NCP1236DD65R2G datasheet(6/34 Pages) ONSEMI

Part #	NCP1236DD65R2G

Description	Fixed Frequency Current Mode Controller for Flyback Converters

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1236

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6

ELECTRICAL CHARACTERISTICS (continued)

(For typical values TJ = 25C, for min/max values TJ = −40C to +125C, VHV = 125 V, VCC = 11 V unless otherwise noted)

Characteristics

Unit

Max

Typ

Min

Symbol

Test Condition

OUTPUT DRIVER

High−state voltage drop

VCC = VCC(min) + 0.2 V, RDRV = 33 kW,

DRV high

VDRV(drop)

−

1

V

CURRENT SENSE

Input Bias Current

VCS = 0.7 V

Ibias

−

0.02

−

mA

Maximum internal current

setpoint

VFB > 3.5 V

VILIM

0.66

0.7

0.74

V

Propagation delay from VIlimit

detection to DRV off

VCS = VILIM

tdelay

−

80

110

ns

Leading Edge Blanking Duration

for VILIM

tLEB

190

250

310

ns

Threshold for immediate fault

protection activation

VCS(stop)

0.95

1.05

1.15

V

Leading Edge Blanking Duration

for VCS(stop)

tBCS

90

120

150

ns

Slope of the compensation ramp

Scomp(65kHz)

Scomp(100kHz)

−

−32.5

−50

−

mV /

ms

Soft−start duration

From 1st pulse to VCS = VILIM

tSSTART

2.8

4.0

5.2

ms

OVERPOWER COMPENSATION

VHV to IOPC conversion ratio

KOPC

−

0.54

−

mA / V

Current flowing out of CS pin

VHV = 125 V

VHV = 162 V

VHV = 325 V

VHV = 365 V

IOPC(125)

IOPC(162)

IOPC(325)

IOPC(365)

−

105

0

20

110

130

−

150

mA

FB voltage above which IOPC is

applied

VHV = 365 V

VFB(OPCF)

2.12

2.35

2.58

V

FB voltage below which is no

IOPC applied

VHV = 365 V

VFB(OPCE)

−

2.15

−

V

Watchdog timer for dc operation

tWD(OPC)

−

32

−

ms

FEEDBACK

Internal pull−up resistor

TJ = 25C

RFB(up)

15

20

25

kW

VFB to internal current setpoint

division ratio

KFB

4.7

5

5.3

−

Internal pull−up voltage on the

FB pin

VFB(ref)

4.3

5

5.7

V

OVERCURRENT PROTECTION

Fault timer duration

From CS reaching VILIMIT to DRV stop

tfault

98

128

168

ms

Fault timer duration (for the C

version only)

From CS reaching VILIMIT to DRV stop

tfault

16

32

48

ms

Autorecovery mode latch−off

time duration

tautorec

0.85

1.00

1.35

s

Autorecovery mode latch−off

time duration (for the C version

only)

tautorec

1.0

1.5

2.0

s

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

7. Guaranteed by design.

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NCP1236DD65R2G Datasheet(PDF) 6 Page - ON Semiconductor

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