CYStech Electronics Corp.
Spec. No. : C501P8
Issued Date : 2003.03.21
Revised Date : . .
Page No. : 1/7
PL34063AP8 CYStek Product Specification
DC-to-DC Converter Control Circuit
PL34063AP8
Description
The PL34063AP8 is a monolithic control circuit containing the primary functions required for DC-to-DC
converters. This device consists of an internal temperature compensated reference, comparator, control- led
duty cycle oscillator with an active current limit circuit, driver and high current output switch.
Features
3V to 40V Input Voltage Operation
Internal 1.6A Peak Current Switch
Internal 1.8% Reference
Low Quiescent Current at 1.6mA
Frequency Operation from 100Hz~100KHz
Current Limiting
Applications
Saver for Cellular Phone
DC-DC Converter Module
Typical Application Circuit
L1
Fig1.Saver Circuit for Cellular Phone
1
8
2
3
4
5
6
7
V
in
V
out
C
out
220
F
D1
1N5819
C
T
470
F
RSC
C1
100
F
RA
5.6k
RB
33k
200
H
PL34063A
CYStech Electronics Corp.
Spec. No. : C501P8
Issued Date : 2003.03.21
Revised Date : . .
Page No. : 2/7
PL34063AP8 CYStek Product Specification
Pin Connections
Pin1:Switch Collector
Pin5:Comparator Inverting Input
Pin2:Switch Emitter
Pin6:Vcc
Pin3:Timing Capacitor
Pin7:Ipk Sense
1
2
3
4
5
6
7
8
Pin4:Gnd Pin8:Driver
Collector
Absolute Maxium Rating
Supply Voltage ...................................................................................................................................... 40 V
Comparator Input Voltage Range ............................................................................................. -0.3V ~ 40 V
Switch Collector Voltage ....................................................................................................................... 40 V
Switch Emitter Voltage .......................................................................................................................... 40 V
Switch Collector to Emitter Voltage ...................................................................................................... 40 V
Driver Collector Voltage ....................................................................................................................... 40 V
Switch Current ...................................................................................................................................... 1.6 A
Power Dissipation DIP Package Ta=25
C ........................................................................................... 1.0 W
Thermal Resistance Junction To Air ............................................................................................ 125
C / W
Operating Junction Temperature ......................................................................................................... 125
C
Operating Ambient Temperature Range......................................................................................... 0 ~ 70
C
Storage Temperature Range ................................................................................................. -40
C ~ 125
C
Electrical Characteristics
(Vcc=5V,Ta=25
C, unless otherwise specified)
Parameter Test
Condition
Symbol
Min.
Typ.
Max.
Unit
Oscillator
Charging Current
5.0V
V
CC
40V
I
chg
24
35
42
uA
Discharge Current
5.0V
V
CC
40V
I
dischg
140
220
260
uA
Voltage Amplitude
Pin3
V
OSC
-
0.6
-
V
Discharge to Charge Current Ratio
V
IPK(Sense)
=V
CC
I
Dischg
/I
chg
5.2 6.5 7.5
Current Limit Sense Voltage
I
Chg
=I
dischg
V
IPK(Sence)
250 300 350 mV
Output Switch
Saturation Voltage, Darlington
Connection
I
SW
=1.0A,
V
C(Driver)=
VC(Switch)
V
CE(Sat)
-
1.0
1.3
V
Saturation Voltage
I
SW
=1.0A, I
C(Driver)
=50mA
(Forced
20)
V
CE(Sat)
-
0.4
0.7
V
DC Current Gain
I
SW
=1.0A, V
CE
=5.0V hFE
50
75
-
V
Collector Off-State Current
V
CE
=30V I
CC(Off)
-
0.01
100
UA
Comparator
Threshold Voltage
Threshold Voltage
0
C
Ta
70
C
V
FB
1.227
1.210
1.250
-
1.273
1.29
V
Threshold Voltage Line Regulation
3.0V
V
CC
40V
Regline -
1.5
6
mV
Input Bias Current
V
IN
=0V I
IB
-
-20
-400
nA
Supply Current
V
IPK(Sence)
=V
CC
V
Pin5
>
V
FB
,
5.0V
V
CC
40V
C
T
=0.0001uF,Pin2=Gnd
Remaining pins open
I
CC
-
1.6
3
mA
CYStech Electronics Corp.
Spec. No. : C501P8
Issued Date : 2003.03.21
Revised Date : . .
Page No. : 3/7
PL34063AP8 CYStek Product Specification
Block Diagram
Application Information
Design Formula Table
Calculation Step-Down
Step-Up Voltage-Inverting
t
on
/ t
off
V
out
+V
F
/
V
in(min)
-V
sat
-V
Out
Vout+V
F
-V
in(min)
/
V
in(min)
-V
sat
|V
out
| + V
F /
V
in
-V
sat
(t
on
+ t
off
) max
1/F
min
1/F
min
1/F
min
C
T
4*10
-5
t
on
4*10
-5
t
on
4*10
-5
t
on
I
C(switch)
2*I
out(max)
2*I
out(max)
(t
on
+t
off
/t
off
)
2*I
out(max)
(t
on
+t
off
/t
off
)
RS
0.3 / I
C(switch)
0.3 / I
C(switch)
0.3 / I
C(switch)
L
(min)
(V
in(min)-
V
sat
-V
out
/
I
C(switch)
)
*t
on(max)
(V
in(min)-
V
sat
/
I
C(switch)
)
*t
on(max)
(V
in(min)-
V
sat
/
I
C(switch)
)
*t
on(max)
C
O
I
C(switch)
*(t
on
+t
off)
/
8V
Ripple(P-P)
I
out
*t
on
/ V
Ripple(P-P)
I
out
*t
on
/ V
Ripple(P-P)
V
sat
: Saturation voltage of the output switch.
V
F
: Forward voltage drop of the ringback rectifier.
The following power supply characteristics must be chosen :
V
in
: Nominal input voltage.
V
out
: Desired output voltage.
|V
out
|=1.25*(1+RB/RA)
I
out
- Desired output current
Fmin : Minimum desired output switching frequency at the selected values for V
in
and I
out
.
V
Ripple(P-P)
: Desired peak to peak output ripple voltage in practice, the calculated value will need to be increased due to the
capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly
effect the line and load regulation.
SC
Pin1:1.6A Switch Collector
TC
Pin3:Oscilletor Timing Capacitor
GND
Pin4:Power GND
DRI
Pin8:Driver Collector
IPK
Pin7:Highside Current Sense
Input, VCC-VIPK=300mV
VCC
Pin6:Power Supply Input
FB
Pin5:Feedback Comparator
Inverting Input
SE
Pin2:Darlington Switch Emitter
Q1
Q2
80
Q S
R
CT
IPK
Oscillator
Comparator
1.25V
Reference Voltage
+
-
CYStech Electronics Corp.
Spec. No. : C501P8
Issued Date : 2003.03.21
Revised Date : . .
Page No. : 4/7
PL34063AP8 CYStek Product Specification
Application Information
(Continued)
D1
200
H
1
8
2
3
4
5
6
7
PL34063A
RSC
C1
RA
R1
RB
C
T
D1
L1
Q1
R2
V
in
V
out
C
out
Fig.3 Step-Up Converter With External NPN Switch
1
8
2
3
4
5
6
7
1
8
2
3
4
5
6
7
V
out
28V / 200mA
R1
150
C
out
220
F
C
T
680
F
V
in
RA
2.2k
RSC
0 22
C1
100
F
PL34063A
L1
1N5819
RB
47k
Line Regulation : 100mV (V
in
=8V~16V, @I
o
=200mA)
Load Regulation : 5mV (Vin=12V, @Io=80mA~200mA)
Fig.2 Step-Up Converter
Fig.4 Step-Down Converter
Line Regulation : 40mV (V
in
=10V~20V, @I
o
=500mA)
Load Regulation : 5mV (Vin=15V, @Io=10mA~500mA)
Short Circuit Current : 1.3A (Vin=15V, @RL=0.1
)
PL34063A
V
out
5V / 500mA
RSC
0.25
L1
RB
RA
1.2k
3.6k
C
T
470
F
D1
1N5819
200
H
C
out
470
F
C1
100
F
V
in
CYStech Electronics Corp.
Spec. No. : C501P8
Issued Date : 2003.03.21
Revised Date :
Page No. : 5/7
PL34063AP8
CYStek Product Specification
Application Information
(Continued)
1
8
2
3
4
5
6
7
Fig.5 Step-Down Converter With External PNP Saturation Switch
V
out
V
in
PL34063A
R2
R1
Q1
L1
D1
RSC
C1
RA
RB
C
out
C
T
1
8
2
3
4
5
6
7
Fig.6 Voltage Inverting Converter
V
out
-12V / 100mA
C
out
470
F
L1
100
H
D1
1N5819
C
T
680
F
PL34063A
RSC
0.25
C1
100
F
RB
8.2k
RA
953
V
in
4.5V-6V
Line Regulation : 20mV (V
in
=4.5V~6V, @I
o
=100mA)
Load Regulation : 100mV (Vin=5V, @Io=10mA~100mA)
1
8
2
3
4
5
6
7
Fig.7 Voltage Inverting Converter With External PNP Saturation Switch
V
out
C
out
D1
L1
R1
R2
PL34063A
C
T
RSC
RA
RB
C1
V
in
Q1
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