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CS5174EDR8 Fiches technique(PDF) 4 Page - ON Semiconductor |
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CS5174EDR8 Fiches technique(HTML) 4 Page - ON Semiconductor |
4 / 22 page CS5171, CS5172, CS5173, CS5174 http://onsemi.com 4 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 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 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. |
Numéro de pièce similaire - CS5174EDR8 |
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Description similaire - CS5174EDR8 |
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