the maximum duty cycle, output OSC2 tries to touch off the power supply to enter open cycle to enter the open cycle, and shield flashing peak current of the power tube ; if FB is less than 1.8V (about between 1.2-1.8V), the cycle of the oscillator will increase with it, the less FB is, the wider the cycle of the oscillator is, until the oscillation stops (This characteristic reduces the standby power consumption of the switching power.) ; if the peripheral feedback tries to make VCC more than 9.6V, the in-circuit is fed back to FB and makes VCC stabilize the volt age at 9.6V (According to this Characteristic, we can may not adopt peripheral feedback circuit, and stabilize the output voltage by in-circuit, but the precision of stabilizing voltage is low); During the open cycle, OB supplies base current for the power tube, OE pulls down the emitter of the power tube to IS, and OB a dopts the driving parameter of ramp current ( it refers to that OB on- current is the parameter of IS, when IS is 0V, OB on-current is about 40mA, t hen OB on-current increases linearly with IS, when IS increases to 0.6V, OB on-current is about 120mA, this characteristic makes effective use of the output current of OB, decreases the power consumption of CRE6203),if IS detects that the specified current FB, it will come into the close cycle; during the close cycle, OB pulls down, the power tube will not shut off immediately, but OE clamps 1.5V (after the power tube is shut off, the base will be biased reversely, which improves the voltage endurance); during open or close cycle, if the power tube is detected beyond the upper limit current, the trigger of the upper limit current w ill be placed preferentially and forces FB to drop, the duty cycle will become less so as to protect the power tube and transformer; at the beginning of next close cycle or when FB is less than 1.8V, the trigger of the upper limit current will reset. In addition, CRE6203is installed over heat protection internally, when the internal temperature is higher than 140 ℃, it will broaden the cycle of the oscillator and makes the temperature of CRE6203less than 150 ℃; The ramp compensation is also placed internally, when CRE6203is in a big duty cycle or in the mode of constant current, it can stabilize the open/close cycle. . If VCC declines to 4.3V or so, the oscillator will shut off, OSC1 and OSC2 are in the low level, and the power supply keeps at close cycle; when VCC goes on declining to 3.7V or so, CRE6203will come into the start- up phase once again. . PWM Controll er of High-performance Current Mode Product Specification Norm al stage Switching Cycle Oscillogram Global Oscillogram CRE6203 CRE Semiconductor I nc.
(7) Electric Parameter Definitions S tart-up receives current: The current of OC when there’s a 0.5mA pull down current of OB in the start-up p e r i o d . . Start-up static current:The minimum current sourcing current which can enable VCC surging when VCC is connected to a filter capacitor and an adjustable current sourcing, CT is connected to a 680pF capacitor, and other pins with no connection. . Start-up voltage:The maximum of VCC above. Re-start-up voltage:The minimum of VCC above. Oscillator shut-down voltage:The negative-edge of VCC above; the value of VCC which can stop the oscillator. . Static current: The VCC power supply current in normal period when FB is connected to the ground by a 1.0KΩ resistance. . Oscillator pull up/pull down current: The pull up/pull down current of CT when FB=2.5V and CT=1.25V in normal period. . FB pull up current: which occurs in normal period, w h e n F B = 2 . 5 V , a n d I S = 0 A . . FB upper current protection: The pull down current of FB when FB=6V and IS=0.6A in normal period. Inside feedback power supply: The value of VCC when there is no feedback circuit of CRE6203 in normal period. . OC upper limit current: If FB=6V, the minimum OC current when there is pull down current in FB. Oscillator cycle: Which is the function of the capacitor connected to CT, about CT*25400 seconds. Current control switching power supply with fly-back design, discontinuous current operation mode. The power supply start-up current is 0.5-2mA which is alternative. The magnification of power transistor Q1 can be supposed as 10. Then the alternation of the start-up resistance must assure the current of the power transistor’s base is between 0.05mA to 0.2mA. Therefore, the power of the output resistance can reduce to 1/10, which reduces the p o w e r i n i d l e s t a t e . . In diagram 3, C3=680pF, the maximum operation frequency is about 67KHz . . The reference winding rectifier output is 4.8~9.0V (6V is recommended) of the Switching transformer (T1 in diagram 3), which provide operation power for CRE6203. . The maximum primary peak current of the switching transformer is 0.6A. When at wide voltage or 110V Vac , or 85V magnetism dissipation voltage, the maximum output power can achieve more than 12W. The OC (Pin 7, 8) of CRE6203 is in high voltage, and IS (Pin 6, for current sense resister) is connected. Therefore, it is easy to open a divider between pin 6 and 7 to meet the requirement of the safe regulation. Although there is over-temperature protection, when high-power output is needed without considering PCB heat dissipation, the output power and voltage may fall. . PWM Controll er of High-performance Current Mode Product Specification Power Supply Design Points CRE6203 CRE Semiconductor I nc.
(8) PACKA GE MECHANICAL DATA -Pin Plastic DIP PWM Controll er of High-performance Current Mode Product Specification 0.3540.3319.0008.400E2 0.0200.510A1 0.060 (BSC)1.524(BSC)B1 0.3700.3549.4009.000D 0.1420.1183.6003.000L 0.100(BSC)2.540(BSC)E 0.2600.2446.6006.200E 0.0220.0150.5700.380B 0.1700.1464.3103.710A MaxMinMaxMin 0.3120.2887.9207.320E1 0.0140.0080.3600.204C 0.1420.1263.6003.200A2 Dime nsions In InchesDimensions I n Millimeters Sy mbol CRE6203 CRE Semiconductor I nc.