34063 Datasheet PDF - Estek Electronics

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34063
Estek Electronics

Part Number 34063
Description monolithic control circuit containing the primary functions required
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34063
Description
The MC34063A 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. This series was specifically designed to be
incwowrpwo.drataesdheinetS4ute.cpo-mDown 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
Plastic Package
Pin Connections
Internal Block Digram
Driver 8
Collector
Ipk 7
Sense
VCC
Comparator
Inverting
Input
6
5
SQ
R
1 Switch
Collector
Q2
Q1
Ipk
Oscillator
CT
Comparator
100
1.25 V
Reference
2 Switch
Emitter
3 Timing
Capacitor
4 Gnd
BEIJING ESTEK ELECTRONICS CO.,LTD
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Absolute Maximum Ratings
Symbol
Parameter
VCC Power Supply Voltage
VIR Comparator Input Voltage Range
www.dVaCt(aswsithche) et4u.coSmwitch Collector Voltage
VE(switch)
VCE(switch)
VC(driver)
IC(driver)
ISW
Switch Emitter Voltage (VPIN1 = 40 V)
Switch Collector to Emitter Voltage
Driver Collector Voltage
Driver Collector Current (Note 1)
Switch Current
TJ Operating Junction Temperature
TA Operating Ambient Temperature Range
Tstg Storage Temperature Range
34063
Maximum
40
-0.3 to +40
40
40
40
40
100
1.5
+150
0 to +70
-65 to +150
Units
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
mA
A
°C
°C
°C
Electrical Characteristics
(Vcc=5.0V, Ta=Tlow to Thigh , unless otherwise
specified)
Characteristics
OSCILLATOR
Frequency (Vpin5 = 0V, CT = 1.0 nF, TA = 25°C)
Charge Current(VCC = 5.0V to 40V, TA = 25°C)
Discharge Current (VCC = 5.0V to 40V, TA = 25°C)
Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25°C)
Current Limit Sense Voltage (Ichg = Idischg, TA = 25°C)
OUTPUT SWITCH (NOTE 2)
Saturation Voltage, Darlington Connection (ISW = 1.0 A, Pins 1, 8 connected)
Saturation Voltage, Darlington Connection (ISW = 1.0 A, Rpin 8 = 82to VCC , Forced β
DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C)
Collector Off-State Current (VCE = 40 V)
COMPARATOR
Threshold Voltage
(TA=25°C)
(TA =Tlow to Thigh)
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)
20)
Symbol Min Typ Max Units
fOSC
Ichg
Idischg
Idischg /
Ichg
Vipk(sence)
24 33
24 35
140 220
5.2 6.5
42
42
260
7.5
250 300 350
kHz
µA
µA
mV
VCE(sat)
VCE(sat)
hFE
IC(off)
– 1.0 1.3
– 0.45 0.7
50 75 –
– 40 100
V
V
µA
Vth
Regline
1.225 1.25 1.275
1.21 – 1.29
– 1.4 5.0
V
mV
IIB – -20 -400 nA
ICC – – 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
BEIJING ESTEK ELECTRONICS CO.,LTD
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Typical Performance Characteristics
34063
Figure 1. Output Switch On-Off Time versus
Oscillator Timing Capacitor
Figure 2. Timing Capacitor Waveform
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A
Figure 3. Emitter Follower Configuration Output
Saturation Voltage versus Emitter Current
versus
Figure 4. Common Emitter Configuration
Output Switch Saturation Voltage
Collector Current
Figure 5. Current Limit Sense Voltage
versus Temperature
Figure 6. Standby Supply Current versus
Supply Voltage
BEIJING ESTEK ELECTRONICS CO.,LTD
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Typical Applications Circuit
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34063
Figure 1. Step-Up Converte .r
Note: R to 0 for constant Vin
Figure 2a. External NPN Switch.
Figure 2b. External NPN Saturated Switch.
Figure 2. External Current Boost Connections for I eak Greater than
P 1.5 .A
BEIJING ESTEK ELECTRONICS CO.,LTD
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