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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 * * * * * * * 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
FUNCTIONAL BLOCK DIAGRAM
MAXIMUM RATINGS
Rating Power Supply Voltage Comparator Input Voltage Range 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 = +25C Thermal Resistance Plastic Package, P Suffix TA = +25C Thermal Resistance SOIC Package, D Suffix TA = +25C Thermal Resistance Operating Junction Temperature Operating Ambient Temperature Range Storage Temperature Range Symbol VCC VIR VC(switch) VE(switch) VCE(switch) IC(driver) IC(driver) ISW PD RJA PD RJA PD RJA
TJ
Value 40 -0.3 to +40 40 40 40 40 100 1.5 1.25 100 1.25 100 625 160 +150 0 to +70 -65to+150
Unit Vdc Vdc Vdc Vdc Vdc Vdc mA A W C/W W C/W mW C/W C C C
TA Tstg
DC-TO-DC CONVERTER CONTROL CIRCUITS
KGM34063AS
ORDERING INFORMATION Device Temperature Range KGM34063ASD 0 to +70C KGM34063ASN 0 to +70C
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 = 25C) fosc Charge Current (VCC = 5.0 V to 40 V, TA = 25C) Ichg Discharge Current (VCC = 5.0 V to 40 V, TA = 25C) Idischg Discharge to Charge Current Ratio (Pin7 to Vcc, TA=25C) Idischg/Ichg Current Limit Sense Voltage (Ichg = Idischg, TA = 25C) Vlpk(sense) OUTPUT SWITCH (Note 3) Saturation Voltage, Darlington Connection (ISW = 1.0 A, Pins VCE(sat)
1, 8 connected)
Min 24 24 140 5.2 250 -- -- 50 -- 1.225 1.21 1.2375 --
Typ 33 33 200 6.2 300 1.0 0.45 120 0.01 1.25 -- 1.25 1.4 -40 2.5
Max 42 42 260 7.5 350 1.3 0.7 -- 100
Unit kHz A A -- mV V V -- A
VCE(sat) Saturation Voltage (ISW = 1.0 A, RPin 8 = 82 to VCC. Forced = 20) DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25C) hFE Collector Off-State Current (VCE = 40V) IC(off) COMPARATOR Threshold Voltage (TA = 25C) Vth
(TA = TLOW to THIGH) Threshold Voltage (TA = 25C) **
Vth
1.275 V 1.29 1.2625 V 5.0 -400 4.0 mV nA mA
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)
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 s 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 of output switch = IC, output/(Ic, driver -7.0 mA*) > 10 *The 100 . resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts **Possible version for shipment
2
4
DC-TO-DC CONVERTER CONTROL CIRCUITS
KGM34063AS
TYPICAL APPLICATION CIRCUIT Step-Up Converter
L1 170H
R3 180
8
DRC
SWC
1
7
Ipk
SWE
2
D1 BYV10-40
RSG 0.22 VIN 12V C2 100 F +
6
Vcc
TC
3
5
Cll
GND
4 C3
VOUT
34063A/E
1.5nF
R1 2.2k
R2 47k C3 330F +
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 %
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4
DC-TO-DC CONVERTER CONTROL CIRCUITS
KGM34063AS
Step-Down Converter
8
DRC
SW C
1 BYV10-40
RSC 0.33
7
Ipk
SW E
2 D1
6
Vcc
TC
3
5 C2 100 F +
Cll
GND
4 C3
L1 220H
34063A/E
470pF
R1 1.2k
R2 3.6k C1 470F +
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
Value (Typ) 5 30 100 80 1.2
Unit mV mV mV % A
4
4
DC-TO-DC CONVERTER CONTROL CIRCUITS
KGM34063AS
Voltage Inverting Converter
8
DRC
SWC
1 L1
R3 0.22
7
Ipk
SWE
2 90H
6
Vcc
TC
3
VIN 4.5 to 6V C2 100F +
5
Cll
GND
4
D1 BYV10-40 C3 1.5nF
34063A/E
R2 8.2k
R1 953 +
VOUT -12V / 100mA C1 1000F
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
Value (Typ) 15 20 230 58 0.9
Unit mV mV mV % A
5
4
DC-TO-DC CONVERTER CONTROL CIRCUITS
KGM34063AS
Calculation Parameter ton/toff (ton + toff)max CT IPK(switch) RSC CO L(min) NOTES:
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)
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)
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
8
VOUT
SQ R
1
+
Q1
2
7
RSC VIN
6 Comparator
Ipk Oscillator 1.25V Reference Regulator
3
+
5
4
6
4
DC-TO-DC CONVERTER CONTROL CIRCUITS
KGM34063AS
Step-down With External NPN Switch
8 1
SQ R
Q2 Q1
2 7
RSC
Ipk Oscillator
3
VOUT +
VIN
6
Comparator 1.25 V Reforence Regulator 4
5
Step-down With External PNP Switch
8 1
SQ R
Q2 Q1
+ VOUT
2 7
RSC
Ipk Oscillator
3
VIN
6
Comparator 1.25 V Reference Regulator 4
5
7
4
DC-TO-DC CONVERTER CONTROL CIRCUITS
KGM34063AS
Voltage Inverting With External NPN Switch
8 1
SQ R
Q2 Q1
2 7
VOUT RSC
Ipk Oscillator 3
VIN
6
Comparator 1.25 V Reference Regulator 4
+
5
Voltage Inverting With External PNP Saturated Switch
8 1
S R
Q
Q2 Q1
VOU T
2 7
+
RSC
Ip k Oscillator
3
VIN
6
Comparator 1 .2 5 V R e fo r e n ce Regulator 4
5
8
4
DC-TO-DC CONVERTER CONTROL CIRCUITS
KGM34063AS
Dual Output Voltage
+12V
+
GND
8 1
+
SQ R
Q2 Q1
-12V
2 7
RSC
Ipk Oscillator
3
VIN
6
Comparator 1.25 V Reforence Regulator 4
5
9
4
DC-TO-DC CONVERTER CONTROL CIRCUITS
KGM34063AS
Higher Output Power, Higher Input Voltage
+VOUT
+
Isolated from input -VOUT
+
8
SQ R
Q2 Q1
1
VIN
7
2
RSC
6 Comparator + 5
Ipk Oscillator
3
1.25 V Reforence Regulator
4
10
4
DC-TO-DC CONVERTER CONTROL CIRCUITS
KGM34063AS
05
04
06
9 8 7 6 5 4 3
03
10
11
2
12
1
07
02
08
01
Bonding diagram of KGM34063AS
11
4
DC-TO-DC CONVERTER CONTROL CIRCUITS
KGM34063AS
Pad size 05 - 08 not for bonding
Pads location of KGM34063AS
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DC-TO-DC CONVERTER CONTROL CIRCUITS
KGM34063AS
Die size r = 1.50mm, r =1.51mm Coordinates of pads No of pad 01 02 03 04 05 06 07 08 09 10 11 12 technological pads 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 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 Pad size, mm
0,090x0,220 0,220x0,090 0,090x0,090 0,090x0,150 0,072x0,072 0,072x0,072 0,072x0,072 0,074x0,074 0,074x0,074 0,090x0,090 0,090x0,090 0,090x0,090
DESCRIPTION
Pin 01 02 03 04 05 06 07 08 No of pad 01 02 03 04 09 10 11 12 Symbol C E CT GND IN Vcc CO DC Switch Collector Switch Emitter Timing Capacitor Ground Comparator Inverting Input Supply Voltage Ipk Sense Driver Collector Function
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