ST MC34063A, MC34063E Service Manual

DC/DC CONVERTER CONTROL CIRCUITS
OUTPUT SWITCH CURRENT IN EXCESS
OF 1.5A
2% REFERENCE ACCURACY
LOW QUIESCENT CURRENT: 2.5mA (TYP.)
OPERATINGFROM3VTO40V
FREQUENCY OPERATION TO 100KHz
ACTIVE CURRENT LIMITING
MC34063A
MC34063E
The MC34063A/E series is a monolithic control circuit delivering the main functions for DC/DC voltage converting. The device contains an internal temperature compensated reference, comparator, duty cycle controlled oscillator with an active current limit circuit, driver and high current output switch. Output v oltage is adjustable through two external resistors with a 2% reference accuracy. Employing a minimum number of ex ternal components the MC34063A /E de vice s series is designed for Step-Down, Step-Up and Voltage-Inverting applications.
BLOCK DIAGRAM
DIP-8 SO-8
1/16March 2004
MC34063A/E
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
V
SWC
V
SWE
V V
I
DC
I
SW
P
TOT
T
T
STG
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
Power Supply Voltage
CC
Comparator Input Voltage Range
IR
Switch Collector Voltage Switch Emitter Voltage (V Switch Collector to Emitter Voltage
CE
Driver Collector Voltage
DC
SWC
=40V)
Driver Collector Current Switch Current Power Dissipation at TA= 25°C for DIP-8 1.25
for SO-8 0.625
Operating Junction Temperature
J
Storage Temperature Range Operating Ambient Temperature Range for AC and EC SERIES 0 to 70
OP
for EB SERIES -40 to 125
50 V
-0.3 to 40 V 40 V 40 V 40 V 40 V
100 mA
1.5 A W
150 °C
-40 to 150 °C
°Cfor AB SERIES -40 to 85
THERMAL DATA
Symbol Parameter DIP-8 SO-8 Unit
R
thj-amb
R
thj-case
(*) This value depends from thermal design of PCB on which the device is mounted.
Thermal Resistance Junction-ambient (*) Thermal Resistance Junction-case
100 160 °C/W
42 20 °C/W
CONNECTION DIAGRAM (top view)
PIN DESCRIPTION
Pin N° Symbol Name and Function
1 SWC Switch Collector 2 SWE Switch Emitter 3 TC Timing Capacitor 4 GND Ground 5 CII Comparator Inverting Input
2/16
6V 7I
CC
PK
8 DRC Voltage Driver Collector
Voltage Supply IPKSense
ORDERING CODES
TYPE DIP-8 SO-8 SO-8 (TAPE & REEL)
MC34063AB MC34063ABN MC34063ABD MC34063ABD-TR MC34063AC MC34063ACN MC34063ACD MC34063ACD-TR MC34063EB MC34063EBN MC34063EBD MC34063EBD-TR MC34063EC MC34063ECN MC34063ECD MC34063ECD-TR
(*) The "A" version is not recommended for new designs.
MC34063A/E
ELECTRICAL CHARACTERISTICS (Refer to the t es t circuits, VCC=5V,TA=T
LOW
to T
HIGH
, unless
otherwise specified, see note 2)
OSCILLATOR
Symbol Parameter Test Conditions Min. Typ. Max. Unit
f
OSC
I
CHG
I
DISCHG
I
DISCHG
I
CHG
V
IPK(sense)
Frequency V
=0V CT=1nF TA=25°C243342KHz
PIN5
Charge Current VCC= 5 to 40V TA=25°C 24334A Discharge Current VCC= 5 to 40V TA= 25°C 140 200 260 µA
/
Discharge to Charge Current Ratio
Current Limit Sense Voltage I
PIN 7 = V
CHG=IDISCHG
CC
TA= 25°C 5.2 6.2 7.5 µA
TA= 25°C 250 300 350 mV
OUTPUT S WITCH
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
CE(sat)
V
CE(sat)
Saturation Voltage, Darlington
ISW= 1 A PIN 7, 8 connected 1 1.3 V
Connection Saturation Voltage ISW=1A R
=82to V
PIN8
CC
0.45 0.7 V
Forced β ~20
h
I
C(off)
DC Current Gain ISW=1A VCE=5V TA= 25°C 50 120
FE
Collector Off-State Current VCE=40V 0.01 100 µA
COMPARATOR
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Reg
I
Threshold Voltage TA= 25°C 1.225 1.25 1.275 V
TH
T
A=TLOW
Threshold Voltage Line
line
Regulation Input Bias Current VIN= 0 V -5 -400 nA
IB
VCC=3to40V 1 5 mV
to T
HIGH
1.21 1.29
3/16
MC34063A/E
TOTAL DEVICE
Symbol Parameter Test Conditions Min. Typ. Max. Unit
I
V
START-UP
NOTES:
1) Maximum package power dissipation limit must beobserved.
2) T
LOW
3) If Darlington configuration is not used, care must be taken to avoid deep saturation of output switch. The resulting switch-off time may be adversely affected. In a Darlington configuration the following output driver condition is suggested: Forced * Current lessdue to a built in 1Kanti leakage resistor.
4) Start-up Voltage is the minimum PowerSupply Voltag e at which the internal oscillator b egins to work.
TYPICAL P E RFORMAN CE CHARACTE RISTICS
Supply Current VCC=5to40V
CC
Start-Up Voltage (Note 4) TA=25°C
=0°C,T
β of output current switch = I
= 70°C (AC and EC series); T
HIGH
COUTPUT
/(I
CDRIVER
C
=1nF
T
PIN 7 = V V
PIN5>VTH
CC
PIN 2 = GND Remaining pins open
C
=1µF,PIN5=0
T
=-40°C,T
LOW
-1mA*)10
= 85°C (AB series); T
HIGH
for MC34063A 2.5 4 mA
1.5 4for MC34063E
for MC34063A 2.1 V for MC34063E 1.5
LOW
= -40°C, T
= 125°C (EB series).
HIGH
Figure1 : Emitter Follower Configuration Output Saturation Voltage vs Emitter Current
Figure2 : Output SwitchON-OFF Time vs Oscillator Timing Capacitor
Figure3 : Common Emitter Configuration Output Switch Saturation Voltage vs Collector Current
Figure4 : Darlington Configuration Collector Emitter Saturation Voltage (V
CEsat)
vs Temperat.
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MC34063A/E
Figure5 : Power Collector E mi tter Saturation
Voltage (V
Figure6 : Current Limit Sense Voltage (V
vs Temperature
CEsat)
IPK
Temperature
)vs
Figure8 : Bias Current vs Temperat ure
Figure9 : Supply Current vs Temperature
Figure7 : Reference V oltage v s Temp eratu re
Figure10 : Supply Current vs Input Voltage
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