NCP1031 datasheet(6/18 Pages) ONSEMI

Part #	NCP1031

Description	Low Power PWM Controller with On-Chip Power Switch and Startup Circuits for 48 V Telecom Systems

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NCP1030, NCP1031

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DC ELECTRICAL CHARACTERISTICS (VDRAIN =48 V, VCC =12 V, CT = 560 pF, VUV =3 V, VOV =2 V, VFB =2.3 V,

VCOMP =2.5 V, TJ =--40C to 125C, typical values shown are for TJ =25C unless otherwise noted.) (Note 2)

Characteristics

Symbol

Min

Typ

Max

Unit

OSCILLATOR

Frequency (CT = 560 pF, Note 3)

TJ =25C

TJ =--40C to 125C

fOSC1

275

260

300

--

325

kHz

Frequency (CT = 100 pF)

fOSC2

--

800

--

kHz

Charge Current (VCT =3.25 V)

ICT(C)

--

215

--

mA

Discharge Current (VCT =3.25 V)

ICT(D)

--

645

--

mA

Oscillator Ramp

Peak

Valley

Vrpk

Vrvly

--

3.5

3.0

--

V

PWM COMPARATOR

Maximum Duty Cycle

DCMAX

70

75

80

%

POWER SWITCH CIRCUIT

Power Switch Circuit On--State Resistance (ID = 100 mA)

NCP1030

TJ =25C

TJ = 125C

NCP1031

TJ =25C

TJ = 125C

RDS(on)

--

4.1

6.0

2.1

3.5

7.0

12

3.0

6.0

Ω

Power Switch Circuit and Startup Circuit Breakdown Voltage

(ID = 100 mA, TJ =25C)

V(BR)DS

200

--

V

Power Switch Circuit and Startup Circuit Off--State Leakage Current

(VDRAIN = 200 V, VUV =2.0 V)

TJ =25C

TJ = --40to125C

IDS(off)

--

13

--

25

50

mA

Switching Characteristics (VDS =48 V, RL = 100 Ω)

Rise Time

Fall Time

tr

tf

--

22

24

--

ns

CURRENT LIMIT AND OVER TEMPERATURE PROTECTION

Current Limit Threshold (TJ =25C)

NCP1030 (di/dt = 0.5 A/ms)

NCP1031 (di/dt = 1.0 A/ms)

ILIM

350

700

515

1050

680

1360

mA

Propagation Delay, Current Limit Threshold to Power Switch Circuit Output

(Leading Edge Blanking plus Current Limit Delay)

tPLH

--

100

--

ns

Thermal Protection (Note 4)

Shutdown Threshold (TJ Increasing)

Hysteresis

TSHDN

THYS

--

150

45

--

C

TOTAL DEVICE

Supply Current After UV Turn--On

Power Switch Enabled

Power Switch Disabled

Non--Fault condition (VFB =2.7 V)

Fault Condition (VFB =2.7 V, VUV =2.0 V)

ICC1

ICC2

ICC3

2.0

--

3.0

1.5

0.65

4.0

2.0

1.2

mA

2. Production testing for NCP1030DMR2 is performed at 25C only; limits at --40C and 125C are guaranteed by design.

3. Oscillator frequency can be externally synchronized to the maximum frequency of the device.

4. Guaranteed by design only.

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