SG1842 データシートの表示（PDF） - Microsemi Corporation

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SG1842

Current Mode PWM Controller

Microsemi Corporation 

Current Mode PWM Controller

Electrical Characteristics

Unless otherwise specified, these specifications apply over the operating ambient temperatures for

SG1842/SG1843 with -55°C ≤ TA ≤ 125°C, SG2842/SG2843 with -25°C ≤ TA ≤ 85°C, SG3842/SG3843 with

0°C ≤ TA ≤ 70°C, VCC = 15V, RT = 10kΩ, and CT = 3.3nF. Low duty cycle pulse testing techniques

are used which maintains junction and case temperatures equal to the ambient temperature.

Symbol

Parameter

Test Conditions

Reference Section

VREF Output Voltage

TJ = 25°C, IO = 1mA

VREG Line Regulation

12V ≤ VIN ≤ 25V

IREG Load Regulation

1 ≤ IO ≤ 20mA

Temperature Stability1

Total Output Variation1 Line, Load, Temperature

VN

Output Noise Voltage1

Long Term Stability1

VREFOSC Output Short Circuit

10Hz ≤ f ≤ 10kHz, TJ =

25°C

TA = 125°C, 1000hrs

Oscillator Section3

f

Initial Accuracy5

TJ = 25°C

fREG

OSCPP

Voltage Stability

Temperature Stability1

Amplitude

12V ≤ VCC ≤ 25V

TMIN ≤ TA ≤ TMAX

VRT/CT (Peak to Peak)

IDSG Discharge Current

TJ = 25°C

TMIN ≤ T A ≤ TMAX

Error Amp Section

EAIN Input Voltage

VCOMP = 2.5V

EAIB Input Bias Current

AVOL Open Loop Gain

2V ≤ VO ≤ 4V

EABW Unity Gain Bandwidth1 TJ = 25°C

PSRR

Power

Ratio

Supply

Rejection

12V

≤

VCC

≤

25V

EASINK Output Sink Current

VVFB = 2.7V,

VCOMP = 1.1V

EASRC Output Source Current VVFB = 2.3V, VCOMP = 5V

EAVOH VOUT High

VVFB = 2.3V,

RL = 15k to GND

EAVOL VOUT Low

VVFB = 2.7V,

RL = 15k to VREF

SG1842/43

SG2842/43

SG3842/43

Units

Min Typ Max Min Typ Max Min Typ Max

4.95 5.00 5.05 4.95 5.00 5.05 4.90 5.00 5.10 V

6 20

6 20

6 20 mV

6 25

6 25

6 25 mV

0.2 0.4

0.2 0.4

0.2 0.4 mV/°C

4.90

5.10 4.90

5.10 4.82

5.18 V

50

50

50

µV

5 25

5 25

5 25 mV

-30 -100 -180 -30 -100 -180 -30 -100 -180 mA

47 52 57 47 52 57 47 52 57 kHz

0.2 1

0.2 1

0.2 1 %

5

5

5

%

1.7

1.7

1.7

V

7.8 8.3 8.8 7.5 8.4 9.3 7.5 8.4 9.3 mA

7.0

9.0 7.2

9.5 7.2

9.5 mA

2.45 2.50 2.55 2.45 2.50 2.55 2.42 2.50 2.58 V

-0.3 -1

-0.3 1

-0.3 -2 µA

65 90

65 90

65 90

dB

0.7 1

0.7 1

0.7 1

MHz

60 70

60 70

60 70

dB

2

6

26

26

mA

-0.5 -0.8

-0.5 -0.8

-0.5 -0.8

mA

5

6

56

56

V

0.7 1.1

0.7 1.1

0.7 1.1 V

6

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