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CS2845LN8

Current Mode PWM Control Circuit with 50% Max Duty Cycle

ON Semiconductor 

CS2844, CS3844, CS2845, CS3845

MAXIMUM RATINGS*

Rating

Supply Voltage (ICC < 30 mA)

Supply Voltage (Low Impedance Source)

Output Current

Output Energy (Capacitive Load)

Analog Inputs (VFB, Sense)

Error Amp Output Sink Current

Package Thermal Resistance, PDIP–8

Junction–to–Case, RθJC

Junction–to–Ambient, RθJA

Package Thermal Resistance, SO–8

Junction–to–Case, RθJC

Junction–to–Ambient, RθJA

Package Thermal Resistance, SO–14

Junction–to–Case, RθJC

Junction–to–Ambient, RθJA

Package Thermal Resistance, SO–16L

Junction–to–Case, RθJC

Junction–to–Ambient, RθJA

Lead Temperature Soldering:

Wave Solder (through hole styles only) (Note 1)

Reflow (SMD styles only) (Note 2)

1. 10 second maximum.

2. 60 second maximum above 183°C.

*The maximum package power dissipation must be observed.

Value

Self Limiting

30

±1.0

5.0

–0.3 to + 5.5

10

52

100

45

165

30

125

23

105

260 peak

230 peak

Unit

–

V

A

µJ

V

mA

°CW

°CW

°CW

°CW

°CW

°CW

°CW

°CW

°C

°C

ELECTRICAL CHARACTERISTICS (–25° ≤ TA ≤ 85° for CS2844/2845, 0° ≤ TA ≤ 70° for CS3844/CS3845.

VCC = 15 V*; RT = 10 kΩ, CT = 3.3 nF for sawtooth mode; unless otherwise stated.)

CS2844/CS2845

CS3844/CS3845

Characteristic

Reference Section

Test Conditions

Min Typ Max Min Typ Max

Output Voltage

Line Regulation

Load Regulation

Temperature Stability

TJ = 25°C, IREF = 1.0 mA

12 ≤ VCC ≤ 25 V

1.0 ≤ IREF ≤ 20 mA

Note 3.

4.95 5.00 5.05 4.90 5.00 5.10

–

6.0 20

–

6.0 20

–

6.0 25

–

6.0 25

–

0.2 0.4

–

0.2 0.4

Total Output Variation

Line, Load, Temperature. Note 3.

4.90 – 5.10 4.82 – 5.18

Output Noise Voltage

Long Term Stability

Output Short Circuit

Oscillator Section

10 Hz ≤ f ≤ 10 kHz, TJ = 25°C. Note 3.

TA = 125°C, 1000 Hrs. Note 3.

TA = 25°C

–

50

–

–

50

–

–

5.0 25

–

5.0 25

–30 –100 –180 –30 –100 –180

Initial Accuracy

Sawtooth Mode, TJ = 25°C

47

52

57

47

52

57

Voltage Stability

12 ≤ VCC ≤ 25 V

–

0.2 1.0

–

0.2 1.0

Temperature Stability

Sawtooth Mode TMIN ≤ TA ≤ TMAX. Note 3.

–

5.0

–

–

5.0

–

Amplitude

VOSC (peak to peak)

–

1.7

–

3. These parameters, although guaranteed, are not 100% tested in production.

*Adjust VCC above the start threshold before setting at 15 V.

–

1.7

–

Unit

V

mV

mV

mV/°C

V

µV

mV

mA

kHz

%

%

V

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