DC-TO-DC CONVERTER CONTROL CIRCUITS KGM34063AS The KGM34063AS is a monolithic control circuit containing the primary functions required for DC-to-DC converters. These 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. This series was specifically designed to be incorporated in Step-Down and Step-Up and Voltage-Inverting applications with a minimum number of external components. FEATURES • • • • • • • FUNCTIONAL BLOCK DIAGRAM Operation from 3.0 V to 40 V Input Low Standby Current Current Limiting Output Switch Current to 1.5 A Output Voltage Adjustable Frequency Operation to 100 kHz Precision 2% Reference MAXIMUM RATINGS Rating Power Supply Voltage Comparator Input Voltage Range Symbol VCC VIR Switch Collector Voltage Switch Emitter Voltage (Vpin 1 = 40 V) Switch Collector to Emitter Voltage Driver Collector Voltage Driver Collector Current (Note 1) Switch Current Power Dissipation and Thermal Characteristics Ceramic Package, U Suffix TA = +25°C Thermal Resistance Plastic Package, P Suffix TA = +25°C Thermal Resistance SOIC Package, D Suffix TA = +25°C Thermal Resistance Operating Junction Temperature Operating Ambient Temperature Range Storage Temperature Range VC(switch) VE(switch) VCE(switch) IC(driver) IC(driver) ISW PD RθJA PD RθJA PD RθJA TJ TA Tstg Value 40 -0.3 to +40 40 40 40 40 100 1.5 Unit Vdc Vdc Vdc Vdc Vdc Vdc mA A 1.25 100 1.25 100 625 160 +150 0 to +70 -65to+150 W °C/W W °C/W mW °C/W °C °C °C DC-TO-DC CONVERTER CONTROL CIRCUITS ORDERING INFORMATION Device Temperature Range KGM34063ASD 0° to +70°C KGM34063ASN 0° to +70°C KGM34063AS Package SO-8 Plastic DIP ELECTRICAL CHARACTERICISTICS (VCC = 5.0 V, TA= 0 to +70oC unless otherwise specified.) Characteristics Symbol OSCILLATOR Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C) fosc Charge Current (VCC = 5.0 V to 40 V, TA = 25°C) Ichg Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C) Idischg Discharge to Charge Current Ratio (Pin7 to Vcc, TA=25°C) Idischg/Ichg Current Limit Sense Voltage (Ichg = Idischg, TA = 25°C) Vlpk(sense) OUTPUT SWITCH (Note 3) Saturation Voltage, Darlington Connection (ISW = 1.0 A, Pins VCE(sat) 1, 8 connected) VCE(sat) Saturation Voltage (ISW = 1.0 A, RPin 8 = 82 Ω to VCC. Forced β = 20) DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C) hFE Collector Off-State Current (VCE = 40V) IC(off) COMPARATOR Threshold Voltage (TA = 25°C) Vth (TA = TLOW to THIGH) Threshold Voltage (TA = 25°C) ** Vth Regline IIB TOTAL DEVICE Supply Current (VCC = 5 0 V to 40 V, CT = 1 0 nF, Vpin7 = ICC Threshold Voltage Line Regulation (VCC = 3 0 V to 40 V) Input Bias Current (Vin=0V) VCC. VPin5 > Vth, Pin 2 = Gnd, Remaining pins open) Min Typ Max Unit 24 24 140 5.2 250 33 33 200 6.2 300 42 42 260 7.5 350 kHz μA μA — mV — 1.0 1.3 V — 0.45 0.7 V 50 — 120 0.01 — 100 — μA 1.225 1.21 1.2375 1.25 — 1.25 1.275 V 1.29 1.2625 V — 1.4 -40 5.0 -400 mV nA 2.5 4.0 mA NOTES: 1. Maximum package power dissipation limits must be observed. 2. Low duty cycle pulse techniques are used during test to maintain Junction temperature as close to ambient temperature as possible 3. 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 μs 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 β of output switch = IC, output/(Ic, driver -7.0 mA*) > 10 *The 100 Ω. resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts **Possible version for shipment 2 А4 DC-TO-DC CONVERTER CONTROL CIRCUITS KGM34063AS TYPICAL APPLICATION CIRCUIT Step-Up Converter L1 170μH R3 8 DRC SWC Ipk SWE 1 180Ω 7 2 D1 BYV10-40 R SG 6 Vcc TC 3 0.22Ω V IN 5 Cll GND 12V C3 + C2 V OUT 4 34063A/E 100 μF R1 R2 2.2kΩ 47kΩ 1.5nF C3 + 330μF Test Condition (VOUT = 28 V) Test Conditions Line Regulation VIN = 8 to 16 V, IO = 175 mA Load Regulation VIN = 12 V, IO = 75 to 175 mA Output Ripple VIN = 12 V, IO = 175 mA Efficiency VIN = 12 V, IO = 175 mA Value (Typ) 30 10 300 89 Unit mV mV mV % 3 А4 DC-TO-DC CONVERTER CONTROL CIRCUITS KGM34063AS Step-Down Converter 8 DRC SW C 1 BYV10-40 R SC 0.33Ω 7 Ipk SW E 2 D1 6 5 C2 Vcc TC Cll GND 3 4 L1 220μH C3 + 100 μF 34063A/E R1 R2 1.2kΩ 3.6kΩ 470pF C1 + 470μF Test Condition (VOUT = 5 V) Test Conditions Line Regulation VIN = 15 to 25 V, IO = 500 mA Load Regulation VIN = 25 V, IO = 50 to 500 mA Output Ripple VIN = 25 V, IO = 500 mA Efficiency VIN = 25 V, IO = 500 mA ISC VIN = 25 V, RLOAD = 0.1 Ω Value (Typ) 5 30 100 80 1.2 Unit mV mV mV % A 4 А4 DC-TO-DC CONVERTER CONTROL CIRCUITS KGM34063AS Voltage Inverting Converter 8 DRC SWC 1 L1 7 R3 Ipk SWE 2 0.22Ω 90μH 6 VIN 5 TC Vcc Cll GND 3 4 D1 BYV10-40 4.5 to 6V C2 + 34063A/E 100μF R2 8.2kΩ C3 1.5nF VOUT R1 953Ω -12V / 100mA C1 + Test Condition (VOUT = -12 V) Test Conditions Line Regulation VIN = 4.5 to 6 V, IO = 100 mA Load Regulation VIN = 5 V, IO = 10 to 100 mA Output Ripple VIN = 5 V, IO = 100 mA Efficiency VIN = 5 V, IO = 100 mA ISC VIN = 5 V, RLOAD = 0.1 Ω Value (Typ) 15 20 230 58 0.9 1000μF Unit mV mV mV % A 5 А4 DC-TO-DC CONVERTER CONTROL CIRCUITS Calculation Parameter ton/toff (ton + toff)max CT IPK(switch) RSC CO L(min) Step-Up (Discontinuous mode) Vout +VF-V in(min) Vin(min) - Vsat 1/fmin 4.5x10-5ton 2Iout(max)[(ton/toff)+1] 0.3/IPK(switch) Ioutton ≡ Vripple(p-p) Vin(min) - Vsat ton(max) IPK(switch) KGM34063AS Step-Down (Continuous mode) Vout +VF Vin(min) - Vsat - Vout 1/fmin 4.5x10-5ton 2Iout(max) 0.3/IPK(switch) IPK(switch) (ton + toff) 8Vripple(p-p) Vin(min)-Vsat-Vout ton(max) IPK(switch) Voltage Inverting (Discontinuous mode) ⎢Vout ⎢+ VF Vin - Vsat 1/fmin 4.5x10-5ton 2Iout(max)[(ton/toff)+1] 0.3/IPK(switch) Ioutton ≡ Vripple(p-p) Vin(min) - Vsat ton(max) IPK(switch) NOTES: Vsat = Saturation voltage of the output switch VF = Forward voltage drop of the output rectifier THE FOLLOWING POWER SUPPLY CHARACTERISTICS MUST BE CHOSEN: Vin = Nominal input voltage Vout = Desired output voltage, ⎢Vout ⎢ = 1.25(1+R2/R1) Iout = Desired output current fmin = Minimum desired output switching frequency at the selected values of Vin and lo Vripple = Desired peak to peak output ripple voltage. In practice, the calculated capacitor value will and 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. Step-up With External NPN Switch VOUT 8 1 S Q + Q1 R 2 7 RSC VIN 6 Comparator + - Ipk Oscillator 3 1.25V Reference Regulator 4 5 6 А4 DC-TO-DC CONVERTER CONTROL CIRCUITS KGM34063AS Step-down With External NPN Switch 8 1 S Q Q2 Q1 R 2 7 RSC VIN Ipk Oscillator 6 VOUT 3 + Comparator 1.25 V Reforence Regulator 4 5 Step-down With External PNP Switch 8 1 S Q Q2 Q1 R VOUT 2 + 7 RSC VIN 6 Ipk Oscillator 3 1.25 V Reference Regulator 4 Comparator 5 7 А4 DC-TO-DC CONVERTER CONTROL CIRCUITS KGM34063AS Voltage Inverting With External NPN Switch 8 1 S Q Q2 Q1 R 2 7 VOUT RSC VIN Ipk Oscillator 6 3 + Comparator 1.25 V Reference Regulator 4 5 Voltage Inverting With External PNP Saturated Switch 8 1 S Q Q2 VOU T Q1 R 2 + 7 RSC VIN 6 Ip k Oscillator 3 1 .2 5 V R e fo r e n ce Regulator 4 Comparator 5 8 А4 DC-TO-DC CONVERTER CONTROL CIRCUITS KGM34063AS Dual Output Voltage +12V + GND + 8 1 S Q Q2 -12V Q1 R 2 7 RSC VIN 6 Ipk Oscillator 3 1.25 V Reforence Regulator 4 Comparator 5 9 А4 DC-TO-DC CONVERTER CONTROL CIRCUITS KGM34063AS Higher Output Power, Higher Input Voltage +VOUT + Isolated from input -VOUT + 8 S Q 1 Q2 Q1 R VIN 2 7 RSC 6 Ipk Oscillator 3 1.25 V Reforence Regulator 4 Comparator + - 5 10 А4 DC-TO-DC CONVERTER CONTROL CIRCUITS KGM34063AS 05 04 06 03 9 8 7 6 5 4 3 10 11 12 2 1 07 02 08 01 Bonding diagram of KGM34063AS 11 А4 DC-TO-DC CONVERTER CONTROL CIRCUITS KGM34063AS Pad size 05 - 08 not for bonding Pads location of KGM34063AS 12 А4 DC-TO-DC CONVERTER CONTROL CIRCUITS KGM34063AS Die size Хr = 1.50mm, Уr =1.51mm Coordinates of pads No of pad 01 02 03 04 05٭ 06٭ 07٭ 08٭ 09 10 11 12 Coordinates left bottom, mm X 0,075 0,652 0,956 1,337 1,320 1,320 1,320 1,318 1,305 0,863 0,577 0,075 Pad size, mm Y 0,564 0,075 0,075 0,075 0,665 0,788 0,921 1,039 1,230 1,345 1,345 1,345 0,090×0,220 0,220×0,090 0,090×0,090 0,090×0,150 0,072×0,072 0,072×0,072 0,072×0,072 0,074×0,074 0,074×0,074 0,090×0,090 0,090×0,090 0,090×0,090 ٭technological pads DESCRIPTION Pin No of pad Symbol Function 01 01 C Switch Collector 02 02 E Switch Emitter 03 03 CT 04 04 GND 05 09 IN 06 10 Vcc Supply Voltage 07 11 CO Ipk Sense 08 12 DC Driver Collector Timing Capacitor Ground Comparator Inverting Input 13 А4