NCP1288 查看數據表（PDF） - ON Semiconductor

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NCP1288

Fixed Frequency Current Mode Controller for Flyback Converters

ON Semiconductor 

NCP1288

ELECTRICAL CHARACTERISTICS (For typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C, VHV = 120 V,

VCC = 11 V unless otherwise noted)

Characteristics

Test Condition

Symbol Min Typ Max Unit

CURRENT SENSE

Input Bias Current

Maximum Internal Current Setpoint

Threshold for Immediate Fault Protection Activation

Propagation Delay from VILIM detection to DRV off

Leading Edge Blanking Duration for VILIM

Leading Edge Blanking Duration for VCS(stop)

Slope of the Compensation Ramp

Soft−Start Duration

OVERPOWER COMPENSATION

VCS = 0.7 V

VFB > 3.5 V

VCS = VILIM

From 1st pulse to

VCS = VILIM

Ibias

VILIM

VCS(stop)

tdelay

tLEB

tBCS

Scomp(65kHz)

tSSTART

−

0.665

0.95

−

190

90

−

2.8

0.02

0.7

1.05

80

250

120

−32.5

4.0

−

0.735

1.15

110

310

150

−

5.2

mA

V

V

ns

ns

ns

mV / ms

ms

VHV to IOPC Conversion Ratio

Current flowing out of CS pin

FB voltage above which IOPC is applied

FB voltage below which IOPC = 0

Refresh period for dc operation

FEEDBACK

VHV = 125 V

VHV = 162 V

VHV = 325 V

VHV = VHV(OV2) − 5 V

KOPC

IOPC(125)

IOPC(162)

IOPC(325)

IOPC(max)

VFB(OPC)

VFB(OPCE)

tWD

−

0.5

− mA / V

−

0

−

mA

−

52

−

−

104

−

102 120 138

1.50 1.65 1.80

V

− 1.25 −

V

25

35

45

ms

Internal Pull−up Resistor

VFB to Internal Current Setpoint Division ratio

Internal Pull−up Voltage on the FB pin

OVERCURRENT PROTECTION

TJ = 25°C

RFB(up)

15

20

25

kW

KFB

4.7 5.0 5.3

−

VFB(ref)

4.3 5.0 5.7

V

Fault Timer Duration

From CS reaching VILIMIT to

tfault

DRV stop

64

78

98

ms

Autorecovery Mode Latch−off Time Duration

tautorec

1.0 1.4 1.8

s

5. Internal supply current only, current in FB pin not included (current flowing through GND pin only).

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