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PJ34063 DC-To-DC Converter Controller
T
he PJ34063 Series is a monlthic control circuit containing the primary functions required for DC to of an internal limit This in
Pin : 1. Switch Collector 3. Timing Capacitor 5. Comparator Inverting Input 7. IPK Sense 2. Switch Emitter 4. Gnd 6. Vcc 8. Driver Collector DIP-8 SOP-8
DC onverters. These devices consist duty cycle oscillator with an circuit, drive and a series step-up, with a
active current
high current output switch.
was specifically designed to be incorporated
step-down and voltage-inverting applications minimum number of external components.
temperature compensated reference,comparator,controlled.
FEATURES
· · · Operation from 3 to 40V input Low standby current Current limiting Output switch current to 1.5A Precision 2% reference Output - voltage adjustable Frequency of operation from 100Hz to 100KHz PJ34063CD PJ34063CS Device Operating temperature (Ambient) -20+85 DIP-8 SOP-8 Packagge
ORDERING INFORMATION
·
· · ·
BLOCK DIAGRAM
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PJ34063 DC-To-DC Converter Controller
ABSOLUTE MAXIMUM RATINGS Characteristic
Power Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage Switch Collector to Emitter Voltage Driver Collector Voltage Drive Collector Current (Note 1) Switch Current Operating Junction Temperature Operating Ambient Temperature Range Storage Temperature Range
Symbol
VCC VIR VC(SW) VE(SW) VCE(SW) VC(drive) IC(drive) Isw TJ TA Tstg
Value
40 -0.3 ~ +40 40 40 40 40 100 1.5 0 to +125 -20 to +85 -25 to +150
Unit
Vdc Vdc Vdc Vdc Vdc Vdc mA A
ELECTRICAL CHARACTERISTICS
(VCC = 5.0V. Ta= Tlow to Thigh. unless otherwise specified)
Characteristic
OSCILLATOR Frequency Charging Current Discharge Current Discharge To Charge Current Ratio Current Limit Sense Voltage OUTPUT SWITCH(NOTE 2) Saturation Voltage , Darlington Connection Saturation Voltage , Darlington Connection DC Current Gain Collector Off- State Current COMPARATOR Threshold Voltage Threshold Voltage Line Regulation Input Bias Current TOTAL DEVICE Supply Current
Symbol
fosc Ichg Idischg Idischg/Ichg VIPK(sense) VCE(sat) VCE(sat) hFE IC(off) VTH Regline IIB ICC
Test Condition
VPIN5=0V, CT=1.0nF , TA=25 VCC=5 to 40V, TA=25 VCC=5 to 40V, TA=25 Pin7 to VCC , TA=25 Ichg = Idischg, TA=25 Isw=1.0A, Pins1,8 connected Isw=1.0A, RPIN8=82 to Vcc, Forced 20 Isw=1.0A, VCE = 5.0V, TA=25 VCE =40V TA=25 VCC = 3 to 40V VIN=0V
Min
24 24 140 5.2 250 50 1.23
Typ
33 35 220 6.5 300 1.0 0.45 75 40 1.25 1.4 -20
Max
42 42 260 7.5 350 1.3 0.7 100 1.27 5.0 -400
Unit
KHz A A mV V V A V mV nA
VCC=5 to 40V, CT=1.0nF, 4.0 mA Pin7=Vcc ,VPIN 5>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.
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PJ34063 DC-To-DC Converter Controller
FIGURE 1.OUTPUT SWITCH ON-OFF TIME versus OSCILLATOR TIMING CAPACITOR FIGURE 2.TIMING CAPACITOR WAVEFORM
FIGURE 3.EMITTER FOLLOWER CONFIGURATION OUTPUT SATURATION VOLTAGE versus EMITTER CURRENT
FIGURE 4.COMMON EMITTER CONFIGURATION OUTPUT SWITCH SATURATION VOLTAGE versus COLLECTOR CURRENT
FIGURE 5.CURRENT LIMIT SENSE VOLTAGE versus TEMPERATURE
FIGURE 6.STANDBY SUPPLY CURRENT versus SUPPLY VOLTAGE
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PJ34063 DC-To-DC Converter Controller
FIGURE 1.STEP-UP CONVERTER
FIGURE 2.EXTERNAL CURRENT BOOST CONNECTIONS FOR Ic PEAK GREATER THAN 1.5A 2a.EXTERNAL NPN SWITCH 2b.EXTERNAL NPN SATURATED SWITCH
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PJ34063 DC-To-DC Converter Controller
FIGURE 3.STEP-DOWN CONVERTER
FIGURE 4.EXTERNAL CURRENT BOOST CONNECTIONS FOR Ic PEAK GREATER THAN 1.5A 4a.EXTERNAL NPN SWITCH 4b.EXTERNAL NPN SWITCH
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FIGURE 5.VOLTAGE INVERTING CONVERTER
FIGURE 6.EXTERNAL CURRENT BOOST CONNECTIONS FOR Ic PEAK GREATER THAN 1.5A 6a.EXTERNAL NPN SWITCH 6b.EXTERNAL NPN SATURATED SWITCH
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PJ34063 DC-To-DC Converter Controller Table : Design Formula
Calculation ton toff (ton+toff) max CT Ipk(switch) Rsc L (min) Step-Up Vout+VF -Vin(min) VCC(min)-Vsat Step-Down VOUT+VF VCC-Vsat-VOUT Voltage-Inverting Vout +VF VCC + Vsat
1 f min
4.0×10-5 ton 2Iout(max)
1 f min
4.0×10-5 ton 2Iout(max) 0.3/IPK(switch) Vin (min) - Vsat - Vout ton(max) Ipk ( switch )
1 f min
4.0×10-5 ton 2Iout(max)
ton toff + 1
ton + 1 toff
0.3/IPK(switch) Vin(min) - Vsat Ipk ( switch) ton(max)
0.3/IPK(switch)
Vin(min) - Vsat Ipk ( switch) ton(max)
Co
Ioutton Vripple( pp )
Ipk ( switch)(ton + toff ) 8Vripple( pp )
Ioutton Vripple( pp )
TERMS AND DEFINITIONS Vsat = Saturation Voltage of the output switch.
VF = Forward Voltage drop of the rectifier. Vin= Normal input voltage Vout: Desied Output voltage, |Vout|=1.25 (1+ Iout : Desired output current. fmin : Minimum desired output switching frequency at the selected values for Vin and.Io. Vripple(p-p): Desired peak-to-peak output ripple voltage. in practice, the calculated capaitor 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.
The following power supply characteristics must be chosen:
R2 ) R1
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PJ34063 DC-To-DC Converter Controller
DIP-8 Mechanical drawing
DIM A B C D G J K L M
DIP-8 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 9.07 8.75 0.357 0.367 6.22 4.00 0.245 0.255 3.18 1.75 0.125 0.135 0.35 0.49 0.019 0.020 2.54BSC 0.10BSC 0.29 0.31 0.011 0.012 3.25 3.35 0.128 0.132 7.75 8.00 0.305 0.315 10° 10° -
SOP-8 Mechanical drawing
DIM A B C D F G K M P R
SOP-8 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 4.80 5.00 0.189 0.196 3.80 4.00 0.150 0.157 1.35 1.75 0.054 0.068 0.35 0.49 0.014 0.019 0.40 1.25 0.016 0.049 1.27BSC 0.05BSC 0.10 0.25 0.004 0.009 0° 7° 0° 7° 5.80 6.20 0.229 0.244 0.25 0.50 0.010 0.019
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