SP433
Constant Voltage and Constant Current Controller
DESCRIPTION
The SP433 is high-voltage four-terminal adjustable
voltage references, with over current protection
feature. The SP433 is a one chip solution to a 2.5V
precision voltage reference and constant current output
in the application of secondary feedback control of
power supply, DC/DC converter, adaptor and charger.
SP433 is idea for low cost switching power supply
application.
APPLICATIONS
Battery Charger
Battery Power Equipment
Linear Regulators
Switch Power Supply
Cellular Phone
Digital Cameras
Computer Disk Drivers
Instrumentation
FEATURES
Voltage Reference Accuracy of 0.5% & 1.0%
Sink Current Capability from 1mA to 100mA
Adjustable Output Voltage from VREF to 18V
Low Output Noise
Typical Output Dynamic Impedance Less Than
200mΩ
Available in SOT-23-5L and TO-94 package
Over Current Protection
PIN CONFIGURATION
TO-94
SOT-23-5L
PART MARKING
TO-94
SOT-23-5L
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Ver.1
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SP433
Constant Voltage and Constant Current Controller
TYPICAL APPLCATION CIRCUIT
PIN DESCRIPTION ( TO-94 )
Pin
1
2
3
4
PIN DESCRIPTION ( SOT-23-5L )
Pin
1
2
3
4
5
Symbol
P
NC
ANODE
REF
CATHODE
Description
CURRENT ENABLE
NC
ANODE
REF
CATHODE
Symbol
R
A
C
P
Description
REF
ANODE
CATHODE
CURRENT ENABLE
ORDERING INFORMATION
Part Number
Voltage Tolerance
Package
SP433AS25RGB
0.5%
SOT-23-5L
SP433BS25RGB
1.0%
SOT-23-5L
SP433AT94AGB
0.5%
TO-94
SP433BT94AGB
1.0%
TO-94
※
Week Code : A ~ Z ( 1 ~ 26 ) ; a ~ z ( 27 ~ 52 )
※
SP433AS25RGB : Tape Reel ; Pb – Free ; Halogen -Free
※
SP433BS25RGB : Tape Reel ; Pb – Free ; Halogen -Free
※
SP433AT94AGB : Tape Ammo ; Pb-Free ; Halogen -Free
※
SP433BT94AGB : Tape Ammo ; Pb-Free ; Halogen -Free
Part Marking
33AYW
33BYW
SP433
SP433
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Ver.1
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SP433
Constant Voltage and Constant Current Controller
BLOCK DIAGRAM
ABSOULTE MAXIMUM RATINGS
(T
A
=25
℃
Unless otherwise specified)
Parameter
Cathode Voltage
Continuous Cathode Current Range
Reference Current Range
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature Range (Soldering 10Sec)
Thermal Resistance
Symbol
V
Z
I
Z
I
REF
T
J
T
STG
T
SOL
Ө
JA
Value
18
150
10
-40 ~ +150
-65 ~ +150
260
140
Unit
V
mA
mA
℃
℃
℃
℃/W
The IC has a protection circuit against static electricity. Do not apply high static electricity or high voltage that
exceeds the performance of the protection circuit to the IC.
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SP433
Constant Voltage and Constant Current Controller
ELECTRICAL CHARACTERISTICS
(T
A
=25℃ , Unless otherwise specified)
Parameter
Reference Input Voltage
(I
K
=10mA,V
Z
=V
REF
)
V
REF
Temp Deviation
Ratio Of Change In REF To Change
In Cathode Voltage
Reference Input Current
IREF Temp Deviation
Off-State Cathode Current
Dynamic Output Impedance
Minimum Operating Current
Current Amplification
Saturation Voltage
Maximum Protection Current
Symbol
V
REF
V
DEV
△
V
REF
/
△
V
Z
I
REF
I
REF(DEV)
I
Z(OFF)
R
Z
I
z(MIN)
Iamp
Vsat
I
P
Conditions
SP433A
SP433B
T
A
=-40℃~+80℃
V
Z
=V
REF
I
Z
=10mA
I
Z
=10mA,
△
V
Z
= 18V~V
REF
I
Z
=10mA
R1=10KΩ
R2=∞
T
A
=-40℃~+80℃
R1=10KΩ , R2=∞
I
Z
=10mA
V
REF
=0V , V
Z
=18V
f<1kHz , V
Z
=V
REF
I
Z
=1mA~100mA
V
Z
=V
REF
V
C
=1V, I
A
=50uA
Ic=150mA, I
A
=10mA
10
0.8
100
1.0
Min
2.487
2.475
Typ
2.5
2.5
10
-1.4
Max
2.513
2.525
25
-2.7
1
2.5
0.1
1.5
1.0
Units
V
mV
mV/V
uA
uA
uA
Ω
mA
mA
V
mA
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SP433
Constant Voltage and Constant Current Controller
APPLICATION NOTE
In the above application, SP433 is used to provide an accurate control of voltage and current. The voltage loop is
controlled through an internal error amplifier, the resistor bridge R
1
, R
2
and the photo-coupler. The relation
between V
out
, R
1
, R
2
and V
ref
is shown in:
V
out
= V
ref x
(1+R
1
/R
2
)
The current loop is controlled through an internal transistor, the sense resistor and the photo-coupler. The control
equation is:
R
isense
X I
-limit
= 0.7V (typical)
Where I
-limit
is the desired current limit. The selection of R
isense
should consider the power loss through R
isense
. It
is calculated as:
P
-limit
= 0.7
X
I
-limit
Whether AC input is at High Line or Low Line, SP433 can provide the same current protection. It has the fuse
function at the output.
2009/03/16
Ver.1
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