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CS51021A

Enhanced Current Mode PWM Controller

ON Semiconductor 

CS51021A, CS51022A, CS51023A, CS51024A

ELECTRICAL CHARACTERISTICS (Unless otherwise stated, specifications apply for −40°C < TA < 85°C, −40°C < TJ < 150°C,

3.0 V < VC < 20 V, 8.2 V < VCC < 20 V, RT = 12 kW, CT = 390 pF)

Characteristic

Oscillator

Test Conditions

Min

Typ

Max

Unit

Accuracy

Voltage Stability

Temperature Stability

Min Charge & Discharge Time

RT = 12 k, CT = 390 pF

Delta Frequency 8.2 V < VCC < 20 V

TMIN < TA < TMAX, (Note 3)

(Note 3)

230

255

−

2.0

−

8.0

0.333

−

280

kHz

3.0

%

−

%

−

ms

Duty Cycle Accuracy

Peak Voltage

RT = 12 k, CT = 390 pF

(Note 3)

70

77

−

3.0

83

%

−

V

Valley Voltage

(Note 3)

−

1.5

−

V

Valley Clamp Voltage

Discharge Current

10 k Resistor to ground on RTCT

−

1.2

1.4

0.8

1.0

1.6

V

1.2

mA

Discharge Current

TA = 25°C, Note 3

0.925

1.0

1.075

mA

Synchronization (CS51021A/3A)

Input Threshold

−

1.0

1.5

2.7

V

Output Pulsewidth

−

160

260

400

ns

Output High Voltage

Input Resistance

ISYNC = 100 mA

(Note 3)

3.5

4.3

4.8

V

35

70

140

kW

Drive Delay

SYNC to GATE RESET

80

120

150

ns

Output Drive Current

1.0 k Load

1.25

2.0

3.5

mA

SLEEP (CS51022A/4A)

SLEEP Input Threshold

Active High

1.0

1.5

2.7

V

SLEEP Input Current

ICC @ SLEEP

GATE Driver

VSLEEP = 4.0 V

VCC ≤ 15 V

11

25

46

mA

−

50

100

mA

HIGH Voltage

LOW Voltage

Measure VC − GATE, VC = 10 V, 150 mA Load

−

1.5

2.2

V

Measure GATE − PGND, 150 mA SINK

−

1.2

1.5

V

HIGH Voltage Clamp

LOW Voltage Clamp

VC = 20 V, 1.0 nF

Measured at 10 mA Output Current

11

13.5

16

V

−

0.6

0.8

V

Peak Current

UVL Leakage

RISE Time

FALL Time

SLOPE Compensation

VC = 20 V, 1.0 nF, (Note 3)

VC = 20 V measured at 0 V

Load = 1.0 nF, 1.0 V < GATE < 9.0 V,

VC = 20 V, TA = 25°C

Load = 1.0 nF, 9.0 V > GATE > 1 .0 V,

VC = 20 V

−

1.0

−

A

−

−1.0

−50

mA

−

60

100

ns

−

15

40

ns

Charge Current

SLOPE = 2.0 V

−63

−53

−43

mA

COMP Gain

Fraction of slope voltage added to ISENSE,

(Note 3)

0.095

0.100

0.105

V/V

Discharge Voltage

SYNC = 0 V

3. Guaranteed by design, not 100% tested in production.

−

0.1

0.2

V

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