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| Power Management MICROELECTRONICS A A GM34063 1.5A DC-TO-DC CONVERTER CONTROL CIRCUIT Description GM34063 has all the functions required for DC-to-DC converters: an internal temperature- compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver, and highcurrent output switch. GM34063 is designed for step-down, step-up and voltage-inverting applications by using a minimum number of external components. Features 3.0V to 40V input Adjustable Output Voltage Current Limiting Output Switch Current to 1.5A Low Standby Current Operating Frequency to 100kHz Precision 2% Reference Application CD-ROM Motherboards SMPS Power Supply Battery Chargers DSL Modem SCHEMATIC DIAGRAM 8 Driver Collector S R 7 Ipk Sense Ipk Oscillator CT 6 VCC 100 Q Q2 Q1 1 Switch Collector 2 Switch Emitter 3 Comparator + 1.25V Reference Regulator Timing Capacitor 5 Comparator Inverting Input (Bottom View) 4 GND www.gammamicro.com GM34063 1 V0.1 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT MARKING INFORMATION & PIN CONFIGURATIONS (TOP VIEW) SOP-8 Ipk Sense Driver Collector VCC Comparator Inventing Input Ipk Sense Driver Collector DIP - 8 VCC Comparator Inventing Input 8 7 6 5 8 7 6 5 GM34063 AYWW 1 Switch Collector Switch Emitter GM34063 AYWW 2 3 4 GND Timing Capacitor Switch Collector Switch Emitter 1 2 3 4 GND Timing Capacitor A : Assembly Location Y : Year W W : Weekly ORDERING INFORMATION Ordering Number GM34063D8T GM34063S8T GM34063S8R Operation Ambient Temperature Range 0 to 70C 0 to 70C 0 to 70C Package DIP-8 SOP-8 SOP-8 Shipping 60 Units/ Tube 100 Units / Tube 2,500 Units /Tape &Reel * For detail Ordering Number identification, please see last page. GM34063 2 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT ABSOLUTE MAXIMUM RATINGS PARAMETER Power Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage (VPIN1 = 40 V) Switch Collector to Emitter Voltage Driver Collector Voltage Driver Collector Current(Note 1) Switch Current SYMBOL VCC VIR VC(Switch) VE(Switch) VCE(Switch) VC(driver) IC(driver) ISW VALUE 40 -0.3 to + 40 40 40 40 40 100 1.5 UNIT Vdc Vdc Vdc Vdc Vdc Vdc mA A Power Dissipation and Thermal Characteristics Plastic Package, D Suffix TA = 25C Thermal Resistance SOIC Package, S Suffix TA = 25C Thermal Resistance Operating Junction Temperature Operating Ambient Temperature Range GM34063 GM34063E Storage Temperature Range Note 1. Maximum package power dissipation limits must be observed PD RqJA PD RqJA 1.25 100 625 160 W C/W mW C/W TJ +150 C TA 0 to + 70 -40 to +125 -65 to +150 C TSTG C GM34063 3 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, TA = TIOW TO Thigh unless otherwise specified) CHARACTERISTICS OSCILLATOR Frequency (Vpin5 = 0 V, CT = 1.0nF, TA = 25C) Charge Current (VCC = 5.0V to 40V, TA = 25C) Discharge Current (VCC = 5.0V to 40V, TA = 25C) Discharge to Charge Current Ration (Pin 7 to VCC TA = 25C) Current Limit Sense Voltage (Ichg = Idischg, TA = 25C ) Symbol Min Typ Max Unit fOSC Ichg Idischg Idischg/ Ichg Vipk(sense) 24 24 140 5.2 250 33 35 220 6.5 300 42 42 260 7.5 350 kHz A A mV OUTPUT SWITCH (Note 2) Saturation Voltage, Darlington Connection (ISW = 1.0A, Pins 1, 8 connected) Saturation Voltage (Note 3) (ISW = 1.0 A, RPins 8 = 82 W to VCC, Forced b 20) DC Current Gain (ISW = 1.0 A, VEC = 5.0 V, TA = 25C) Collector Off - State Current (VCE = 40 V) VCE(sat) VCE(sat) hFE IC(Off) - 1.0 1.3 V 50 - 0.45 75 40 0.7 100 V A COMPARATOR Threshold Voltage TA = 25C TA = TIOW to Thigh Threshold Voltage Line Regulation (VCC = 3.0V to 40V) Input Bias Current (VIN = 0V) Vth 1.225 1.210 Regline IIB 1.25 1.4 -20 1.275 1.29 5.0 -400 V mV nA TOTAL DEVICE Supply Current (VCC = 5.0V to 40 V, CT = 1.0 nF, Pin 7 = VCC Vpin5 > Vth Pin 2 = GND remaining pins open) ICC - - 4.0 mA Note 2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. Note 3. If the output switch is driven into hard saturation (non-arlington configuration) at low switch currents ( 300 mA) and high driver currents ( 30 mA), it may take up to 2.0 ms for it to come out of saturation. This condition will shorten the off time at frequencies 30 kHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non-Darlington configuration is used, the following output drive condition is recommended: Forced b of output switch : IC output IC driver - 7.0 mA* 10 * The 100 W resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts. GM34063 4 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT Typical Performance Characteristics 2 1.8 VCE Saturation Voltage(V) ICC, Supply Current(mA) 3.6 3.2 2.8 2.4 2 1.6 1.2 0.8 0.4 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 Figure 1:Emitter Follows Configuration Output IE Emitter current (A) 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 VCC = 5V Pin1, 7, 8 =VCC Pin 3, 5 = GND TA = 25C CT = 1.0 nF Pin 7 = VCC Pin 2 = GND 0 5 10 15 20 25 30 35 40 VCC, Supply Voltage (V) Figure 2: Standley Supply Current Versus Supply Voltage VCE(sat) (mV) 1000 950 900 850 800 750 -40 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 Darlington Connection VEC(sat), Saturation Voltage (V) VCC = 5V IC = 1A VCC = 5V Pin 7 = VCC Pins 2, 3, 5 = GND TA= 25C 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 IC, Collector Current(A) 0 40 80 120 TJ (C) Figure 3: Common Emitter Configuration Output Switch Saturation Voltage versus Collector Current Figure 4: Darlington Configuration Collector Emitter Saturation Voltage (VCE(sat)) vs Temperature VIPK(sense), Current Limit Sense Voltage(V) 360 340 320 300 280 260 240 220 200 -55 -25 0 25 50 75 100 125 ton-off, Output Switch on-off Time(s) 400 V CC = 5.0V 380 I chg = Idischg 1000 V = 5.0V 500 CC Pin 7 = VCC 200 Pin 5 = GND TA = 25C 100 50 20 10 5.0 2.0 0 0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10 ton toff TA, Ambient Temperature(C) CT, Oscillator Timing Capacitor(nF) Figure 5: Current Limit Sense Voltage versus Temperature Figure 6: Output Switch On- Off Time versus Oscillator Timing Capacitor GM34063 5 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT Figure 7. External Current Boost Connections for IC Peak Greater than 1.5A Test Line Regulation Load Regulation Output Ripple Efficiency Output Ripple With Optional Fitter Conditions VIN = 8.0 V to 16 V, IO = 175 mA VIN = 12 V, IO = 75mA to 175 mA VIN = 12 V, IO =175 mA VIN = 12 V, IO = 175 mA VIN = 12 V, IO = 175 mA Results 30 mV = 0.05% 10mV = 0.017% 400 mVpp 87.7% 40 mVpp Step - Up Converter 170 H L 8 180 SQ R 7 RSC 0.22 VIN 12 V 6 + 100 5 R2 47k 2.2k R1 330 + CO VCC + - Comp. 1.25V Reference Regulator Ipk Osc. 100 CT 3 CT 1500pF 4 VOUT 28 V / 175 mA 1.0 H VOUT + 100 Q2 Q1 2 1N5819 1 Optional Filter GM34063 6 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT External Current Boost Connections for IC Peak Greater than 1.5A 8 Q2 Q1 1 VOUT S R 7 RSC VIN 6 Comparator + 5 Ipk Oscillator CT Q 2 3 1.25V Reference Regulator 4 Figure 6a. External NPN Switch If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents ( 300 mA) and high driver currents ( 30 mA), it may take up to 2.0 ms to come out of saturation. This condition will shorten the off time at frequencies 30 kHz, and is magnified at high temperatures. This condition does not occure with a Darlington configuration, since the output switch cannot saturate. If a non-Darlington configuration is used, the following output drive condition is recommended. 8 Q2 Q1 100 Ipk Oscillator CT 6 Comparator + 5 1.25V Reference Regulator 1 VOUT SQ R 7 RSC VIN 2 3 4R 0 for constant VIN Figure 6b. External NPN Switch GM34063 7 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT Figure 8. External Current Buck Connections for IC Peak Greater than 1.5A Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency Output Ripple With Optional Fitter Conditions VIN = 15 V to 25 V, IO = 500 mA VIN = 25 V, IO = 75mA to 500 mA VIN = 25 V, IO =500 mA VIN = 25 V, RL = 0.1W VIN = 25 V, IO = 500 mA VIN = 25 V, IO = 500 mA Results 12 mV = 0.15% 3.5mV = 0.03% 120 mVpp 1.1 A 83.7% 40 mVpp Step - Down Converter 8 1 SQ R 7 RSC 0.33 VIN 25 V 6 + 100 5 R2 3.6k 1.2k R1 Comp. VCC + Ipk Osc. Q2 Q1 100 2 CT 1N5819 L 3 CT 470pF 4 VOUT 5.0 V / 500 mA CO 1.0 H VOUT + 100 220 H 1.25V Reference Regulator 470 + Optional Filter GM34063 8 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT External Current Buck Connections for IC Peak Greater than 1.5A 8 1 SQ R 7 Q2 Q1 2 RSC VIN 6 Ipk Oscillator CT Comparator + 5 1.25V Reference Regulator 4 3 VOUT Figure 7a. External NPN Switch 8 1 SQ R 7 2 RSC VIN 6 Comparator + 1.25V Reference Regulator Ipk Oscillator CT 3 Q2 Q1 VOUT Figure 7b. External NPN Switch GM34063 9 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT Figure 9. External Current Boost Connections for IC Peak Greater than 1.5A Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency Output Ripple With Optional Fitter Conditions VIN = 4.5 V to 6.0 V, IO = 100 mA VIN = 5.0 V, IO = 10mA to 100 mA VIN = 5.0 V, IO =100 mA VIN = 5.0 V, RL = 0.1W VIN = 5.0 V, IO = 100 mA VIN = 5.0 V, IO = 100 mA Results 3.0 mV = 0.012% 0.022mV = 0.09% 500 mVpp 910mA 62.2% 70 mVpp Voltage Inverting Converter 8 S R 7 RSC 0.24 VIN 4.5V to 6.0V 6 + 100 5 VCC + Comp. 1.25V Reference Regulator 1 Q Q2 Q1 100 Ipk Osc. CT 2 88H L 1N5819 3 + 1500 pF 4 R1 953 1000F + CO VOUT -12 V / 100 mA 1.0 H VOUT 100 + 8.2k R2 Optional Filter GM34063 10 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT External Current Boost Connections for IC Peak Greater than 1.5A 8 1 S R 7 RSC VIN 6 Comparator + 5 Ipk Oscillator CT Q Q2 Q1 2 VOUT 3 1.25V Reference Regulator 4 Figure 8a. External NPN Switch 8 S R 7 RSC VIN 6 Comparator + 5 1.25V Reference Regulator Ipk Oscillator CT Q Q2 Q1 1 VOUT 2 3 Figure 8b. External NPN Switch GM34063 11 4 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT + +12V GND 8 1 + -12V S R 7 RSC VIN 6 Comparator + 5 Ipk Oscillator CT Q Q2 Q1 2 3 1.25V Reference Regulator 4 Figure 9. Dual Output Voltage + 8 1 + Q1 2 VOUT Isolated form input -VOUT S VIN R 7 Ipk Oscillator CT 6 Comparator + - Q Q2 RSC 3 1.25V Reference Regulator 4 GM34063 5 Figure 10. Higher Output Power, Higher Input Voltage 12 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT DESIGN FORMULAS Calculation ton / toff Step - Up Vout + VF - VIN(min) VIN(min) - Vsat 1 f ton + toff ton +1 toff (ton + toff) - ton 4.0 x 10 ton ton +1) toff -5 Step - Down Vout + VF VIN(min) - Vsat - Vout 1 f ton + toff ton +1 toff (ton + toff) - ton 4.0 x 10 ton 2 Iout(max) -5 Voltage - Inverting IVoutI + VF VIN - Vsat 1 f ton + toff ton +1 toff (ton + toff) - ton 4.0 x 10 ton 2 Iout(max)( ton +1) toff -5 (ton + toff) toff ton CT Ipk(switch) 2 Iout(max)( RSC L(min) 0.3/ Ipk(switch) 0.3/ Ipk(switch) 0.3/ Ipk(switch) ( (VIN(min) - Vsat) Ipk(switch) ) ton(max) Ioutton Vnpple(pp) ( (VIN(min) -Vsat- Vout) Ipk(switch) ) ton(max) ( (VIN(min) - Vsat) Ipk(switch) ) ton(max) Ioutton Vripple(pp) CO 9 Ipk(switch) (ton + toff) 8Vripple(pp) 9 Vsat = Saturation voltage of the output switch. VF = Forward voltage drop of the output rectifier. VIN - Nominal input voltage. Vout - Desired output voltage, Iout - Desired output current. fmin- Minimum desired output switching frequency at the selected values of VIN and IO. Vripple(pp)- Desired peak-to peak output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and load regulation. GM34063 13 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT SOP-8 PACKAGE OUTLINE DIMENSIONS 0 ~ 8 0.028 +0.013 -0.022 +0.33 -0.56 0.008 +0.0018 -0.0005 0.200 +0.05 -0.01 Pad Layout 0.060 1.52 0.710 0.236 0.008 5.990 +0.21 -0.20 +0.003 -0.004 0.275 7.0 0.155 4.0 0.154 PIN INDENT 3.91 0.1 0.024 0.6 0.050 1.270 Inches ( mm ) 0.191 +0.002 -0.004 +0.05 -0.10 4.850 0.063 0.005 1.600 0.130 0.057 NOM 1.450 NOM ( Inches ) mm 0.007 0.003 0.175 0.075 0.050 NOM 1.270 NOM 0.016 +0.004 -0.003 +0.10 -0.08 0.410 DIP-8 PACKAGE OUTLINE DIMENSIONS 0.26 0.006 6.60 +0.15 -0.16 0.30 7.62 +0.010 -0.015 +0.25 -0.38 0.36 0.01 9.14 +0.25 -0.26 0.01 0.25 0.365 0.02 9.27 0.51 +0.002 -0.003 +0.05 -0.08 GM34063 0.13 3.30 +0.002 -0.006 +0.05 -0.15 0.180 MAX 4.570 MAX 0.015 MIN 0.380 MIN 0.125 MIN 3.180 MIN 0.018 0.004 0.46 0.10 0.039 0.07 0.99 0.18 0.06 0.01 1.52 +0.26 -0.25 0.100 NOM 2.540 NOM 0.021 0.005 0.53 +0.12 -0.13 ( Inches ) mm 14 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT ORDERING NUMBER GM 34063 S8 R Gamma Micro. Shipping T: Tube R: Tape & Reel Circuit Type Package S8: SOP-8 D8: DIP-8 GM34063 15 Power Management MICROELECTRONICS A A GM34063 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT GM34063 16 |
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