NCP1575DG datasheet(5/16 Pages) ONSEMI

Part #	NCP1575DG

Description	Low Voltage Synchronous Buck Controller with Adjustable Switching Frequency

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1575

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ELECTRICAL CHARACTERISTICS (0

°C < TJ < 125°C, 9.0 V < VCC < 20 V, CGATE(H) = CGATE(L) = 3.3 nF,

CCOMP = 0.1 mF, ROSC = 74 kW; unless otherwise specified.) Note 3

Characteristic

Test Conditions

Min

Typ

Max

Unit

GATE(H) and GATE(L)

Rise Time

1.0 V < GATE(L), GATE(H) < VCC − 2.0 V,

VCC = 12 V

−

40

80

ns

Fall Time

VCC − 2.0 V < GATE(L), GATE(H) < 1.0 V,

VCC = 12 V

−

40

80

ns

GATE(H) to GATE(L) Delay

GATE(H) < 2.0 V, GATE(L) > 2.0 V

40

60

105

ns

GATE(L) to GATE(H) Delay

GATE(L) < 2.0 V, GATE(H) > 2.0 V

40

60

105

ns

Minimum Pulse Width

GATE(X) = 4.0 V

−

250

−

ns

High Voltage (AC)

Measure GATE(L) or GATE(H)

0.5 nF < CGATE(H) = CGATE(L) < 10 nF, Note 4

VCC −

0.5

VCC

−

V

Low Voltage (AC)

Measure GATE(L) or GATE(H)

0.5 nF < CGATE(H) = CGATE(L) < 10 nF, Note 4

−

0

0.5

V

GATE(H)/(L) Pull−Down

Resistance to GND. Note 4

20

50

115

k

W

PWM Comparator

PWM Comparator Offset

VFB = 0 V, Increase COMP Until GATE(H)

Starts Switching

0.415

0.465

0.525

V

Ramp Max Duty Cycle

−

80

−

%

Artificial Ramp

Duty Cycle = 50%, ROSC = 74 kW

50

63

75

mV

Transient Response

COMP = 1.5 V, VFB 20 mV Overdrive. Note 4

−

200

300

ns

VFB Input Range

Note 4

0

−

1.4

V

Oscillator

Switching Frequency

ROSC Not Used

ROSC = 74 kW

170

240

200

280

230

320

kHz

General Electrical Specifications

VCC Supply Current

COMP = 0 V (No Switching)

−

9.0

12

mA

Start Threshold

GATE(H) Switching, COMP Charging

8.0

8.5

9.0

V

Stop Threshold

GATE(H) Not Switching, COMP Discharging

7.0

7.5

8.0

V

Hysteresis

Start − Stop

0.75

1.0

1.25

V

3. Characteristics at temperature extremes are guaranteed via correlation using quality statistical control methods.

4. Guaranteed by design. Not tested in production.

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