M62212P/FP/GP General Purpose DC/DC Converter REJ03D0843-0200 Rev.2.00 Jun 14, 2006 Description M62212 is designed as a general purpose DC/DC converter. This small 8-pin package contains many functions allowing simpler peripheral circuits and compact set design. The output transistor is open collector and emitter follower type. This makes the control STEP-UP, STEP-DOWN and INVERTING converter. Feature • • • • Wide operation power supply voltage range…….. 2.5 to 18 V Low power consumption…….……..…….……… 1.3 mA typ High speed switching is possible (300 kHz). Output short protection circuit and ON/OFF control are used. The dead-time control and the soft-start operation are possible • Package variation: 8-pin DIP/SOP/SSOP8 Applications General electric products, DC/DC converter Block Diagram VCC 8 UVLO VTH: 2.3 V PWM Comp COSC 4 1 Collector output − + + OSC 2 Emitter output VCC 1.25 V VCC IN 7 OP Amp + − 1.86 V R 1.25 V + − S 1.15 V 6 FB Rev.2.00 Jun 14, 2006 page 1 of 8 Short protection circuit − + 5 DTC 3 GND 0.3 V Q M62212P/FP/GP Pin Arrangement M62212P/FP/GP Collector output Emitter output 1 8 VCC 2 7 IN GND 3 6 FB COSC 4 5 DTC (Top view) Outline: PRDP0008AA-A (8P4) [P] PRSP0008DA-A (8P2S-A) [FP] 8P2X-A (SSOP-8) [GP] Rev.2.00 Jun 14, 2006 page 2 of 8 M62212P/FP/GP Absolute Maximum Ratings (Ta = 25°C, unless otherwise noted) Item Power supply voltage Symbol VCC Ratings 19 Units V Output voltage Output current VO IO 19 150 V mA Power dissipation Thermal derating ratio Pd Kθ 625 (P) 360 (FP) 250 (GP) 5.00 (P) 2.88 (FP) 2.00 (GP) mW mW/°C Operating ambient temperature Storage temperature Topr Tstg −20°C to +85 −40°C to +125 °C °C Conditions Ta = 25°C Ta > 25°C Electrical Characteristics (Ta = 25°C, VCC = 12 V, COSC = 100 pF, unless otherwise noted) Block Item Symbol Min Limits Typ Max Units Test Condition All device Range of power supply voltage Standby current VCC ICC ST 2.5 1.3 18 1.8 V mA Std. voltage section Error Amp. section Standard voltage VREF 1.19 1.25 1.31 V Voltage follower Line regulation LINE 5 12 mV VCC = 2.5 to 18 V Oscillator section UVLO section Short protection circuit Output section Output "OFF" status Input bias current IB 500 nA Open loop gain Unity gain bandwidth AV GB 80 0.6 dB MHz Output high voltage Output low voltage VOM+ VOM− 1.82 2.62 400 V mV Output sink current Output source current lOM+ IOM− 6 −60 −30 mA µA Oscillation frequency Upper limit voltage of oscillation waveform fOSC VOSCH 110 1.0 kHz V Lower limit voltage of oscillation waveform Cosc charge current VOSCL 0.45 V IOSC CH −40 µA Cosc discharge current 1 Start-up threshold voltage IOSC DlS1 VTH ON 2.2 10 2.3 2.4 µA V VIN = 1 V Shut-down threshold voltage Hysteresis VTH OFF VHYS 20 2.25 50 80 V mV VIN = 1 V VHYS = VTHON − VTHOFF FB threshold voltage Latch mode “H” threshold voltage VTH FB VTH DTC 1.86 1.15 V V VIN = 1 V, VDTC = 0.7 V VIN = 1 V, VFB = 2.11 V Latch mode “L” threshold voltage DTC charge current when start-up VTL DTC ICH1 0.3 −45 V µA VIN = 1 V, VFB = 2.11 V VDTC = 0.7 V, VFB = 2.11 V DTC discharge current 1 DTC charge current when stable state IDIS1 ICH2 50 −10 µA µA VDTC = 0.7 V, VFB = 2.11 V VDTC = 0.7 V, VFB = 0.7 V DTC discharge current 2 Collector output leak current IDIS2 ICL −1 15 1 µA µA VDTC = 0.2 V, VFB = 2.11 V VCE = 18 V, VCC = 18 V Collector output saturation voltage 1 VSAT1 0.3 1.1 V Emitter GND, IC = 150 mA, VE = 0 V Collector output saturation voltage 2 VSAT2 1.6 V Emitter follower, IE = 50 mA, VC = 12 V Rev.2.00 Jun 14, 2006 page 3 of 8 VFB = 1.86 V VIN = 1 V M62212P/FP/GP Application Circuit L VIN + CIN D 8 R1 + COUT VOUT 1 R2 4 COSC M62212P/FP/GP 2 7 6 5 3 + Figure 1 STEP-DOWN Converter with Current Buffer Transistor Function Description 1) Soft start (The peripheral circuit is shown in Figure 1) When the power is turned ON, input terminal IN is at 0 V level. Therefore, the FB terminal is fixed to High level. The DTC terminal goes up gradually starting from 0 V due to the internal charge current and the external CDTC. When the level of DTC terminal reaches the lower limit of the triangular wave of the oscillator, PWM comparator and the output circuit go into operation causing the output voltage, "VO" of the DC/DC converter to rise. The charge current is designed to be approximately 45 µA. FB DTC 1.0 V OSC 0.45 V OFF External Tr collector ON Figure 2 Rev.2.00 Jun 14, 2006 page 4 of 8 M62212P/FP/GP 2) DTC The dead time control is set by installing a resistor between the DTC terminal and GND. However, the DTC terminal serves as the short protection circuit also. Therefore, its set up depends on whether the short protection circuit is used and not. When the short protection circuit is used At this time, the charge current for DTC is approximately 10 µA. Therefore, RDTC should be set to 40 kΩ to 110 kΩ. When the short protection circuit is not used At this time, the charge current for DTC is approximately 45 µA. Therefore, RDTC is set to 12 kΩ to 25 kΩ. 3) Short protection circuit The short protection circuit used the timer latch system. It is determined by setting the capacity used for the soft start connected to the DTC terminal. Figure 3 shows the short protection circuit and the timing chart for various modes. When the power is turned on, the FB terminal goes high (approx. 2.3 V) and the DTC terminal goes low. (goes up slowly from 0 V) Thus, approximately 45 µA current will flow when SW1: ON and SW2: OFF. The potential, namely the potential of the FB terminal is in the amplitude of the triangular wave, SW1 will be OFF and SW2 will be ON and approximately 50 µA will flow into the DTC terminal. This discharge current will cause the DTC terminal to drop from 1.15 V. At this time, if the potential of the FB terminal goes to the control potential before the potential at the DTC terminal goes lower than 0.45 V which is the lower limit value of the triangular wave and if the potential of the FB terminal is lower than the potential of the DTC terminal, then the system is activated. When the output is shorted, the system is either activated or latched depending on whether the time for the high potential of the FB terminal reaches the potential of the control state is long or short. (For detail, see [II] and [IV] of the Mode) There are two ways to go back to operation after the latch to shut off output. Either method can restart with soft start. 1. Turning ON the VCC. 2. Make the FB terminal to go to the low potential of 1.86 V or less. Then, it is cancelled. [Mode Explained] [I] Mode………… Activation This is used when the FB terminal goes down to the control state potential when the DTC terminal is in up slope. In order for the activation to occur when the DTC terminal is in down slope, the FB terminal potential must go below the DTC terminal before the DTC terminal goes to 0.45 V. [II] Mode…........... Output short → Activation The system is activated if the FB terminal potential goes below the DTC terminal potential before the DTC terminal goes to 0.45 V. If there is not enough time, the output is turned OFF. (Latched) [III] Mode….......... ON/OFF control → Activation This mode turns off the output by forcing the DTC terminal to go down. (The system) returns as in the case of the activation. [IV] Mode….......... Output short (Latch) The output is turned OFF when the FB terminal potential did not go down to the control state before the DTC terminal went down to 0.45 V. Rev.2.00 Jun 14, 2006 page 5 of 8 M62212P/FP/GP Comp1 − + FB 1.86 V R I2 35 µ I1 10 µ S SW1 DTC RDTC 90 kΩ (900 mV) Q VCC 1.25 V CDTC (Initial RESET) I3 60 µ Comp2 + − 1.15 V 0.3 V SW2 Note: SW1 and SW2 are turned ON by "H" signal. FB 2.0 DTC set up value (Tentative) DTC 1.15 1.0 OSC 0.45 0 I1 ON ON ON ON ON ON ON ON ON ON ON I2 ON OFF OFF OFF OFF ON ON OFF OFF OFF ON I3 OFF ON OFF ON OFF OFF OFF ON OFF ON ON Charge 10µ Discharge 50µ Charge 10µ Charge 45µ Charge Discharge 45µ 50µ Charge 10µ Discharge 50µ Discharge 15µ Charge Discharge 45µ 50µ Activate Output short [ I ] [ II ] ON/OFF control [ III ] Activate Output short (Latch) [ IV ] Figure 3 Short Protection Circuit and the Timing Chart of the Modes Rev.2.00 Jun 14, 2006 page 6 of 8 M62212P/FP/GP Constant Definition Constant Step-down Circuit Step-up Circuit Inverse Polarity Circuit TON VO + VF VO + VF − VIN VO + VF TOFF VIN − VCE (sat) − VO VIN − VCE (sat) VIN − VCE (sat) 1 fosc 1 fosc 1 fosc TON + TOFF TON + TOFF TON + TOFF TON + TOFF TOFF (MIN) 1+ 1 fosc TON (MAX) D (MAX) Calculate from start-up time Calculate from shat down time 1 fosc − TOFF TON TOFF − TOFF TON (MAX) TON (MAX) TON + TOFF TON + TOFF VREF Use short protection 1+ TOFF TON (MAX) VO Not use short protection 1 fosc TON TON + TOFF ∆IO R1 *2, *3 note: − TOFF (VIN − VCE (sat) − VO) × TON (MAX) L (MIN) *1 CDTC *4 1+ TOFF 1 −12 75 × 103 × fosc − 16 × 10 COSC RDTC *4 TON −1 1 −12 75 × 103 × fosc − 16 × 10 (VIN − VCE (sat) )2 × TON (MAX)2 × fosc 1 −12 75 × 103 × fosc − 16 × 10 (VIN − VCE (sat) )2 × TON (MAX)2 × fosc 2 × VO × IO × R2 VO VREF −1 × R2 2 × VO × IO VO VREF −1 VDTC (MAX) VDTC (MAX) ICH1 ICH1 ICH1 VDTC (MAX) VDTC (MAX) VDTC (MAX) ICH2 ICH2 × R2 VDTC (MAX) ICH2 ICH1 × tstart ICH1 × tstart ICH1 × tstart VDTC (MAX) VDTC (MAX) VDTC (MAX) IDIS1 × tshort VDTC (MAX) − VOSCL IDIS1 × tshort VDTC (MAX) − VOSCL IDIS1 × tshort VDTC (MAX) − VOSCL VF: Forward voltage of outer diode. VCE (sat): Saturation voltage of M62212 or saturation voltage of current buffer transistor Please setting the oscillation frequency first and calculate each constant value. 1. Please setting ∆IO about 1/3 to 1/5 of maximum output current 2. |VO| = (1 + R1 ) × VREF R2 3. Please setting R2 about few kΩ to score fo kΩ because output voltage don’t undergo a influence of input current (Terminal 7) 4. Please setting VDTC (MAX) to satisfy D (MAX), fixed from characteristics of D (MAX) − VDTC (MAX). ICH1 means DTC charge current when start-up (−45 µA typ), ICH2 means DTC charge current when stable state (−10 µA typ), VOSCL means lower limit voltage of oscillation waveform (0.45 V typ), and IDIS1 means DTC discharge current 1 (50 µA typ). tstart means time interval when terminal voltage of DTC increase to VOSCL from lower voltage and to start switching at first. tshort means time interval when output is shut down after output is shorted Rev.2.00 Jun 14, 2006 page 7 of 8 M62212P/FP/GP Package Dimensions RENESAS Code PRDP0008AA-A 5 1 4 MASS[Typ.] 0.5g c *1 E 8 Previous Code 8P4 e1 JEITA Package Code P-DIP8-6.3x8.84-2.54 NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET. *2 D e1 D E A A1 A2 bp b2 b3 c L A1 A A2 Reference Symbol SEATING PLANE *3 b 3 *3 b 2 bp e e L JEITA Package Code P-SOP8-4.4x5-1.27 RENESAS Code PRSP0008DA-A Min Nom Max 7.32 7.62 7.92 8.7 8.9 9.1 6.15 6.3 6.45 4.5 0.51 3.3 0.4 0.5 0.6 0.9 1.0 1.3 1.4 1.5 1.8 0.22 0.27 0.34 0° 15° 2.29 2.54 2.79 3.0 MASS[Typ.] 0.07g E 5 *1 HE 8 Previous Code 8P2S-A Dimension in Millimeters F 1 NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET. 4 Index mark c A2 *2 A1 D L A Reference Symbol *3 e bp y D E A2 A1 A bp c Detail F HE e y L Rev.2.00 Jun 14, 2006 page 8 of 8 Dimension in Millimeters Min Nom Max 4.8 5.0 5.2 4.2 4.4 4.6 1.5 0.05 1.9 0.35 0.4 0.5 0.13 0.15 0.2 0° 10° 5.9 6.2 6.5 1.12 1.27 1.42 0.1 0.2 0.4 0.6 Sales Strategic Planning Div. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Keep safety first in your circuit designs! 1. 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