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Semiconductor
http:// www.auk.co.kr
SOP-8
SN7101/P
Voltage and Current Controller
Description
The SN7101 is integrated a high stability band gap voltage reference,
two ORed operational amplifiers and a current source.
This IC compares the DC voltage and the current level at the output of
a switching power supply to an internal reference. It provides a feedback
through an Opto-coupler to the PWM controller IC in the primary side.
The controlled current generator can be used to modify the level of current
limitation by offsetting the information coming from the current sensing
resistor.
DIP-8
Features and Benefits
1.24V Series Voltage Reference with 10mA Output Current and
2.5% Precision
Two Operational Amplifiers with ORed Output And 1MHz Gain
Bandwidth
Built-in Current Generator with Enable/Disable Fucntion
Wide Range of Supply Voltage [ 4.5V to 32V ]
ORDERING INFORMATION
Product
SN7101
SN7101P
Marking
SN7101
SN7101
Package
SOP-8
DIP-8
Marking Detail Information
Application
Battery chargers
AC to DC Power Supply
Block Diagram
SN7101()
YYWW()
Device Code
Week Code
Dec, 2011 REV. 00
KSD-I7F019-000
1

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Pin connection
SN7101/P
8
7
6
5
1
2
3
4
8
7
6
5
1
2
3
4
Pin Configuration
No. Name
Function
1 Vref Voltage Reference Output 1.24V ( Max. 10mA )
Current Source Enable Input. This current source can be used to offset the
2
Csen
voltage measurement on the sense resistor and therefore to modify the
charge current. The current source enabled when the input voltage on pin 2
is lower than 0.8V
3
Crref
Current Limitation Reference Input
4
GND
Ground
5 Crin Current Limitation Loop Input, connected to the sense resistor
6
Output
Output pin common to the voltage regulation and current limitation loops.
This output can drive the primary side of an opto-coupler
7 Vrin Voltage Regulation Loop Input
8 VCC Supply Voltage Input ( 4.5V to 32V DC)
Dec, 2011 REV. 00
KSD-I7F019-000
2

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SN7101/P
Absolute Maximum Ratings ( Ta = 25)
Parameter
DC Supply Voltage
Symbol
VCC
Limits
SOP-8
DIP-8
36
Output Current
IOUT
20
Input Voltage
VIN -0.3 to Vcc-1.5
Power Dissipation
Maximum Junction Temperature
PD 600 1000
Tj 150
Operating Junction Temperature Range
Topr
-40 ~ +105
Thermal Resistance
Rthja 200 130
Storage Temperature Range
Tstg -55 ~ +150
1) The voltage reference is not protected against permanent short circuit.
2) The magnitude of input and output voltages must never exceed -0.3V or Vcc-1.5V.
Operating Condition
Parameter
Supply Voltage
Symbol
VCC
Limits
4.5 to 32
Unit
V
mA
V
mW
/ W
Unit
V
Electrical characteristics
[ Operational Amplifier ]
( VCC=15V, TA=25; unless otherwise specified )
Characteristic
Symbol
Test Condition
Total Supply Current
Input Voltage Range
Input Offset Voltage
Input Bias Current
Output Sink Current
Large Signal Voltage Gain
Supply Voltage Rejection Ratio
Common Mode Rejection Ratio
Gain Bandwidth Product
Output Leakage Current
ICC
VIN
VIO
IIB
ISINK
AVO
SVR
CMR
GBP
IO
VCC=1.5V
-
Ta = 25
Tmin. < Ta < Tmax
Vin=1.2V/Vin=0V, Ta = 25
Tmin. < Ta < Tmax
VOL=2.5V, Ta = 25
Tmin. < Ta < Tmax
RL=2KΩ, Tmin. < Ta < Tmax
Tmin. < Ta < Tmax
Tmin. < Ta < Tmax
Vcc=30V, Vin=10mV
RL=2k, CL=100pF, f=100kHz,
Ta = 25
Tmin. < Ta < Tmax
Min.
-
0
-5
-7
-700
-1000
-
8
15
65
-
0.5
-
-
Typ.
-
-
1
-
-300
-
15
-
-
90
80
0.9
-
-
Max. Unit
2.0
Vcc-1.5
5
7
0
0
-
-
-
-
-
mA
V
mV
nA
mA
V/mV
dB
dB
- MHz
2
uA
7
Dec, 2011 REV. 00
KSD-I7F019-000
3

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SN7101/P
Electrical characteristics
[ Voltage Reference]
( VCC=15V, TA=25; unless otherwise specified )
Characteristic Symbol
Test Condition
Reference Voltage
Vref Iout=1mA, Ta = 25
Temperature Stability
Kvt Tmin. < Ta < Tmax
Load Regulation
Reglo 1mA < Iout < 10mA
Line Regulation
Regli 5V < Vin < 32V
Min. Typ. Max. Unit
1.210 1.240 1.270
V
- 35 120 ppm/
- 5 15 mV
- 3.5 10 mV
[ Current Generator ]
( VCC=15V, TA=25; unless otherwise specified )
Characteristic
Symbol Test Condition
Min. Typ. Max. Unit
Current Source
Temperature Stability
Line Regulation
Current Generator Enable Voltage
Current Generator Disable Voltage
Current Generator Input Current
@ On the Csen Pin
Leakage Current
IO Ta = 25
Kcgt Tmin. < Ta < Tmax
Cglir 4.5V < Vcc < 32V
Vcsen
Vcsdis
Icsen
Icsleak
Io=1.4mA,
Tmin. < Ta < Tmax
Io=0mA,
Tmin. < Ta < Tmax
Tmin. < Ta < Tmax
Vcs=2V,
Tmin. < Ta < Tmax
- 1.4 - mA
- 600 - ppm/
-
0.003
0.03
mA
- - 0.6 V
2 - -V
- - 30 uA
- 0.5 2.0 uA
Dec, 2011 REV. 00
KSD-I7F019-000
4

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SN7101/P
Typical application circuit
Secondary Block
D2
C1
D1
C2
Photo
D io de
R2 R1
C3
1
V re f
2 Csen
3 C rref
4 GND
Vcc 8
R9
V rin 7
O utput
C rin
C4
6
C5
5
R3
R4
R5
R7
R8
C6
R6
COMPONENTS CALCULATIONS
The voltage control is given by the choice of the resistor bridge R6/R7 (and the trimmer R8)
Vref = R6/(R6+R7)xVout
where Vref = 1.24V
The current control is given by the choice of the voltage drop through the sense resistor R5 (to be linked to the
nominal current of the application) and by the value of the sense resistor itself.
For medium currents (< 1A), a good value for the voltage drop through R5 can be Vsense = 200mV
(dissipation < 200mW). The resistor bridge R2/R3 should be chosen following
Vsense = R3/(R2+R3)xVref
The total value of the resistor bridge should be in the range of the kin order to ensure a proper charge for the
voltage reference(in the range of themA).
To set the current limit, the senseresistorR5should be chosen following
Ilim = Vsense/R5
The internal current generator (Isce) can be used to offset the current limitation with a lower value.
This current generator is activated by connecting pin 2 to ground. It is inhibited if pin 2 is connected
to the positive rail via the pull up resistor R1. The current offset is given by the choice of the
resistor R4. If Ilim1 is the current limit calculated in the previous paragraph, and Ilim2 is the current limit that is to
be set when pin 2 is connected to ground, R4 should be chosen following
R4 = (Vsense - Ilim2xR5)/Isce
Dec, 2011 REV. 00
KSD-I7F019-000
5