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CS5171 Folha de dados(PDF) 4 Page - ON Semiconductor

Nome de Peças CS5171
Descrição Electrónicos  1.5 A 280 kHz/560 kHz Boost Regulators
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Fabricante Electrônico  ONSEMI [ON Semiconductor]
Página de início  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS5171 Folha de dados(HTML) 4 Page - ON Semiconductor

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ELECTRICAL CHARACTERISTICS (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
Unit
Max
Typ
Min
Test Conditions
Power Switch
Switch Saturation Voltage
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
0.8
0.55
0.75
0.09
1.4
0.45
V
V
V
V
Switch Current Limit
50% duty cycle, (Note 3)
80% duty cycle, (Note 3)
1.6
1.5
1.9
1.7
2.4
2.2
A
A
Minimum Pulse Width
FB = 0 V or NFB = 0 V, ISW = 4.0 A, (Note 3)
200
250
300
ns
DICC/ DIVSW
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)
10
17
30
100
30
100
mA/A
mA/A
mA/A
mA/A
Switch Leakage
VSW = 40 V, VCC = 0V
2.0
100
mA
General
Operating Current
ISW = 0
5.5
8.0
mA
Shutdown Mode Current
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
12
60
100
mA
Minimum Operation Input Voltage
VSW switching, maximum ISW = 10 mA
2.45
2.70
V
Thermal Shutdown
(Note 3)
150
180
210
°C
Thermal Hysteresis
(Note 3)
25
°C
3. Guaranteed by design, not 100% tested in production.
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
(CS5172/4)
3
CS5171/3)
Test
These pins are connected to internal test logic and should either be left floating or tied to ground. Connection
to a voltage between 2 V and 6 V shuts down the internal oscillator and leaves the power switch running.
3
(CS5172/4)
NFB
Negative feedback pin. This pin senses a negative output voltage and is referenced to −2.5 V. When the
voltage 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
connected 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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