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NJM2379M

PWM SWITCHING REGULATOR CONTROL IC FOR SLAVE TYPE

Japan Radio Corporation  

NJM2379

■ ELECTRICAL CHARACTERISTICS

(V+=6V, RT=33kΩ, CT=1000pF, Ta=25°C OSC:Triangle Waveform, VP-P=0.5V, Offset=0.5V, fOSC=100kHz)

REFERENCE VOLTAGE BLOCK

PARAMETER

SYMBOL

Output Voltage

VREF

Line Regulation

LINE

Load Regulation

LOAD

TEST CONDITION

IOR=1mA

V+=3.6 to 32V, IOR=1mA

IOR=0.1 to 5.0mA

MIN.

2.45

-

-

TYP.

2.50

6.8

5

MAX.

2.55

20.7

30

UNIT

v

mV

mV

OSCILLATOR BLOCK

PARAMETER

Reference Voltage

Input Bias Current

Open Loop Gain

Gain Band width Product

Maximum Output Voltage

(F.B Pin)

Output Source Current

SYMBOL

VB

IB

AV

GB

VOM+

VOM-

IOM+

TEST CONDITION

RNF=100kΩ

RNF=100kΩ

VOM=1V

MIN.

0.51

-

-

-

VREF-0.2

-

40

TYP.

0.52

5

90

0.6

-

-

85

MAX.

0.53

100

-

-

-

200

200

UNIT

V

nA

dB

MHz

V

mV

µA

PWM COMPARATOR BLOCK

PARAMETER

Triangle Waveform Input

Minimum Voltage (CT Pin)

Triangle Waveform Input

Maximum Voltage (CT Pin)

Input Threshold Voltage (F.B Pin)

Input Threshold Voltage (F.B Pin)

Maximum Duty Cycle

SYMBOL

OSCLO

OSCHI

VTH0

VTH50

αM

TEST CONDITION

CT Pin Triangle Waveform Input

CT Pin Triangular Wave Input

duty⋅cycle=0%

duty⋅cycle=50%

F.B Pin=1.2V

MIN.

0

0.7

-

-

55

TYP.

-

-

0.55

0.87

64

MAX.

0.4

1.3

0.65

-

85

UNIT

V

V

V

V

%

SOFT START CIRCUIT BLOCK

PARAMETER

Input Bias Current (CS Pin)

Input Threshold Voltage (CS Pin)

Input Threshold Voltage (CS Pin)

SYMBOL

IBCS

VTHCS0

VTHCS50

TEST CONDITION

duty⋅cycle=0%

duty⋅cycle=50%

MIN.

-

-

-

TYP.

250

0.25

0.52

MAX.

650

0.35

-

UNIT

nA

V

V

Ver.2004-03-03

-3-

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