CS3842A datasheet(4/10 Pages) ONSEMI

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CS2842A, CS3842A, CS2843A, CS3843A

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ELECTRICAL CHARACTERISTICS (continued) (−25° ≤ TA ≤ 85° for CS2842A/CS2843A, 0° ≤ TA ≤ 70° for CS3842A/CS3843A.

VCC = 15 V*; RT = 680 Ω, CT = 0.022 μF for triangular mode, RT = 10 kΩ, CT = 3.3 nF for sawtooth mode (see Figure 7);

unless otherwise stated.)

Characteristic

Test Conditions

CS2842A/CS2843A

CS3842A/CS3843A

Unit

Min

Typ

Max

Min

Typ

Max

Error Amp Section

Input Voltage

VCOMP = 2.5 V

2.45

2.50

2.55

2.42

2.50

2.58

Input Bias Current

VFB = 0

−

−0.3

−1.0

−

−0.3

−2.0

μA

AVOL

2.0 ≤ VOUT ≤ 4.0 V

−

Unity Gain Bandwidth

Note 4.

0.7

1.0

−

0.7

1.0

−

MHz

PSRR

12 ≤ VCC ≤ 25 V

−

Output Sink Current

VFB = 2.7 V, VCOMP = 1.1 V

2.0

6.0

−

2.0

6.0

−

Output Source Current

VFB = 2.3 V, VCOMP = 5.0 V

−0.5

−0.8

−

−0.5

−0.8

−

VOUT High

VFB = 2.3 V, 15 kΩ to ground

5.0

6.0

−

5.0

6.0

−

VOUT Low

VFB = 2.7 V, 15 kΩ to VREF

−

0.7

1.1

−

0.7

1.1

Current Sense Section

Gain

Notes 5 & 6.

2.85

3.00

3.15

2.85

3.00

3.15

V/V

Maximum Input Signal

VCOMP = 5.0 V (Note 5.)

0.9

1.0

1.1

0.9

1.0

1.1

PSRR

12 ≤ VCC ≤ 25 V (Note 5.)

−

Input Bias Current

VSENSE = 0

−

−2.0

−10

−

−2.0

−10

μA

Delay to Output

TJ = 25°C (Note 4.)

−

150

300

−

150

300

Output Section

Output Low Level

ISINK = 20 mA

ISINK = 200 mA

−

0.1

1.5

0.4

2.2

−

0.1

1.5

0.4

2.2

Output High Level

ISOURCE = 20 mA

ISOURCE = 200 mA

13.5

−

13.5

−

Rise Time

TJ = 25°C, CL = 1.0 nF (Note 4.)

−

150

−

150

Fall Time

TJ = 25°C, CL = 1.0 nF (Note 4.)

−

150

−

150

Output Leakage

UVLO Active, VOUT = 0

−

−0.01 −10.00

−

−0.01 −10.00

μA

Total Standby Current

Startup Current

−

0.5

1.0

−

0.5

1.0

Operating Supply Current

VFB = VSENSE = 0 V,

RT = 10 kΩ, CT = 3.3 nF

−

VCC Zener Voltage

ICC = 25 mA

−

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

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

6. Gain defined as: A = ΔVCOMP/ΔVSENSE; 0 ≤ VSENSE ≤ 0.8 V.

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

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