M62281P/FP General Purpose Current Mode PWM Control IC REJ03D0840-0201 Rev.2.01 Nov 14, 2007 Description M62281P/FP is designed as a high speed current mode PWM control IC. This small 10 pin package contains many functions and protection circuits allowing simpler peripheral circuit and compact set design. This IC can operate high speed switching (700 kHz Max.) with high speed current sense comparator and current limiting circuit. Features • 700 kHz applicable to MOS-FET Output current Io(peak) = ±1 A Totempole output • CURRENT SENSE terminal separate from CLM terminal makes SMPS strong in noise. • High speed pulse-by-pulse current limiting • Timer type latch protection circuit with OVP (external reset is possible) • Soft start operation is possible (with dead time control) • Built-in OP Amp for feedback control (photo coupler can be driven) • Small start-up current 180 µA • Start-up voltage 12.5 V, Stop voltage 8.3 V Application Switching Regulator DC/DC converter REJ03D0840-0201 Rev.2.01 Nov 14, 2007 Page 1 of 12 M62281P/FP Block Diagram VCC CLM UVLO CLM comp. CT (OVP) Timer latch CLM Latch 0.2 V COLLECT Note R CS comp. EA IN S VOUT S PWM Latch − R + EMIT Note GND 2.5 V OSC. EA SOFT CURRENT OUT (Duty set-up) SENSE CF Note: GND terminal is connected to emitter terminal as M62281FP in IC inside. And VCC terminal is connected to collector terminal as M62281FP in IC inside. REJ03D0840-0201 Rev.2.01 Nov 14, 2007 Page 2 of 12 M62281P/FP Pin Arrangement M62281FP VOUT 1 10 VCC GND 2 9 EA IN CLM 3 8 EA OUT CURRENT SENSE 4 7 CT CF 5 6 SOFT (Top view) Outline: PRSP0010DB-A (10P2N-A) M62281P VOUT 1 14 COLLECT EMIT 2 13 VCC GND 3 12 EA IN CLM 4 11 EA OUT CURRENT SENSE 5 10 CT CF 6 9 SOFT N.C 7 8 N.C (Top view) Outline: PRDP0014AA-A (14P4) Absolute Maximum Ratings (Ta = 25°C, unless otherwise noted) Item Ratings Unit VCC IOUT 36 150 V mA CT terminal supply voltage VCT 1.0 36 A V EA IN terminal supply voltage CLM terminal supply voltage VEA IN VCLM 10 −0.3 to +4.0 V V CURRENT SENSE terminal supply voltage Power dissipation VCS Pd −0.3 to +5.8 1500 V mW Kθ 440 12 mW/°C °C °C Supply voltage Output terminal current Thermal derating Symbol Operating temperature Topr 3.52 −20 to +85 Storage temperature Tstg −40 to +150 REJ03D0840-0201 Rev.2.01 Nov 14, 2007 Page 3 of 12 Condition Continuous Peak P Ta ≥ 25°C FP P FP M62281P/FP Electrical Characteristics (Ta = 25°C, VCC = 14 V, unless otherwise noted) Block Item Max. Unit All device Supply voltage range Operation start-up voltage VCC VCC(START) VCC(STOP) 11.5 12.5 35 13.5 V V Operation stop voltage Start-up and stop Voltage difference VCC(STOP) ∆VCC 7.6 3.5 8.3 4.2 9.0 5.1 V V Stand-by current ICCL 90 180 270 µA CT Error Amp Current sense CLM SOFT OSC Symbol Limits Typ. Min. Test Conditions VCC = VCC(START) − 0.5 V Operating current ICCO 7.5 13 19 mA Timer latch circuit current ICCOFF 0.9 0.8 2.0 1.8 3.0 2.7 mA mA CT term. “H” threshold voltage CT term. “L” threshold voltage VTHCTH 3.5 4.0 4.5 V VTHCTL 0.4 0.7 1.0 V CT term. discharge current CT term. charge current ICTDCHG 70 110 165 µA In normal operation ICTCHG −33 −14 −5 µA In CLM actuating Reference voltage Input bias current VB IB 2.4 −300 2.5 −100 2.6 0 V nA Open loop gain Unity gain bandwidth AV fT 70 1 dB MHz Output source current Output voltage (High) IOS VOm+ −460 5.3 −370 5.8 −240 6.25 µA V Output voltage (Low) CS term. input voltage gain VOm− AVCS 0 0.2 3.0 0.35 V V/V Input bias current CS term. delay time IB TPDCS −5 −1 150 µA ns CLM term. threshold voltage CLM term. output current VTHCLM 180 200 220 mV IOUTCLM VCC = 14 V VCC = VCC(STOP) + 0.2 V VEAIN = 0 V Delay time to output −270 −200 −140 µA VCLM = 0 V CLM term. delay time Input voltage range at 0% duty TPDCLM VSOFT (0%) 0 100 1.0 ns V Delay time to output Soft term. voltage range to set 0% duty Input voltage at 50% duty VSOFT (50%) 2.7 V Soft term. voltage at 50% duty Maximum duty Duty Max 83 90 97 % Soft term. input current Maximum oscillation frequency ISOFT fOSCmax −50 −43 −36 700 kHz Oscillation frequency Oscillation upper limit voltage fOSC VOSCH 130 3.2 180 3.6 230 4.0 kHz V CF = 270 pF CF = 270 pF Oscillation lower limit voltage Oscillation voltage VOSCL 1.2 1.4 1.6 V CF = 270 pF ∆VOSC 1.9 2.2 2.5 V CF = 270 pF REJ03D0840-0201 Rev.2.01 Nov 14, 2007 Page 4 of 12 M62281P/FP (Ta = 25°C, VCC = 14 V, unless otherwise noted) Block Output Item Symbol Output low voltage Output high voltage Output voltage rise time Output voltage fall time Limits Typ. Max. Unit VOL1 0.04 0.4 V VOL2 0.3 1.4 V VOH1 12.0 12.7 V VOH2 11.5 12.5 V TRISE TFALL 50 35 ns ns Min. Test Conditions VCC = 14 V, IO = 10 mA VCC = 14 V, IO = 100 mA VCC = 14 V, IO = −10 mA VCC = 14 V, IO = −100 mA No load No load Function Description and Application EA IN, EA OUT Terminal Circuit for EA OUT terminal is connected to constant current load (370 µA Typ.) shown in figure 1. Output voltage of error amp. is controlled by the output transistor to provide current-sense comp. with the controlled voltage. 370 µA EA OUT To current-sense comp. Figure 1 Circuit Diagram of EA OUT Terminal 1. Peripheral circuit of Error Amp Detected voltage divided by R1 and R2 is input to EA IN terminal in such case as fly-back system where VCC line voltage is proportional to output voltage, or in the case that the voltage detection is made on the primary side. In this case operating region is set by R1 and R2, and AC gain by R1//R2, RF. From detecting voltage Reference voltage (2.5 V) + R1 − EA IN R2 EA OUT RF Figure 2 Method to Detect The Voltage on The Primary Side REJ03D0840-0201 Rev.2.01 Nov 14, 2007 Page 5 of 12 M62281P/FP In the case that feed forward system by photo-coupler is applied, following two methods are available. One is the method by error amp. as in figure 3-1, the other is by the direct connection to photo-coupler as in figure 3-2. When photo-coupler is directly connected to EA OUT terminal, input terminal of error amp. is connected to GND, photo-coupler is connected directly to EA OUT terminal. VCC R1 Reference voltage (2.5 V) + RIN EA IN − EA OUT R2 RF Figure 3-1 Method to Use Photo-Coupler (1) Reference voltage (2.5 V) + − EA IN EA OUT Figure 3-2 Method to Use Photo-Coupler (2) In figure 3-1, AC gain is represented as : AV = RF / RIN Proper gain setting is about 40 dB. RF should be 52 kΩ or more due to the current source capability of error amp. R1, R2 should meet the condition as below so that the voltage of EA IN terminal should not be over 5 V. R2 • VCC / (R1 + R2) ≤ 5 V Due to the input impedance of EA IN terminal, the current in R1, R2 should be less than several mA. CT (OVP) Terminal Timer type latch circuit works as follows. Constant charge current flows out from CT terminal to the external capacitor when CLM is operative. When the voltage of CT terminal rises up to over 4.0 V (Typ.), the latch circuit operates to make functions of this IC inoperative. Inoperative status is sustained until supply voltage becomes less than stop voltage. The value for start-up register has to be set so that the current over 1.8 mA (Typ.) can flow the resistor because the stop status has to be kept by the current in start-up resistor R1 shown in application circuit. When timer latch circuit is operative, supply current increases at high voltage as shown in figure 4 to avoid the damage caused by unnecessarily in creased supply voltage. Inoperative status goes back to operation by forcibly decreasing the voltage of CT terminal to less then 0.7 V. REJ03D0840-0201 Rev.2.01 Nov 14, 2007 Page 6 of 12 Supply Current (at timer latch) ICCOFF (mA) M62281P/FP 3.0 2.5 Latch reset 8.3 V 2.0 1.5 1.0 0.5 0 5 10 15 20 25 30 35 40 Supply Voltage VCC (V) Figure 4 Supply Current vs. Supply Voltage Characteristics (at Timer Latch) Even if the timer function is not needed, latch function operates, that is, IC becomes in operative when the voltage of CT terminal is forced to be high voltage. Therefore, CT terminal can also be used for OVP (over voltage protection). When only OVP function is needed (timer latch function is not necessary), connect the resistor between CT terminal and GND. In this case, the above mentioned charge current cannot make the voltage of CT terminal rise up to “H” threshold, thus latch function does not operate. (Refer to figure 5-1, 5-2) VCC OVP function operates when photo-coupler is ON. CT + Figure 5-1 Method to Use Timer Type Latch And OVP VCC OVP function operates when photo-coupler is ON. CT + Figure 5-2 Method to Use Only OVP REJ03D0840-0201 Rev.2.01 Nov 14, 2007 Page 7 of 12 M62281P/FP SOFT (Duty Set-Up) Terminal The voltage of SOFT terminal determines the maximum duty. Maximum duty can be set by connecting the resistor as in figure 6 because the constant current compensated for temperature flows out of this terminal. And by connecting the capacitor between the terminal and GND, soft start function operates. That is, we can get the gradual increase of maximum duty at start-up. SOFT CSOFT + VSOFT Figure 6 Method to Set Up Duty and SOFT Start Function Maximum duty is represented as : Duty (Max.) ≈ (42 • VSOFT) − 59 (%) where VSOFT = ISOFT • RSOFT (V), ISOFT = 43 µA (Typ.) If the voltage of SOFT terminal is higher than 3.53 V (Typ.) (upper limit voltage of the oscillation waveform), maximum duty is internally decided to be 90%. Soft start time (TSOFT) is represented as : TSOFT ≈ CSOFT • 31 • 10 (s) 3 TSOFT means the time from start-up until the voltage of SOFT terminal goes up to higher than 1.4 V (Typ.) (lower limit voltage of the oscillation waveform). Discharging circuit operative before start-up at VCC is internally equipped so that the soft start never fail to operate at the restart of voltage supply. CLM Terminal This terminal is for pulse-by-pulse current limiting. Current limiting circuit is almost the same as that of M51995. CLM terminal is separate from CURRENT SENSE terminal allowing the noise filter to be optimized and the highspeed over current protection. The voltage detected by the current detecting resistor can be directly input as shown in figure 7-1, if the detected voltage is about the threshold voltage (200 mV (Typ.)), but if the voltage is larger than the threshold, the voltage has to be input divided by resistors as shown in figure 7-2. CLM OUT RNF CNF RCS Figure 7-1 Peripheral Circuit of CLM REJ03D0840-0201 Rev.2.01 Nov 14, 2007 Page 8 of 12 M62281P/FP CLM OUT RNF1 CNF RNF2 RCS Figure 7-2 Peripheral Circuit of CLM When The Detected Voltage is High 1000 pF to 22000 pF is recommended for CNF. Be sure to use 100 Ω or less for RNF and RNF1 // RNF2 (*) so that the detection sensitivity is not influenced by the current flown out from CLM terminal. Non-inductive resistor is recommended for current detecting resistor. * RNF1 // RNF2 = (RNF1 • RNF2) / (RNF1 + RNF2) CURRENT SENSE Terminal The voltage proportional to the switching current is supplied to this terminal. Output duty is controlled by comparing this voltage with the output of error amp.. CLM and CURRENT SENSE terminal is separate from each other, so various settings are available depending upon the application. CURRENT SENSE OUT RNF CNF RCS VCS Figure 8 Peripheral Circuit of CURRENT SENSE RCS is determined by : VCS = (VEA OUT − 1.3) / 3 (V), where VEA OUT represents the voltage of EA OUT terminal. CF Terminal Oscillation frequency is set by capacitor connected to CF terminal. The waveform of CF terminal is triangular one with the ratio of 9 : 1 for charge-discharge period. Oscillation frequency is represented as : fOSC = 1 (19.4 × 103 × COSC) + (0.4 × 10−6) REJ03D0840-0201 Rev.2.01 Nov 14, 2007 Page 9 of 12 (Hz) M62281P/FP Attention for heat generation Although the absolute maximum rating of ambient temperature is spelled out as 85°C, it is always annoying to specify the location this temperature refers to because the power dissipation generated locally in switching regulator is fairly large and the temperature in the vicinity of the IC varies from place to place. One of the recommendable ways to solve this problem is to check the temperature on the surface of the IC. The difference in temperature between IC junction and the surface of IC package is 30°C or less when IC junction temperature is measured by utilizing the temperature characteristics of p-n junction forward voltage, and the surface temperature by "thermo-viewer" on the condition that the IC is mounted on the "phenol-base" PC board in normal atmosphere. This concludes that maximum case temperature (surface temperature of IC package) rating is 100°C with adequate margin considering the absolute maximum rating of junction temperature is 150°C. REJ03D0840-0201 Rev.2.01 Nov 14, 2007 Page 10 of 12 REJ03D0840-0201 Rev.2.01 Nov 14, 2007 Page 11 of 12 AC input CFIN + R2 + CT + CVCC EA IN CF CF VCC GND CLM EMIT Note CURRENT SENSE OUT COLLECT Note TL431 RCS + Note: GND terminal is connected to emitter terminal as M62281FP in IC inside. And VCC terminal is connected to collector terminal as M62281FP in IC inside. + EA OUT SOFT CT (OVP) CSOFT R1 DC output M62281P/FP M62281 Application Circuit (Feed-Forward) RDUTY Rush current prevention circuit Line filter M62281P/FP Package Dimensions JEITA Package Code P-SOP10-5.7x6.8-1.27 RENESAS Code PRSP0010DB-A MASS[Typ.] 0.2g E 6 *1 HE 10 Previous Code 10P2N-A F NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET. 1 A2 5 Index mark A1 c *2 Reference Symbol A L D *3 e bp Detail F y D E A2 A1 A bp c HE e y L RENESAS Code PRDP0014AA-A Previous Code 14P4 8 1 7 0 0.35 0.18 0° 7.82 1.12 0.3 Nom Max 6.8 6.9 5.7 5.8 1.8 0.1 0.2 2.1 0.4 0.5 0.2 0.25 8° 8.12 8.42 1.27 1.42 0.1 0.5 0.7 MASS[Typ.] 1.0g c *1 E 14 Min 6.7 5.6 e1 JEITA Package Code P-DIP14-6.3x19-2.54 Dimension in Millimeters D L A1 A A2 *2 NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET. e *3 b3 SEATING PLANE bp Reference Symbol e1 D E A A1 A2 bp b3 c e L REJ03D0840-0201 Rev.2.01 Nov 14, 2007 Page 12 of 12 Dimension in Millimeters Min Nom Max 7.32 7.62 7.92 18.8 19.0 19.2 6.15 6.3 6.45 4.5 0.51 3.3 0.4 0.5 0.6 1.4 1.5 1.8 0.22 0.27 0.34 0° 15° 2.29 2.54 2.79 3.0 Sales Strategic Planning Div. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Notes: 1. This document is provided for reference purposes only so that Renesas customers may select the appropriate Renesas products for their use. Renesas neither makes warranties or representations with respect to the accuracy or completeness of the information contained in this document nor grants any license to any intellectual property rights or any other rights of Renesas or any third party with respect to the information in this document. 2. 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