ON Semiconductor CS51021A, CS51022A, CS51023A, CS51024A Technical data

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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)

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SO–16

PIN CONNECTIONS AND

MARKING DIAGRAM

GATE

SLEEP or SYNC

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.

SENSE

SLOPE

TCT

SET

x = Specific Device Code A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W = Work Week

ORDERING INFORMATION*

Device Package Shipping

D SUFFIX

CASE 751B

CS5102xA

AWLYWW

PGNDI V

REF

LGNDUV SSOV

COMPR V

 Semiconductor Components Industries, LLC, 2001

September, 2001 – Rev. 5

1 Publication Order Number:

CS51021A/D

PGND

(36 V to 72 V)

51 k

CS51021A, CS51022A, CS51023A, CS51024A

100

BAS21

1.0 µF

SYNC/SLEEP

0.01 µF

11 V

10 k

330 pF

4700 pF

51 k

0.01 µF

FZT688

22 k

22 µF

REF

COMP V

RTC

SYNC/ SLEEP

LGND

10 K

18 V

UV OV

SET

SLOPE

GATE

SENSE

CS51021A/2A

PGND

470 pF

1.0 K

24.3 k,

1.0%

6.98 k,

1.0%

200 k,

1.0%

2.49 k,

1.0%

IRF6345

6.98 k,

1.0%

180

MOC81025

BA521

100

100 p

TL431

10 k

100:1

1.0 k

4:1

5.1 k0.1 µF

1000 pF

680 pF

2.0 k,

1.0%

2:5

100 µF 100 µF

2.0 k, 1.0%

OUT

(5 V/5 A)

SGND

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, V Driver Supply Voltage, V SYNC, SLEEP, RTCT, SOFT START, VFB, SLOPE, I

SENSE

, UV, OV, I

(Logic Pins) 0.25 to V

SET

Peak GATE Output Current 1.0 A Steady State Output Current ±0.2 A Operating Junction Temperature, T Storage Temperature Range, T

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.

–0.3, 20 V –0.3, 20 V

REF

150 °C

–65 to +150 °C

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CS51021A, CS51022A, CS51023A, CS51024A

ELECTRICAL CHARACTERISTICS (Unless otherwise stated, specifications apply for –40°C < T

–40°C < T

< 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

< 85°C,

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 < UV ICC @ Startup (CS51023A/4A) VCC < UV

Threshold – 40 75 µA

START

Threshold – 45 75 µA

START

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, I Total Accuracy 1.0 mA < I Line Regulation 8.2 V < VCC < 18 V, I Load Regulation 1.0 mA < I

= 2.0 mA, VCC = 14 V, Note 2 4.95 5.0 5.05 V

REF

< 10 mA 4.9 5.0 5.15 V

REF

= 2.0 mA – 6.0 20 mV

REF

< 10 mA – 6.0 15 mV

REF

NOISE Voltage Note 2 – 50 – µV OP Life Shift T = 1000 Hours, Note 2 – 4.0 20 mV FAULT Voltage Force V OK Voltage Force V OK Hysteresis Force V Current Limit Force V

REF

0.90 × V

0.94 × V

REF

0.93 × V

0.96 × V

REF

0.95 × V

0.985 × V

REF

75 165 250 mV

–20 – – mA

REF

Error Amplifier

Initial Accuracy TA = 25°C, I

= COMP, Note 2

= 2.0 mA, VCC = 14 V,

REF

2.465 2.515 2.565 V

Reference Voltage VFB = COMP 2.440 2.515 2.590 V VFB Leakage Current VFB = 0 V – –0.2 –2.0 µA 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, V I

Clamp Note 2 0.95 1.0 1.15 V

LIM(SET)

COMP

VSS = 2.5 V, VFB = 0 V, I

= 2.0 V 2.4 2.5 2.6 V

SET

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

V V

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CS51021A, CS51022A, CS51023A, CS51024A

ELECTRICAL CHARACTERISTICS (continued) (Unless otherwise stated, specifications apply for –40°C < T

–40°C < T

< 150°C, 3.0 V < VC < 20 V, 8.2 V < VCC < 20 V, RT = 12 kΩ, CT = 390 pF)

< 85°C,

Characteristic UnitMaxTypMinTest Conditions

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 T

< TA < T

MIN

Note 3 – 8.0 – %

MAX,

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 RTC

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 I

= 100 µA 3.5 4.3 4.8 V

SYNC

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 V

= 4.0 V 11 25 46 µA

SLEEP

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,

= 20 V, TA = 25°C

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

= 20 V

– 60 100 ns

– 15 40 ns

SLOPE Compensation

Charge Current SLOPE = 2.0 V –63 –53 –43 µA COMP Gain Fraction of slope voltage added to I

SENSE

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.

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