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CS5174 데이터시트 PDF




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부품번호 CS5174 기능
기능 1.5 A 280 kHz/560 kHz Boost Regulators
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CS5174 데이터시트, 핀배열, 회로
CS5171, CS5172, CS5173,
CS5174
1.5 A 280 kHz/560 kHz
Boost Regulators
The CS5171/2/3/4 products are 280 kHz/560 kHz switching
regulators with a high efficiency, 1.5 A integrated switch. These parts
operate over a wide input voltage range, from 2.7 V to 30 V. The
flexibility of the design allows the chips to operate in most power
supply configurations, including boost, flyback, forward, inverting,
and SEPIC. The ICs utilize current mode architecture, which allows
excellent load and line regulation, as well as a practical means for
limiting current. Combining high frequency operation with a highly
integrated regulator circuit results in an extremely compact power
supply solution. The circuit design includes provisions for features
such as frequency synchronization, shutdown, and feedback controls
for either positive or negative voltage regulation. These parts are
pin−to−pin compatible with LT1372/1373.
Part Number
CS5171
CS5172
CS5173
CS5174
Frequency
280 kHz
280 kHz
560 kHz
560 kHz
Feedback Voltage Polarity
positive
negative
positive
negative
Features
Pb−Free Packages are Available
Integrated Power Switch: 1.5 A Guaranteed
Wide Input Range: 2.7 V to 30 V
High Frequency Allows for Small Components
Minimum External Components
Easy External Synchronization
Built in Overcurrent Protection
Frequency Foldback Reduces Component Stress During an
Overcurrent Condition
Thermal Shutdown with Hysteresis
Regulates Either Positive or Negative Output Voltages
Shut Down Current: 50 mA Maximum
Pin−to−Pin Compatible with LT1372/1373
Wide Temperature Range
Industrial Grade: −40°C to 125°C
Commercial Grade: 0°C to 125°C
http://onsemi.com
SOIC−8
D SUFFIX
CASE 751
PIN CONNECTIONS AND
MARKING DIAGRAM
1 CS5171/3 8
VC VSW
FB PGND
Test AGND
SS VCC
CS5172/4
18
VC VSW
Test PGND
NFB
AGND
SS VCC
x = 1, 2, 3, or 4
x = E, G
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
ORDERING INFORMATION
See detailed ordering and shipping information in the
package dimensions section on page 17 of this data sheet.
© Semiconductor Components Industries, LLC, 2004
June, 2004 − Rev. 20
1
Publication Order Number:
CS5171/D




CS5174 pdf, 반도체, 판매, 대치품
CS5171, CS5172, CS5173, CS5174
ELECTRICAL CHARACTERISTICS (continued) (2.7 V< VCC < 30 V; Industrial Grade: −40°C < TJ < 125°C;
Commercial Grade: 0°C < TJ < 125°C; For all CS5171/2/3/4 specifications unless otherwise stated.)
Characteristic
Test Conditions
Min Typ
Power Switch
Switch Saturation Voltage
Switch Current Limit
Minimum Pulse Width
DICC/ DIVSW
Switch Leakage
General
ISWITCH = 1.5 A, (Note 3)
ISWITCH = 1.0 A, 0°C TJ 85°C
ISWITCH = 1.0 A, −40°C TJ 0°C
ISWITCH = 10 mA
50% duty cycle, Note 3
80% duty cycle, Note 3
FB = 0 V or NFB = 0 V, ISW = 4.0 A, (Note 3)
2.7 V VCC 12 V, 10 mA ISW 1.0 A
12 V < VCC 30 V, 10 mA ISW 1.0 A
2.7 V VCC 12 V, 10 mA ISW 1.5 A, (Note 3)
12 V < VCC 30 V, 10 mA ISW 1.5 A, (Note 3)
VSW = 40 V, VCC = 0V
1.6
1.5
200
0.8
0.55
0.75
0.09
1.9
1.7
250
10
17
2.0
Operating Current
Shutdown Mode Current
Minimum Operation Input Voltage
Thermal Shutdown
Thermal Hysteresis
ISW = 0
VC < 0.8 V, SS = 0 V, 2.7 V VCC 12 V
VC < 0.8 V, SS = 0 V, 12 V VCC 30 V
VSW switching, maximum ISW = 10 mA
(Note 3)
(Note 3)
− 5.5
− 12
−−
− 2.45
150 180
− 25
3. Guaranteed by design, not 100% tested in production.
Max Unit
1.4 V
−V
−V
0.45 V
2.4 A
2.2 A
300 ns
30 mA/A
100 mA/A
30 mA/A
100 mA/A
100 mA
8.0 mA
60 mA
100
2.70 V
210 °C
°C
PACKAGE PIN DESCRIPTION
Package
Pin #
Pin
Symbol
Function
1 VC Loop compensation pin. The VC pin is the output of the error amplifier and is used for loop compensation,
current limit and soft start. Loop compensation can be implemented by a simple RC network as shown in the
application diagram on page 2 as R1 and C1.
2
(CS5171/3
only)
FB Positive regulator feedback pin. This pin senses a positive output voltage and is referenced to 1.276 V. When
the voltage at this pin falls below 0.4 V, chip switching frequency reduces to 20% of the nominal frequency.
2 Test These pins are connected to internal test logic and should either be left floating or tied to ground. Connection
(CS5172/4)
to a voltage between 2 V and 6 V shuts down the internal oscillator and leaves the power switch running.
3
(CS5171/3)
3
(CS5172/4)
NFB
Negative feedback pin. This pin senses a negative output voltage and is referenced to −2.5 V. When the volt-
age at this pin goes above −0.65 V, chip switching frequency reduces to 20% of the nominal frequency.
4 SS Synchronization and shutdown pin. This pin may be used to synchronize the part to nearly twice the base
frequency. A TTL low will shut the part down and put it into low current mode. If synchronization is not used,
this pin should be either tied high or left floating for normal operation.
5 VCC Input power supply pin. This pin supplies power to the part and should have a bypass capacitor connected to
AGND.
6 AGND Analog ground. This pin provides a clean ground for the controller circuitry and should not be in the path of
large currents. The output voltage sensing resistors should be connected to this ground pin. This pin is con-
nected to the IC substrate.
7 PGND Power ground. This pin is the ground connection for the emitter of the power switching transistor. Connection
to a good ground plane is essential.
8 VSW High current switch pin. This pin connects internally to the collector of the power switch. The open voltage
across the power switch can be as high as 40 V. To minimize radiation, use a trace as short as practical.
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CS5174 전자부품, 판매, 대치품
CS5171, CS5172, CS5173, CS5174
TYPICAL PERFORMANCE CHARACTERISTICS
100 VCC = (12 V)
75
−40°C
50
25°C
25
85°C
0
350 380 400
VFB (mV)
420 450
Figure 9. Switching Frequency vs. VFB
(CS5171/3 only)
VCC = (12 V)
100
75
85°C
50
−40°C
25
25°C
0
−550
−660
VNFB (mV)
−725
Figure 10. Switching Frequency vs. VNFB
(CS5172/4 only)
1.280
1.278
VCC = 12 V
1.276
1.274
1.272
1.270
VCC = 2.7 V
VCC = 30 V
1.268
0 50
Temperature (°C)
100
Figure 11. Reference Voltage vs. Temperature
(CS5171/3 only)
−2.42
−2.43
VCC = 30 V
−2.44
−2.45
−2.46
VCC = 12 V
−2.47
−2.48
0
50
Temperature (°C)
VCC = 2.7 V
100
Figure 12. Reference Voltage vs. Temperature
(CS5172/4 only)
0.20
0.18
0.16
0.14
0.12
VCC = 12 V
0.10
VCC = 2.7 V
0.08 0 50 100
Temperature (°C)
Figure 13. IFB vs. Temperature (CS5171/3 only)
−7
−8
−9
−10
−11
−12
−13
−14
0
50
Temperature (°C)
100
Figure 14. INFB vs. Temperature (CS5172/ 4 only)
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