NCP4331 datasheet(6/23 Pages) ONSEMI | Synchronous Buck Controller for High Efficiency Post Regulation

6 page

NCP4331

http://onsemi.com

ELECTRICAL CHARACTERISTICS (VCC = 20 V, VBST = 7 V, HB Grounded, TJ = 0°C to +125°C, unless otherwise specified)

Symbol

Unit

Max

Typ

Min

Rating

ERROR AMPLIFIER

Vref

Referenced Voltage Regulation @ Pin 7 Being Open

°C < TJ < 85°C

-40

°C < TJ < 125°C (Guaranteed by Test from 0°C < TJ < 125°C and

Extended to -40

°C by Design)

0.738

0.735

0.750

0.762

0.765

IBFB

Feedback Input Bias Current @ Vpin6 = Vref

-500

-250

Gain Bandwidth

MHz

GEA

Open Loop Voltage Gain

EAout

-EAmax

-EAmin

Pin 5 (Compensation) Voltage

Vpin6 = 0 V

Vpin6 = 1 V

3.50

3.70

0.05

0.50

Isource-EA

Output Source Current @ Vpin6 = 0 V

SOFT-START AND MAXIMUM DUTY-CYCLE LIMITATION (Dmax)

ISS

Source Current @ VSS = 0 V to 3.5 V

VSS

Clamp Voltage

3.5

3.7

EAMIN

Error Amplifier Output @ Vpin5 = 0.5 V

0.05

0.5

EASS

Error Amplifier Output @ Vpin6 = 0 V and Vpin7 = 2 V

1.9

2.0

2.1

RAMP CONTROL

Iramp

Cramp Current Source @ Vramp = 0 V to 3.5 V

VrampH

Cramp Ramp Clamp

3.5

3.7

VrampL

Low Voltage of the Ramp Saw-Tooth

100

VrampON

Ramp Voltage Enabling the High-Side Driver:

@Vpin5 = 0.5 V

@ Vpin5 = 3.5 V (Min Highest EA Value)

@ Vpin5 = 2 V

2.30

0.80

2.50

1.00

2.65

1.20

QRESET

Current Charge Extracted During the RESET Pulse (Note 4)

TRESET

Delay from SYNC Pin low to Reset Completion (a Falling Pulse Being

Applied to Pin 16)

200

350

RRESET

Sink Resistance of Pin 8 during the Reset Time @ Ipin8 = 10 mA (This is

the Resistance of the Switch that Discharges the Cramp Capacitor during

the Reset Pulse - Capability of 5 nC Min)

SYNCHRONIZATION BLOCK

VSYNCH

Synchronization Comparator Threshold (Vpin9 Rising)

2.4

2.5

2.6

HSYNC

Synchronization Comparator Hysteresis

1.2

1.5

1.8

VCL-SYNC

Negative Clamp Voltage of the Synchronization Pin @ Ipin16 = 2 mA

-0.3

TSYNCwHS

Delay From SYNC Pin High to HS_DRV High

(A Rising PUlse Being Applied to Pin 16)

100

250

UNDERVOLTAGE DETECTION (UVP)/SHUTDOWN

VUVPL

Comparator Threshold (Vpin4 Being Falling)

1.92

2.00

2.08

VUVPH

Comparator Threshold (Vpin4 Being Rising) (Note 5)

2.20

HUVP

Hysteresis of the UVP Comparator

IUVP

UVP Current Source

IBUVP

Bias Current

0.1

3. The risetime is the time needed by the drive to go from 10% to 90% of the supply voltage. The fall time is the time required by the drive

to drop from 90% to 10% of its supply voltage. These times are not tested in production but only guaranteed by design.

4. Guaranteed by design. Tested through the RRESET parameter.

5. Guaranteed by characterization and design.

6. This delay is specified with the HB pin being grounded. In typical application where the HB node is pulsing, the delay is 70 ns typically

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