NCP81045 datasheet(7/17 Pages) ONSEMI

Part #	NCP81045

Description	Single Synchronous Step-Down Controller

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NCP81045

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ELECTRICAL CHARACTERISTICS (VIN = 12 V, VCC = VCCP = 5 V, TA =−40°C to 85°C, unless other noted)

Characteristics

Unit

Max

Typ

Min

Test Conditions

Symbol

OSCILLATOR

Operation Frequency

FSW

270

300

330

kHz

OVERCURRENT THRESHOLD

Total Detection Time

TDETECT

Period of FB shorts to ground before

SS

1.26

1.92

2.21

ms

OCSET Detection Time

T_OCDET

(Note 2)

1.09

1.47

ms

INTERNAL SOFT−START

Soft−Start Time

TSS

0.9

1.1

1.3

ms

VOLTAGE ERROR AMPLIFIER

DC Gain

GAIN_VEA

(Note 2)

88

dB

Unity Gain Bandwidth

BW_VEA

(Note 2)

15

MHz

Slew Rate

SR_VEA

COMP PIN TO GND = 100 pF

(Note 2)

2.5

V/ms

FB Bias Current

Ibias_FB

0.1

mA

Output Voltage Swing

Vmax_EA

Isource_EA = 2 mA

3.3

3.5

V

Vmin_EA

Isink_EA = 2 mA

0.15

0.3

V

DIFFERENTIAL CURRENT SENSE AMPLIFIER

CS+ and CS− Common−mode Input

Signal Range

VCSCOM_MAX

Refer to AGND

3.5

V

Input Bias Current

CS_IIB

−100

100

nA

Input Signal Range

CS_range

−70

70

mV

Offset Current at IDRP

IDRP_offset

(CS+) − (CS−) = 0 V

−1.0

1.0

mA

[(CS+)−(CS−)] to IDRP Gain

IDRP_GAIN

(IDRP/((CS+)

− (CS−)))

(CS+) − (CS−) = 10 mV, V(IDRP) =

0.8 V

0.475

0.525

0.575

mA/mV

0.425

0.625

mA/mV

Current−Sense Bandwidth

BW_CS

At

−3dB to DC Gain (Note 2)

20

MHz

Maximum IDRP Output Voltage

IDRP_Max

(CS+) − (CS−) = 70 mV, Isource drops

to 95% of the value when V(IDRP) =

0.8 V

2.5

V

Minimum IDRP Output Voltage

IDRP_Min

0

V

IDRP Output current

I_IDRP

−1.0

35

mA

OVERCURRENT PROTECTION SETTING

Overcurrent Threshold (OCTH)

Detection Current

I_OCSET

Sourced from OCP before soft−start,

Rocset = 16.7 kW is connected from

OCP to AGND or FB

21.6

24

26.4

mA

Ratio of OC Threshold over OCSET

Votlage

K_OCSET

V((CS+) − (CS−)) / V_OCSET

(Note 2)

0.1

−

OCSET Voltage for Default Fixed OC

Threshold

VOCSET_DFT

Rocset v 2 kW is connected from

OCP to AGND or FB

100

mV

OCSET Voltage for Adjustable OC

Threshold

VOCSET_ADJ

Rocset = 8.3 ~ 25 kW is connected

from OCP to AGND or FB

200

600

mV

OCSET Voltage for OC Disable

VOCSET_DIS

Rocset w 35 kW is connected from

OCP to AGND or FB

720

mV

Default Fixed OC Threshold

V_OCTH_DFT

(CS+) – (CS−), Pin OCP is shorted to

AGND or FB

35

40

45

mV

2. Guaranteed by design, not tested in production.

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