ON Semiconductor CS51021A, CS51022A, CS51023A, CS51024A Technical data

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CS51021A

CS51021A, CS51022A, CS51023A, CS51024A

Enhanced Current Mode

PWM Controller

The CS51021A/2A/3A/4A Fixed Frequency PWM Current Mode Controller family provides all necessary features required for AC±DC or DC±DC primary side control. Several features are included eliminating the additional components needed to implement them externally. In addition to low start±up current (75 μA) and high frequency operation capability, the CS51021A/2A/3A/4A family includes overvoltage and undervoltage monitoring, externally programmable dual threshold overcurrent protection, current sense leading edge blanking, current slope compensation, accurate duty cycle control and an externally available 5.0 V reference. The CS51021A and CS51023A feature bidirectional synchronization capability, while the CS51022A and CS51024A offer a sleep mode with 100 μA maximum IC current consumption. The CS51021A/2A/3A/4A family is available in a 16 lead narrow body SO package.

Device

Sleep/Synch

VCC Start/Stop

CS51021A

Synch

8.25 V/7.7 V

 

 

 

CS51022A

Sleep

8.25 V/7.7 V

 

 

 

CS51023A

Synch

13 V/7.7 V

 

 

 

CS51024A

Sleep

13 V/7.7 V

 

 

 

Features

75 μA Max. Startup Current

Fixed Frequency Current Mode Control

1.0 MHz Switching Frequency

Undervoltage Protection Monitor

Overvoltage Protection Monitor with Programmable Hysteresis

Programmable Dual Threshold Overcurrent Protection with Delayed Restart

Programmable Soft Start

Accurate Maximum Duty Cycle Limit

Programmable Slope Compensation

Leading Edge Current Sense Blanking

1.0 A Sink/Source Gate Drive

Bidirectional Synchronization (CS51021A/3A)

50 ns PWM Propagation Delay

100 μA Max Sleep Current (CS51022A/4A)

 

http://onsemi.com

 

SO±16

16

D SUFFIX

CASE 751B

 

1

PIN CONNECTIONS AND

MARKING DIAGRAM

GATE

1

 

 

16

VC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ISENSE

 

 

AWLYWW

CS5102xA

 

 

 

PGND

 

 

 

 

 

SLEEP or SYNC

 

 

 

 

 

VCC

 

 

 

 

 

 

 

SLOPE

 

 

 

 

 

 

 

VREF

 

 

 

 

 

 

 

UV

 

 

 

 

 

 

 

LGND

 

 

 

 

 

 

 

OV

 

 

 

 

 

 

 

SS

 

 

 

 

 

 

 

RTCT

 

 

 

 

 

 

 

COMP

 

 

 

 

 

 

 

ISET

 

 

 

 

 

 

 

VFB

 

 

 

 

 

 

 

x

 

= Specific Device Code

A

 

= Assembly Location

WL, L = Wafer Lot

 

YY, Y

 

= Year

 

 

 

 

 

WW, W = Work Week

 

ORDERING INFORMATION*

Device

Package

Shipping

 

 

 

CS51021AED16

SO±16

48 Units/Rail

 

 

 

CS51021AEDR16

SO±16

2500 Tape & Reel

 

 

 

CS51022AED16

SO±16

48 Units/Rail

 

 

 

CS51022AEDR16

SO±16

2500 Tape & Reel

 

 

 

CS51023AED16

SO±16

48 Units/Rail

 

 

 

CS51023AEDR16

SO±16

2500 Tape & Reel

 

 

 

CS51024AED16

SO±16

48 Units/Rail

 

 

 

CS51024AEDR16

SO±16

2500 Tape & Reel

 

 

 

* Consult your local sales representative for other package options.

Semiconductor Components Industries, LLC, 2001

1

Publication Order Number:

September, 2001 ± Rev. 5

 

CS51021A/D

ON Semiconductor CS51021A, CS51022A, CS51023A, CS51024A Technical data

 

 

CS51021A, CS51022A, CS51023A, CS51024A

 

 

 

 

 

 

 

 

100

 

 

 

 

 

 

VIN

 

 

 

 

 

 

 

 

 

 

 

 

(36 V to 72 V)

 

 

 

 

 

 

 

 

 

 

 

 

PGND

51 k

 

 

 

BAS21

1.0 μF

 

 

 

 

 

SYNC/SLEEP

 

22 μF

 

18 V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11 V

 

 

 

 

 

 

 

 

100:1

 

 

 

 

FZT688

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

200 k,

 

 

 

 

 

2:5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24.3 k,

1.0%

 

10 k

4:1

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

1.0%

 

 

 

 

 

VOUT

 

 

 

 

 

 

 

 

 

 

0.01 μF

4700 pF

 

 

 

 

 

 

 

 

 

 

VC

 

VCC

 

2.49 k,

 

 

 

10

 

(5 V/5 A)

 

 

 

 

 

 

 

 

 

 

22 k

VREF

CS51021A/2A

UV

 

1.0%

 

 

 

 

 

 

 

 

 

 

 

 

 

10 k

51 k

COMP

OV

 

 

BA521

 

 

 

 

 

 

 

VFB

 

ISET

 

 

 

 

 

100 μF

100 μF

 

 

 

 

 

 

 

 

680 pF

 

 

RTCT

 

SLOPE

 

IRF6345

 

 

 

 

 

 

 

 

 

 

 

 

SGND

 

 

SYNC/

 

GATE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SLEEP

 

ISENSE

6.98 k,

6.98 k,

100

 

 

 

 

 

330 pF

 

CSS

 

PGND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LGND

 

 

1.0%

1.0%

 

62

 

 

 

 

 

0.01 μF

 

 

 

470 pF

 

100 p

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.1 μF

5.1 k

 

 

 

 

 

 

 

 

 

 

TL431

 

 

 

 

 

 

 

 

 

 

180

 

 

 

1000 pF

2.0 k, 1.0%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.0 k

2.0 k,

 

 

 

 

 

 

 

 

 

 

 

1.0%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10 K

 

 

 

MOC81025

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.0 K

 

 

 

 

 

 

 

Figure 1. Typical Application Diagram, 36±72 V to 5.0 V, 5.0 A DC±DC Converter

MAXIMUM RATINGS*

 

Rating

Value

Unit

 

 

 

 

Power Supply Voltage, VCC

 

±0.3, 20

V

 

 

 

 

Driver Supply Voltage, VC

 

±0.3, 20

V

 

 

 

SYNC, SLEEP, RTCT, SOFT START, VFB, SLOPE, ISENSE, UV, OV, ISET (Logic Pins)

0.25 to VREF

V

 

 

 

 

Peak GATE Output Current

 

1.0

A

 

 

 

 

Steady State Output Current

 

±0.2

A

 

 

 

 

Operating Junction Temperature, TJ

 

150

°C

 

 

 

 

Storage Temperature Range, TS

 

±65 to +150

°C

 

 

 

 

ESD (Human Body Model)

 

2.0

kV

 

 

 

 

Lead Temperature Soldering:

Reflow: (SMD styles only) (Note 1)

230 peak

°C

 

 

 

 

1. 60 second maximum above 183°C.

*The maximum package power dissipation must be observed.

http://onsemi.com

2

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

Test Conditions

Min

Typ

Max

Unit

 

 

 

 

 

 

Under Voltage Lockout

 

 

 

 

 

 

 

 

 

 

 

START Threshold (CS51021A/2A)

±

7.95

8.25

8.8

V

 

 

 

 

 

 

START Threshold (CS51023A/4A)

±

12.4

13

13.4

V

 

 

 

 

 

 

STOP Threshold

±

7.4

7.7

8.2

V

 

 

 

 

 

 

Hysteresis (CS51021A/2A)

±

0.50

0.75

1.00

V

 

 

 

 

 

 

Hysteresis (CS51023A/4A)

±

4.0

5.0

6.0

V

 

 

 

 

 

 

ICC @ Startup (CS51021A/2A)

VCC < UVSTART Threshold

±

40

75

mA

 

 

 

 

 

 

ICC @ Startup (CS51023A/4A)

VCC < UVSTART Threshold

±

45

75

mA

 

 

 

 

 

 

ICC Operating (CS51021A/3A)

±

±

7.0

9.0

mA

 

 

 

 

 

 

ICC Operating (CS51022A/4A)

±

±

6.0

8.0

mA

 

 

 

 

 

 

ICC Operating

Includes 1.0 nF Load

±

7.0

12

mA

Voltage Reference

 

 

 

 

 

 

 

 

 

 

 

Initial Accuracy

TA = 25°C, IREF = 2.0 mA, VCC = 14 V, Note 2

4.95

5.0

5.05

V

 

 

 

 

 

 

Total Accuracy

1.0 mA < IREF < 10 mA

4.9

5.0

5.15

V

 

 

 

 

 

 

Line Regulation

8.2 V < VCC < 18 V, IREF = 2.0 mA

±

6.0

20

mV

 

 

 

 

 

 

Load Regulation

1.0 mA < IREF < 10 mA

±

6.0

15

mV

 

 

 

 

 

 

NOISE Voltage

Note 2

±

50

±

mV

 

 

 

 

 

 

OP Life Shift

T = 1000 Hours, Note 2

±

4.0

20

mV

 

 

 

 

 

 

FAULT Voltage

Force VREF

0.90 × VREF

0.93 × VREF

0.95 × VREF

V

 

 

 

 

 

 

OK Voltage

Force VREF

0.94 × VREF

0.96 × VREF

0.985 × VREF

V

 

 

 

 

 

 

OK Hysteresis

Force VREF

75

165

250

mV

 

 

 

 

 

 

Current Limit

Force VREF

±20

±

±

mA

 

 

 

 

 

 

Error Amplifier

 

 

 

 

 

 

 

 

 

 

 

Initial Accuracy

TA = 25°C, IREF = 2.0 mA, VCC = 14 V,

2.465

2.515

2.565

V

 

VFB = COMP, Note 2

 

 

 

 

Reference Voltage

VFB = COMP

2.440

2.515

2.590

V

 

 

 

 

 

 

VFB Leakage Current

VFB = 0 V

±

±0.2

±2.0

mA

 

 

 

 

 

 

Open Loop Gain

1.4 V < COMP < 4.0 V, Note 2

60

90

±

dB

 

 

 

 

 

 

Unity Gain Bandwidth

Note 2

1.5

2.5

±

MHz

 

 

 

 

 

 

COMP Sink Current

COMP = 1.5 V, VFB = 2.7 V

2.0

6.0

±

mA

 

 

 

 

 

 

COMP Source Current

COMP = 1.5 V, VFB = 2.3 V

±0.2

±0.5

±

mA

 

 

 

 

 

 

COMP High Voltage

VFB = 2.3 V

4.35

4.8

5.0

V

 

 

 

 

 

 

COMP Low Voltage

VFB = 2.7 V

0.4

0.8

1.2

V

 

 

 

 

 

 

PS Ripple Rejection

FREQ = 120 Hz, Note 2

60

85

±

dB

 

 

 

 

 

 

SS Clamp, VCOMP

VSS = 2.5 V, VFB = 0 V, ISET = 2.0 V

2.4

2.5

2.6

V

 

 

 

 

 

 

ILIM(SET) Clamp

Note 2

0.95

1.0

1.15

V

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

http://onsemi.com

3

CS51021A, CS51022A, CS51023A, CS51024A

ELECTRICAL CHARACTERISTICS (continued) (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 kΩ, CT = 390 pF)

Characteristic

Test Conditions

Min

Typ

Max

Unit

 

 

 

 

 

 

Oscillator

 

 

 

 

 

 

 

 

 

 

 

Accuracy

RT = 12 k, CT = 390 pF

230

255

280

kHz

 

 

 

 

 

 

Voltage Stability

Delta Frequency 8.2 V < VCC < 20 V

±

2.0

3.0

%

 

 

 

 

 

 

Temperature Stability

TMIN < TA < TMAX, Note 3

±

8.0

±

%

 

 

 

 

 

 

Min Charge & Discharge Time

Note 3

0.333

±

±

μs

 

 

 

 

 

 

Duty Cycle Accuracy

RT = 12 k, CT = 390 pF

70

77

83

%

 

 

 

 

 

 

Peak Voltage

Note 3

±

3.0

±

V

 

 

 

 

 

 

Valley Voltage

Note 3

±

1.5

±

V

 

 

 

 

 

 

Valley Clamp Voltage

10 k Resistor to ground on RTCT

1.2

1.4

1.6

V

 

 

 

 

 

 

Discharge Current

±

0.8

1.0

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

ISYNC = 100 μA

3.5

4.3

4.8

V

 

 

 

 

 

 

Input Resistance

Note 3

35

70

140

kΩ

 

 

 

 

 

 

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

VSLEEP = 4.0 V

11

25

46

μA

 

 

 

 

 

 

ICC @ SLEEP

VCC 15 V

±

50

100

μA

 

 

 

 

 

 

GATE Driver

 

 

 

 

 

 

 

 

 

 

 

HIGH Voltage

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

±

1.5

2.2

V

 

 

 

 

 

 

LOW Voltage

Measure GATE ± PGND, 150 mA SINK

±

1.2

1.5

V

 

 

 

 

 

 

HIGH Voltage Clamp

VC = 20 V, 1.0 nF

11

13.5

16

V

 

 

 

 

 

 

LOW Voltage Clamp

Measured at 10 mA Output Current

±

0.6

0.8

V

 

 

 

 

 

 

Peak Current

VC = 20 V, 1.0 nF, Note 3

±

1.0

±

A

 

 

 

 

 

 

UVL Leakage

VC = 20 V measured at 0 V

±

±1.0

±50

μA

 

 

 

 

 

 

RISE Time

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

±

60

100

ns

 

VC = 20 V, TA = 25°C

 

 

 

 

FALL Time

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

±

15

40

ns

 

VC = 20 V

 

 

 

 

SLOPE Compensation

 

 

 

 

 

 

 

 

 

 

 

Charge Current

SLOPE = 2.0 V

±63

±53

±43

μA

 

 

 

 

 

 

COMP Gain

Fraction of slope voltage added to ISENSE,

0.095

0.100

0.105

V/V

 

Note 3

 

 

 

 

 

 

 

 

 

 

Discharge Voltage

SYNC = 0 V

±

0.1

0.2

V

 

 

 

 

 

 

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

http://onsemi.com

4

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