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NCP1205

Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback

ON Semiconductor 

NCP1205

MAXIMUM RATINGS

Pin No.

Value

Rating

PDIP−8 PDIP−14 SOIC−16 Symbol

Min

Max

Unit

Power Supply Voltage

8

Thermal Resistance Junction−to−Air PDIP−8

−

PDIP−14

−

SOIC−16

−

13

14

Vin

−

−

−

RqJA

−

−

−

−

−

−

30

V

100

°C/W

100

145

Operating Junction Temperature Range

Maximum Junction Temperature

Storage Temperature Range

ESD Capability, HBM Model

−

−

−

All Pins

−

−

−

All Pins

−

−

−

All Pins

TJ

TJmax

Tstg

−

−

−25 to +125 °C

−

150

°C

−

−60 to +150 °C

−

2.0

kV

ESD Capability, Machine Model

All Pins All Pins All Pins

−

−

200

V

Demagnetization Pin Current

2

3

4

−

−

−5.0/+10

mA

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

ELECTRICAL CHARACTERISTICS (For typical values TA = 25°C, for min/max values TJ = −25°C to +125°C, Max TJ = 150°C,

VCC = 12 V unless otherwise noted.)

Pin No.

Characteristics

PDIP−8 PDIP−14 SOIC−16 Symbol Min Typ Max Unit

Demagnetization Block

Input Threshold Voltage (Vpin2 increasing)

Hysteresis (Vpin2 decreasing)

Input Clamp Voltage

High State (Ipin2 = 3.0 mA)

Low State (Ipin2 = −3.0 mA)

Demag Propagation Delay

2

3

2

3

2

3

−

−

No Demag Signal Activation

−

−

Internal Input Capacitance at 1.0 V

2

3

Demag Propagation Delay with 22 kW External Resistor

2

3

4

Vth

50

65

85 mV

4

VH

−

30

−

mV

4

V

VCH

VCL

8.0

10

12

−0.9 −0.7 −0.5

−

−

100 300 350 ns

−

−

−

4.0 8.0 ms

4

Cpin2

−

10

−

pF

4

−

100 370 480 ns

Feedback Path

Input Impedance at VFB = 3.0 V

Internal Error Amplifier Closed Loop Gain

3

4

3

4

Internal Built−In Offset Voltage for Error Detection

−

−

Error Amplifier Level of VCO Take Over

−

−

Internal Divider from Internal Error Amp, Pin to Current

−

−

Setpoint

5

Zin

−

50

−

kW

5

AVCL

− −3.0 −

−

−

Vref

2.2 2.5 2.8

V

−

−

−

1.0

−

V

−

−

−

3.0

−

−

Fault Detection Circuitry

Internal Over Current Level

−

−

Fault Time Duration to Latch Activation @ Ct = 1.0 ηF

−

−

Over Current Latchoff Phase @ Ct = 1.0 ηF

−

−

Hysteresis when VFB goes back into Regulation

Overvoltage Protection Threshold for PDIP−14 and

SOIC−16 versions

−

−

6

−

−

WLL

−

1.5

−

V

−

−

−

128

−

ms

−

−

−

1.0

−

s

−

−

−

100

−

mV

7

OVP1 2.5 2.8 3.1

V

Current Sense Comparator

Input Bias Current @ 1.0 V

Maximum Current Setpoint

Minimum Current Setpoint

6

11

12

IIB

− 0.02 −

mA

6

11

12

Vcl

0.9 1.0 1.1

V

6

11

12

Vmin

225 250 285 mV

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