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| TMC DESCRIPTION TD34063 DC TO DC CONVERTER CONTROLLER T he TD34063 Series is a monolithic control circuit containing the primary functions required for DC to DC converters. T hese devices , consist of an internal temperature compensated reference, comparator controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. T his series was specifically designed to be incorporated in Step-Down and Step-Up and Voltage-Inverting applications with a minimum number of external components. SOP-8 FEATURES *Operation from 3.0V to 40V. *Short circuit current limiting. *Low standby current. *Output switch current of 1.5A without external transistors. *Frequency of operation from 100Hz to 100kHz. *Step-up, step-down or inverting switch regulators. DIP-8 BLOCK DIAGRAM E SWITCH COLLECTOR T2 S Q R T1 SWITCH EMITTER D C Is A TIMING CAPACITOR CT OSCILLATOR 1 8 DRIVE COLLECTOR 2 7 Ipeak SENSE 3 6 Vcc COMP. GND 4 1.25Vref B 5 COMPARATOR INVERTING INPUT PIN CONFIGURATION Switch Collector Switch Emitter Timing Capacitor 1 8 Driver Collector 2 7 Ipk Sense 3 6 Vcc Gnd 4 5 Comparator Inverting input ORDERING INFOR MATION Device TD34063 TD34063 Operating Temperature Range TA = 0C to +70C TA = 0C to +70C Package PDIP-8 SOP-8 1 TD34063 ELECTRICAL CHARACTERISTICS(VCC=5.0V, TA = Tlow to Thigh [Note 3], unless otherwise specified.) Characteristics Symbol OSCILLATOR fosc Frequency (Vpin5 = 0 V, CT = 1.0nF, TA = 25C) lchg Charge Current (VCC =5.0 V to 40 V, TA = 25C) ldischg Discharge Current (VCC =5.0 V to 40 V, TA = 25C ) Discharge to Charge Current Ratio (Pin7 to VCC, TA = 25C) ldischg / lchg Vipk(sense) Current Limit Sense Voltage (Ichg = ldischg, TA = 25 C) OUTPUT SWITCH (Note 4) Saturation Voltage, Darlington Connection (Note 5) VCE(sat) (ISW = 1.0 A, Pins 1,8 connected) Saturation Voltage, Darlington Connection VCE(sat) (ISW = 1.0 A, Rpin 8 = 82 to VCC, Forced = 20) hFE DC Current Gain (ISW = 1.0 A, VCE =5.0 V, TA = 25C) Collector Off-State Current (VCE = 40 V) IC(off) COMPARATOR Threshold Voltage TA = 25 C Vth Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V) Input Bias Current (Vin = 0 V) TOTAL DEVICE Supply Current (VCC = 5.0 V to 40 V, CT = 1.0 nF, Pin 7 = VCC, Vpin 5 > Vth, Pin 2 = Gnd, remaining pins open) Regline IIB ICC Min 24 22 140 5.2 250 50 Typ 33 33 200 6.2 300 1.0 0.45 120 0.01 Max 42 42 260 7.5 350 1.3 0.7 100 Unit kHz uA uA mV V V uA 1.23 - 1.25 1.27 1.4 -40 2.5 5.0 -400 4.0 V mV nA mA MAXIMUM RATINGS Rating Symbol Value Unit Power Supply Voltage VCC 40 V Comparator Input Voltage Range VIR -0.3 to +40 V Switch Collector Voltage VC(switch) 40 V Switch Emitter Voltage (Vpin 1 = 40 V) VE(switch) 40 V Switch Collector to Emitter Voltage VCE(switch) 40 V Driver Collector Voltage VC(driver) 40 V Driver Collector Current (Note 1) IC(driver) 100 mA Switch Current ISW 1.5 A Power Dissipation and Thermal Characteristics PD 1.0 W TA = 25 C 100 C / W R JA Thermal Resistance Operating Junction Temperature TJ +150 C Operating Ambient Temperature Range TA 0 to +70 C Storage Temperature Range Tstg -65 to +150 C NOTE : 1. Maximum package power dissipation limits must be observed. 2. ESD data available upon request. 3. Tlow = 0 C , Thigh = +70 C 4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. 5.If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents ( 300mA) and high driver currents ( 30mA), it may take up to 2.0uS for it to come out of saturatiion. This condition will shorten the off time at frequencies 30kHz, 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 of output switch: *The 100 resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts. TMC 2 TD34063 TYPICAL PERFORMANCE CHARACTERISTICS Output Switch ON-OFF Time vs. Oscillator Timing Capacitor tON-OFF Output Switch ON-OFF Time ( S) 1000 Standby Supply Current vs. Supply Voltage 2 ICC, Supply Current (mA) VCC=5V VIPK=VCC PIN 5=GND ON TIME 1.6 1.2 CT=1nF VIPK=VCC PIN 2=GND 100 0.8 10 OFF TIME 0.4 1 0.1 1 10 100 0 0 5 10 15 20 25 30 CT, Oscillator Timing Capacitor (nF) VCC, Supply Voltage (V) VFB, Threshold Voltage vs Temperature 1.3 IPK Threshold Voltage vs Temperature 350 VIPK, Threshold Voltage (mV) VFB, Threshold Voltage (V) 1.28 VCC = 5V, CT = 1nF PIN 2 = GND 340 330 320 310 300 290 280 270 260 VCC = 5V CT = 1nF PIN 5 = GND 1.26 1.24 1.22 1.2 250 0 10 20 30 40 50 60 70 80 0 10 20 30 40 50 60 70 80 Temperature ( C) Temperature (C) Emitter-Follower Configuration Output Switch Saturation Voltage vs Emitter Current 1.8 Common-Emitter Configuration Output Switch Saturation Voltage vs Collector Current 1.4 VCE(SATE) Saturation Voltage (V) 1.7 VCE(SAT), Saturation Voltage (V) VCC = 5V PIN 1, 7, 8 = VCC PIN 3, 5 = GND 1.2 1.0 0.8 0.6 0.4 VCC = 5.0V VCC = 5V PIN 7 =VCC PIN 7 = VCC PINS 2, 3, 5 = GND PIN 2, 3, 5 = GND Forced Beta = 20 Darlington Connection 1.6 1.5 1.4 Forced Beta = 20 0.2 0 1.3 1.2 0 0.5 1 1.5 0 0.5 1 1.5 IE, Emitter Current (A) IC, Collector Current (A) Note 4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. TMC 3 TD34063 Figure 1. Voltage Inverting Converter Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency Output Ripple With Optional Filter Condition Vin = 4.5 V to 6.0 V, Io = 100 mA Vin = 5.0 V, Io = 10 mA to 100 mA Vin = 5.0 V, Io = 100 mA Vin = 5.0 V, RL = 0.1 Vin = 5.0 V, Io = 100 mA Vin = 5.0 V, Io = 100 mA Results 3.0 mV = 0.012% 0.022 V = 0.09% 500 mVpp 910 mA 62.2% 70 mVpp Figure 2. External Current Boost Connections for Ic Peak Greater than 1.5 A 2a. External NPN Switch 2b. External PNP Saturated Switch TMC 4 TD34063 Figure 3. Step-Down Converter Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency Output Ripple With Optional Filter Condition Vin = 15 V to 25 V, Io = 500 mA Vin = 25 V, Io = 50 mA to 500 mA Vin = 25 V, Io = 500 mA Vin = 25 V, RL = 0.1 Vin = 25 V, Io = 500 mA Vin = 25 V, Io = 500 mA Results 12 mV = 0.12% 3.0 mV = 0.03% 120 mVpp 1.1 A 83.7% 40 mVpp Figure 4. External Current Boost Connections for Ic Peak Greater than 1.5 A 4a. External NPN Switch 4b. External PNP Saturated Switch TMC 5 TD34063 Figure 5. Step-Up Converter Test Line Regulation Load Regulation Output Ripple Efficiency Output Ripple With Optional Filter Condition Vin = 8.0 V to 16 V, Io = 175 mA Vin = 12 V, Io = 75 mA 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% 10 mV = 0.017% 400 mVpp 87.7% 40 mVpp Figure 6. External Current Boost Connections for Ic Peak Greater than 1.5 A 6a. External NPN Switch 6 b. External NPN Saturated Switch (See Note 5 ) Note 5: 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 us 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. TMC 6 Package Information Plastic DIP Outline Dimensions 8-pin DIP (300mil) Outline Dimensions A B 1 8 5 4 H C D E . G = I Symbol A B C D E F G H I a Dimensions in mil Min. 355 240 125 125 16 50 3/4 295 335 0 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 100 3/4 3/4 3/4 Max. 375 260 135 145 20 70 3/4 315 375 15 Package Information SOP Outline Dimensions 8-pin SOP (150mil) Outline Dimensions A 1 8 5 B 4 C C' G D E . H = Symbol A B C C D E F G H a Dimensions in mil Min. 228 149 14 189 53 3/4 4 22 4 0 Nom. 3/4 3/4 3/4 3/4 3/4 50 3/4 3/4 3/4 3/4 Max. 244 157 20 197 69 3/4 10 28 12 10 Package Information Carrier Tape Dimensions D E . P0 P1 t W C B0 D1 P K0 A0 SOP 8N Symbol W P E F D D1 P0 P1 A0 B0 K0 t C Description Carrier Tape Width Cavity Pitch Perforation Position Cavity to Perforation (Width Direction) Perforation Diameter Cavity Hole Diameter Perforation Pitch Cavity to Perforation (Length Direction) Cavity Length Cavity Width Cavity Depth Carrier Tape Thickness Cover Tape Width Dimensions in mm 12.0+0.3 -0.1 8.00.1 1.750.1 5.50.1 1.550.1 1.5+0.25 4.00.1 2.00.1 6.40.1 5.200.1 2.10.1 0.30.05 9.3 |
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