NCP81243_17 datasheet(12/26 Pages) ONSEMI

Part #	NCP81243

Description	Dual Output 3 & 2 Phase Controller

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NCP81243

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Table 4. NCP81243 (3+2) ELECTRICAL CHARACTERISTICS

Unless otherwise stated: −40

°C < TA < 100°C; 4.75 V < VCC < 5.25 V; CVCC = 0.1 mF

Parameter

Unit

Max

Typ

Min

Test Conditions

OUTPUT OVER VOLTAGE & UNDER VOLTAGE PROTECTION (OVP & UVP)

Over Voltage Threshold Above DAC

VSS rising

375

400

425

mV

Over Voltage Delay

VSS rising to PWMx low

50

ns

Under Voltage Threshold Below

DAC−DROOP

VSS falling

275

300

325

mV

Under−voltage Hysteresis

VSS rising

25

mV

Under−Voltage Delay

5

mS

OVERCURRENT PROTECTION

ILIM Threshold Current

(OCP shutdown after 50 us delay)

Main Rail, Rlim = 20 k

W

8.0

10

12

mA

ILIM Threshold Current

(immediate OCP shutdown)

Main Rail, Rlim = 20 k

13

15

16.5

mA

ILIM Threshold Current

(OCP shutdown after 50

ms delay)

Main Rail, RLIM = 20 K

(N = number of phases in PS0 mode)

10/N

mA

ILIM Threshold Current

(immediate OCP shutdown)

Main Rail, RLIM = 20 K

(N= number of phases in PS0 mode)

15/N

mA

ILIM Threshold Current

(OCP shutdown after 50

ms delay)

Auxiliary Rail, Rlim = 20 k

8.0

10

11

mA

ILIM Threshold Current

(immediate OCP shutdown)

Auxiliary Rail, Rlim = 20 k

13

15

16.5

mA

ILIM Threshold Current

(OCP shutdown after 50

ms delay)

Auxiliary Rail RLIM = 20 K

10/N

mA

ILIM Threshold Current

(immediate OCP shutdown)

Auxiliary Rail, RLIM = 20 K

15/N

mA

MODULATORS (PWM COMPARATORS) FOR MAIN RAIL & AUXILIARY RAIL

Minimum Pulse Width

Fsw = 350 KHz

60

ns

0% Duty Cycle

COMP voltage when the PWM outputs

remain LO

1.3

−

V

100% Duty Cycle

COMP voltage when the PWM outputs

remain HI VRMP = 12.0 V

−

2.5

−

V

PWM Ramp Duty Cycle Matching

COMP = 2 V, PWM Ton matching

1

%

PWM Phase Angle Error

Between adjacent phases

±5

deg

Ramp Feed−forward Voltage range

4.5

20

V

TSENSE/TSENSEA

VRHOT Assert Threshold

440

mV

VRHOT Rising Threshold

460

mV

Alert Rising Threshold

480

mV

Alert Assertion Threshold

460

mV

TSENSE Bias Current

−57.5

−60

−62.5

mA

VRHOT

Output Low Voltage

0.3

V

Output Leakage Current

High Impedance State

−1.0

−

1.0

mA

ADC

Voltage Range

0

2

V

Total Unadjusted Error (TUE)

−1.25

+1.25

%

Differential Nonlinearity (DNL)

8−bit

1

LSB

Power Supply Sensitivity

±1

%

Conversion Time

30

ms

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