CS2841B datasheet(3/10 Pages) ONSEMI

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CS2841B

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ELECTRICAL CHARACTERISTICS (−40

°C ≤ TA ≤ 85°C, RT = 680 kW, CT = 0.022 mF for Triangular Mode, VCC = 15 V (Note 3),

RT = 10 kW, CT = 3.3 nF for Sawtooth Mode (see Figure 7); unless otherwise specified.)

Characteristic

Test Conditions

Min

Typ

Max

Unit

Reference Section

Output Voltage

TJ = 25°C, IOUT = 1.0 mA

4.9

5.0

5.1

Line Regulation

8.4

≤ VCC ≤ 16 V

−

6.0

Load Regulation

1.0

≤ IOUT ≤ 20 mA

−

6.0

Temperature Stability

Note 4

−

0.2

0.4

mV/

°C

Total Output Variation

Line, Load, Temp. Note 4

4.82

−

5.18

Output Noise Voltage

10 Hz

≤ f ≤ 10 kHz, TJ = 25°C. Note 4

−

Long Term Stability

TA = 125°C, 1000 Hrs. Note 4

−

5.0

Output Short Circuit

TA = 25°C

−30

−100

−180

Oscillator Section

Initial Accuracy

Sawtooth Mode: TJ = 25°C. See Figure 7.

Sawtooth Mode: −40

°C ≤ TA ≤ +85°C

Triangular Mode: TJ =25°C. See Figure 7.

kHz

Voltage Stability

8.4

≤ VCC ≤ 16 V

−

0.2

1.0

Temperature Stability

Sawtooth Mode: TMIN ≤ TA ≤ TMAX. Note 4

Triangular Mode: TMIN ≤ TA ≤ TMAX. Note 4

−

5.0

8.0

−

Amplitude

VOSC (Peak to Peak)

−

1.7

−

Discharge Current

TJ = 25°C

TMIN ≤ TA ≤ TMAX

7.4

7.2

8.3

−

9.2

9.4

Error Amp Section

Input Voltage

VCOMP = 2.5 V

2.42

2.5

2.58

Input Bias Current

VFB = 0 V

−

−0.3

−2.0

AVOL

2.0

≤ VOUT ≤ 4.0 V

−

Unity Gain Bandwidth

Note 4

0.7

1.0

−

MHz

PSRR

8.4 V

≤ VCC ≤ 16 V

−

Output Sink Current

VFB = 2.7 V, VCOMP = 1.1 V

2.0

6.0

−

Output Source Current

VFB = 2.3 V, VCOMP = 5.0 V

−0.5

−0.8

−

VOUT High

VFB = 2.3 V, RL = 15 kW to Ground

5.0

6.0

−

VOUT Low

VFB = 2.7 V, RL = 15 kW to VREF

−

0.7

1.1

Current Sense Section

Gain

Notes 5 and 6

2.85

3.0

3.15

V/V

Maximum Input Signal

VCOMP = 5.0 V. Note 5

0.9

1.0

1.1

PSRR

12 V

≤ VCC ≤ 25 V. Note 5

−

Input Bias Current

VSense = 0 V

−

−2.0

−10

Delay to Output

TJ = 25°C. Note 4

−

150

300

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

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

5. Parameter measured at trip point of latch with VFB = 0

6. Gain defined as:

+ D

VCOMP

DVSense

v VSense v 0.8 V.

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