NCP1212P View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

NCP1212P

Current Mode PWM Controller for Both Forward and Flyback Converters

ON Semiconductor 

NCP1212

ELECTRICAL CHARACTERISTICS (For typical values TJ = 25°C, DMAX = 48%, for min/max values TJ = −25°C to +105°C,

VCC = 16 V unless otherwise noted.)

Characteristic

Symbol

Min Typ Max Unit

OSCILLATOR SECTION

Oscillation Frequency, TJ = 25°C (DMAX = 48%, CT = 1.0 nF)

FOSC−48

81

90

99

kHz

Oscillation Frequency, TJ = 25°C (DMAX = 82%, CT = 1.0 nF)

FOSC−82

72

80

88

kHz

Frequency Change against Supply Voltage

(VCC = 13 V to 25 V, TJ = 25°C)

DFOSC−V

− 0.02 −

%

Frequency Change against Temperature

(VCC = 16 V, TJ = −25°C to 105°C)

DFOSC−T

−

5.0

−

%

CURRENT SENSE SECTION

Maximum Current Sense Input Threshold

VCS

0.96 1.0 1.16

V

Propagation Delay (Current Sense to Gate after LEB Blanking)

TPLH

−

150 200

ns

Leading Edge Blanking Time

SOFT−START SECTION

TLEB

−

300

−

ns

Soft−Start Charge Current

Overload Timing Discharge Current (Note 3)

ISS

ISD−ISS

5.0 8.0 11

mA

15

20

26

mA

48% Duty Cycle Selection Input Voltage Threshold

VD48

−

2.5

−

V

82% Duty Cycle Selection Input Voltage Threshold

VD82

−

3.0

−

V

GATE DRIVER SECTION

Gate Drive Sink Capability, VCC = 15 V, VDRV = 1.0 V

IOL

−

100

−

mA

Gate Drive Source Capability, VCC = 15 V, VDRV = 5.0 V (Note 4)

Gate Drive Voltage (From 1.0 V to 11 V) Rise Time (CL = 1.0 nF, TJ = 25°C)

IOH

−

300

−

mA

Tr

−

25

50

ns

Gate Drive Voltage (From 11 V to 1.0 V) Fall Time (CL = 1.0 nF, TJ = 25°C)

Tf

−

25

50

ns

IC POWER SUPPLY SECTION

VCC Startup Threshold Voltage

VCCTH

13.5 15 16.5

V

VCC Overvoltage Lockout Threshold

VCC Undervoltage Lockout Threshold

Power Supply Current, before Startup (VCC = 12 V)

VCCOVLO

22.5 25 27.5

V

VCCUVLO

8.5 10 11.5

V

IC1

− 0.15 0.26 mA

Power Supply Current, Operating

IC2

−

3.0 5.0

mA

Power Supply Current, Shutdown (VCC = 15 V)

IC3

−

3.0

−

mA

BROWNOUT DETECT SECTION (BOK)

Brownout Input Threshold Voltage

Brownout Hysteresis Current

VBOK

IBOK

1.14 1.21 1.27

V

38

45

54

mA

MAXIMUM DUTY CYCLE SECTION

Maximum Duty Cycle at Soft−Start Pin Voltage between 2.1 V and 2.8 V

(2.1 V v VDMAX v 2.8 V)

DMAX48

47

48

50

%

Maximum Duty Cycle at Soft−Start Pin Voltage Higher than 3.0 V

(VDMAX w 3.0 V)

3. ISD is an internal current source not accessible externally.

4. The output voltage is internally clamped by 13.5 V Zener.

DMAX82

79

82

88

%

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