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DC-To-DC Converter Control Circuits
DEC. 2009
Product Description
The GS34063 Series 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.
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Features
Operation from 3.0V to 40V Input Low Standby Current Current Limiting Output Switch Current to 1.5A Output Voltage Adjustable Frequency Operation to 100kHz Precision 2% Reference
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.
Applications
Battery Powered Applications Laptop/Notebook Computers Power Inverter (+ to -) or (- to +) Medical Instruments Interface Power Supplies Portable Instruments Cellular Phones/Radio
Block Diagram
VCC Switch Collector Driver Collector
6 1 8 2 3 7 CT Ipk
Comparator S Q Q2 Q1 R 100
Switch Emitter Timing Capacitor Ipk Sense
Oscillator
GS34063
1
+
Comparator Inverting Input GND
5 4
-
1.25V Reference Regulator
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Packages & Pin Assignments GS34063PF(SOP-8)
1 2
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Switch Collector Switch Emitter Timing Capacitor GND
5 6 7 8
Comparator Inverting Input VCC Ipk Sense Driver Collector
3 4
Ordering Information
Device
GS34063PF GS34063SF For additional available fixed voltages, please contact factory.
Package
DIP-8 SOP-8
Marking Information
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GS34063
2
Absolute Maximum Ratings
Symbol
VCC VIR VC(switch) VE(switch) VCE(switch) VC(driver) IC(driver) ISW PD
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Parameter
Power Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage (VPIN1=40V) Switch Collector to Emitter Voltage Driver Collector Voltage Driver Collector Current (Note 1) Switch Current Power Dissipation TA=25C Thermal Resistance(Junction to Case ) TA=25C Thermal Resistance(Junction to Ambient ) TA=25C Operating Junction Temperature Operating Ambient Temperature Range Storage Temperature Range SOP-8 DIP-8 SOP-8 DIP-8 SOP-8 DIP-8
Rating
40 -0.3 to +40 40 40 40 40 100 1.5 0.625 1.25 20 45 150 100 +150 0 to +70 -65 to +150
Unit
V V V V V V mA A W
Jc JA TJ TA TSTG
C/W
C/W C C C
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GS34063
3
Electrical Characteristics
Symbol Parameter Test Conditions Oscillator
FOSC ICHG IDISCHG IDISCHG / ICHG VIPK(SENCE)
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Min
Typ
Max
Unit
Frequency Charge Current Discharge Current Discharge to Charge Current Ratio Current Limit sense Voltage
Vpin5 =0V, CT=1.0nF, TA=25C VCC=5.0V to 40V, TA=25C VCC=5.0V to 40V, TA=25C Pin 7 to VCC, TA=25C ICHG=IDISCHG, TA=25C
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 Saturation Voltage, Darlington Connection DC Current Gain Collector Off-state Current ISW=1.0A, Pins 1, 8 connected ISW=1.0A, RPIN8=82 to VCC, Forced 20 ISW=1.0A, VCE=5.0V, TA=25C VCE=40V -1.0 1.3 V
VCE(sat)
VCE(sat)
--
0.45
0.7
V
HFE IC(off)
50 --
75 40
-100
-A
Comparator
VTH REG(LINE) IIB Threshold Voltage Threshold Voltage Line Regulation Input Bias Current TA=25C (TA=TLOW to THIGH) VCC=3.0V to 40V Vin=0V 1.225 1.21 --1.25 -1.4 -20 1.275 1.29 5.0 -400 V mV nA
Total Device
VCC=5.0V to 40V, CT=1.0nF, Pin 7=VCC, VPIN 5>VTH , Pin 2=GND, remaining pins open
ICC
Supply Current
--
--
4.0
mA
NOTE1:Maximum package power dissipation limits must be observed. NOTE2:Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
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GS34063
4
Typical Performance Characteristics
TON-OFF, OUTPUT SWITCH ON-OFF TIME (S)
200 Vcc=5.0 Pin 7=Vcc Pin 5= Gnd TA =25 foff fon
100 50 20 10 5.0 2.0 1.0
Vosc, OSCILLATOR VOLTAGE (V)
1000 500
0.010.02 0.05 0.1
0.2
0.5 1.0
2.0 5.0 10.0
Vcc=5.0 Pin 7 =Vcc Pin 2 =Gnd
Pins 1,5,8 =Open CT =1.0nF TA =25 10s/DIV
CT, OSCILLATOR TIMING CAPACITOR (nF)
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Figure 1. Output Switch On-Off Time Versus Oscillator Timing Capacitor
Figure 2 Timing Capacitor Waveform.
V CE (sat), SATUREATION VOLTAGE (V)
1.9
VCEsat,SATURATION VOLTAGE(V)
1.2 1.0 0.8 0.6 0.4 0.2 0 0.4 0.8 1.2 1.6
Ic, COLLECTOR CURRENT (A)
1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1
Vcc =5.0V Pin1, 7 ,8 =Vcc Pins3, 5 =Gnd TA =25
Darlington Connection
Vcc =5.0V Pin7=Vcc Pins2, 3, 5=Gnd TA=2.5
Forced =20
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 IE, EMITTER CURRENT (A)
Figure 3. Emitter Follower Configuration Output Saturation Voltage versus Emitter Current
Figure 4. Common Emitter Configuration Output Switch Saturation Voltage versus Collector Current
VIPK (sense) CURRENT LIMIT SENSE VOLTAGE (mV
360
ICC, SUPPLY CURRENT (mA)
340 320 300 280 260 240 220 200 0
Vcc=5.0 Ichg--Idischg
4.0 3.6 3.2 2.8 2.4 2.0 1.6 1.2 0.8 0.4
CT=1.0nF Pin 7 = VCC Pin 2 =Gnd
200 mV/DIV
25
50
75
100
00
5.0
10
15
20
25
30
35
40
Vcc, SUPPLY VOLTAGE (V)
TA, AMBIENT TEMPERATURE(C)
Figure 6. Standby Supply Current versus supply Voltage
Figure 5. Current Limit Sense Voltage versus Temperature
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GS34063
5
Typical Applications Circuit
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Step-Up Converter
VOUT
VOUT
8
1
8
1
7
RSC VIN
2
RSC
7
2
6 + 5 -
3
VIN
6 +
3
4
5
-
4
Step-Up With External NPN Switch
Step-Up With External NPN Saturated Switch (See Note 5 )
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GS34063
6
Typical Applications Circuit (Continued)
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Step-Down Converter
8
1
8
1
7
RSC VIN
2
VOUT
7
RSC
2
VOUT
6 + 5 -
3
VIN
6 +
3
4
5
-
4
Step-Down With External NPN Switch
Step-Down With External PNP Saturated Switch
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GS34063
7
Typical Applications Circuit (Continued)
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Voltage Inverting Converter
Voltage Inverting With External NPN Switch
Voltage Inverting With External NPN Saturated Switch
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GS34063
8
Typical Applications Circuit (Continued)
+12V GND -12V
+VOUT Isolated from inpu -VOUT 8 1
8
1
7 RSC 6 VIN + 5 -
2
RSC
7
2
3
VIN
6 +
3
4
5
-
4
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Dual Output Voltage
Higher Output Power , Higher Input Voltage
Design Formula Table
Calculation tON / tOFF Step-Up Step-Down Voltage-Inverting
VOUT + VF - VIN(MIN) VIN(MIN) - VSAT 1 fMIN 4.0 x 10-5 tON
VOUT + VF VIN(M IN) - VSAT - VOUT 1 fMIN 4.0 x 10-5 tON 1 fMIN 4.0 x 10-5 tON
(tON + tOFF)MAX CT
IPK(SWITCH) RSC L(MIN)
IOUT tON VRIPPLE (PP)
2 IOUT(MAX) 0.3 / IPK(SWITCH) 0.3 / IPK(SWITCH) 0.3 / IPK(SWITCH)
CO
Terms And Defintions
9
IPK(SWITCH)(tO tO 8 VPIPPLE (PP)
N+
F F)
9
IOUT tON VRIPPLE (PP)
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 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 low value since it will directly affect the line and load regulation.
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GS34063
9
VSAT:Saturation voltage of the output switch. VF:Forward voltage drop of the output rectifier.
Package Dimension
SOP-8 PLASTIC PACKAGE
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Dimensions
SYMBOL MIN
A A1 A2 b c D E E1 e L L1 L2 R R1 h 1 2
0.07 0.07 0.25 0 5 0 0.40 1.04 (TYP) 0.25 (TYP) 0.50 8 15 .003 .003 .010 0 5 0 1.35 0.10 1.25 0.31 0.17 4.90 (TYP) 6.00 (TYP) 3.90 (TYP) 1.27 (TYP) 1.27 .016 .041 (TYP) .010 (TYP) .020 8 15 -
Millimeters MAX
1.75 0.25 1.65 0.51 0.25
Inches MIN
.053 .004 .049 .012 .007 .193 (TYP) .236 (TYP) .154 (TYP) .050 (TYP) .050
MAX
.069 .010 .065 .020 .010
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10
GS34063
DIP-8 PLASTIC PACKAGE
A2
A
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E
Dimensions
SYMBOL
A A1 A2 B B1 C D E E1 e L E2
Millimeters MIN
3.710 0.510 3.200 0.380 1.524(BSC) 0.204 9.000 6.200 7.320 2.540(BSC) 3.000 8.400 3.600 9.000 .118 .331 0.360 9.400 6.600 7.920 .008 .354 .244 .288
A1
L
Inches MAX
4.310 3.600 0.570
MIN
.146 .020 .126 .015 0.060 (BSC)
MAX
.170 .142 .022
.142 .354
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11
GS34063
.100 (BSC)
C
.014 .370 .260 .312
NOTICE
Information furnished is believed to be accurate and reliable. However Globaltech Semiconductor assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Globaltech Semiconductor. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information without express written approval of Globaltech Semiconductor.
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CONTACT US
GS Headquarter 4F.,No.43-1,Lane11,Sec.6,Minquan E.Rd Neihu District Taipei City 114, Taiwan (R.O.C) 886-2-2657-9980 886-2-2657-3630 sales_twn@gs-power.com
Wu-Xi Branch No.21 Changjiang Rd., WND, Wuxi, Jiangsu, China (INFO. &. TECH. Science Park Building A 210 Room) 86-510-85217051 86-510-85211238 sales_cn@gs-power.com
RD Division 824 Bolton Drive Milpitas. CA. 95035 1-408-457-0587
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