Datasheet SG3526N Datasheet (Motorola)

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The SG3526 is a high performance pulse width modulator integrated circuit intended for fixed frequency switching regulators and other power control applications.

Functions included in this IC are a temperature compensated voltage reference, sawtooth oscillator, error amplifier, pulse width modulator, pulse metering and steering logic, and two high current totem pole outputs ideally suited for driving the capacitance of power FETs at high speeds.

Additional protective features include soft start and undervoltage lockout, digital current limiting, double pulse inhibit, adjustable dead time and a data latch for single pulse metering. All digital control ports are TTL and B–series CMOS compatible. Active low logic design allows easy wired–OR connections for maximum flexibility. The versatility of this device enables implementation in single–ended or push–pull switching regulators that are transformerless or transformer coupled. The SG3526 is specified over a junction temperature range of 0° to +125°C.

• 8.0 V to 35 V Operation

• 5.0 V ±1% Trimmed Reference

• 1.0 Hz to 400 kHz Oscillator Range

• Dual Source/Sink Current Outputs: ±100 mA

• Digital Current Limiting

• Programmable Dead Time

• Undervoltage Lockout

• Single Pulse Metering

• Programmable Soft–Start

• Wide Current Limit Common Mode Range

• Guaranteed 6 Unit Synchronization

Representative Block Diagram

18

V

ref

V

CC

Ground

Sync

R

Deadtime

R

T

C

T

Reset

C

Soft–Start Compensation

+Error –Error

+C.S. –C.S.

Shutdown

Reference

17

Regulator

15

12

11

9

Oscillator

10

5

4

1 2

7 6

8

3

Soft

Start

V

CC

+

–

+

–

Amp

Under– Voltage Lockout

T o Internal

Circuitry

–

+

S

Q

D

Q

Metering

F/F

Memory

F/F

S

RQ

Toggle

F/F

Q

T

Q

14

13

Output

A

16

Output

B

V

PULSE WIDTH MODULATION

CONTROL CIRCUIT

SEMICONDUCTOR

TECHNICAL DATA

18

1

N SUFFIX

PLASTIC PACKAGE

CASE 707

PIN CONNECTIONS

+Error

1

–Error

2

Compensation

C

Soft–Start

C

Shutdown

ORDERING INFORMATION

Device

SG3526N TJ = 0° to +125°C Plastic DIP

3 4 5

Reset

6

–CS

7

+CS

8

R

9

T

(Top View)

Operating

Temperature Range

18 17 16 15 14 13 12 11 10

V

ref

V

CC

Output B Ground V

C

Output A Sync R

Deadtime

C

T

Package

MOTOROLA ANALOG IC DEVICE DATA

 Motorola, Inc. 1996 Rev 2

1

SG3526

MAXIMUM RATINGS

Supply Voltage V Collector Supply Voltage V Logic Inputs –0.3 to +5.5 V Analog Inputs –0.3 to V Output Current, Source or Sink I Reference Load Current (VCC = 40 V, Note 2) I Logic Sink Current 15 mA Power Dissipation

TA = +25°C (Note 3)

TC = +25°C (Note 4) Thermal Resistance Junction–to–Air R Thermal Resistance Junction–to–Case R Operating Junction Temperature T Storage Temperature Range T Lead Temperature (Soldering, 10 Seconds) T

NOTES: 1. Values beyond which damage may occur.

2.Maximum junction temperature must be observed.

3.Derate at 10 mW/°C for ambient temperatures above +50°C.

4.Derate at 24 mW/°C for case temperatures above +25°C.

(Note 1)

Rating Symbol Value Unit

CC

C

O

ref

P

D

θJA θJC

J

stg

Solder

+40 Vdc +40 Vdc

CC

±200 mA

50 mA

1000 3000

100 °C/W

42 °C/W

+150 °C

–65 to +150 °C

±300 °C

V

mW

RECOMMENDED OPERATING CONDITIONS

Characteristics Symbol Min Max Unit

Supply Voltage V Collector Supply Voltage V Output Sink/Source Current (Each Output) I Reference Load Current I Oscillator Frequency Range f Oscillator Timing Resistor R Oscillator Timing Capacitor C Available Deadtime Range (40 kHz) – 3.0 50 % Operating Junction Temperature Range T

CC

C

O

ref

osc

T

J

8.0 35 Vdc

4.5 35 Vdc 0 ±100 mA 0 20 mA

0.001 400 kHz

2.0 150 kΩ

0.001 20 µF

0 +125 °C

2

MOTOROLA ANALOG IC DEVICE DATA

SG3526

ELECTRICAL CHARACTERISTICS (V

Characteristics

= +15 Vdc, TJ = T

CC

low

to T

[Note 5], unless otherwise noted.)

high

Symbol Min Typ Max Unit

REFERENCE SECTION (Note 6)

Reference Output Voltage (TJ = +25°C) V Line Regulation (+8.0 V ≤ VCC ≤ +35 V) Reg Load Regulation (0 mA ≤ IL ≤ 20 mA) Reg T emperature Stability ∆V Total Reference Output Voltage V ariation

∆V

(+8.0 V ≤ VCC ≤ +35 V, 0 mA ≤ IL ≤ 20 mA)

Short Circuit Current (V

= 0 V) (Note 2) I

ref

line

load

/∆T – 10 – mV

ref

SC

4.90 5.00 5.10 V – 10 30 mV – 10 50 mV

4.85 5.00 5.15 V

25 80 125 mA

UNDERVOLTAGE LOCKOUT

Reset Output Voltage (V Reset Output Voltage (V

= +3.8 V) – 0.2 0.4 V

ref

= +4.8 V) 2.4 4.8 – V

ref

OSCILLATOR SECTION (Note 7)

Initial Accuracy (TJ = +25°C) – ±3.0 ±8.0 % Frequency Stability over Power Supply Range

(+8.0 V ≤ VCC ≤ +35 V)

Frequency Stability over Temperature

(∆TJ = T

low

to T

high

)

Minimum Frequency

(RT = 150 kΩ, CT = 20 µF)

Maximum Frequency

(RT = 2.0 kΩ, CT = 0.001 µF) Sawtooth Peak Voltage (VCC = +35 V) V Sawtooth Valley Voltage (VCC = +8.0 V) V

∆f

osc

∆

V

CC

∆f

osc

∆ T

J

f

min

f

max

(P) – 3.0 3.5 V

osc

(V) 0.45 0.8 – V

osc

– 0.5 1.0 %

– 2.0 – %

– 0.5 – Hz

400 – – kHz

ERROR AMPLIFIER SECTION (Note 8)

Input Offset Voltage (RS ≤ 2.0 kΩ) V Input Bias Current I Input Offset Current I DC Open Loop Gain (RL ≥ 10 MΩ) A High Output Voltage

(V

Pin 1–VPin 2

≥ +150 mV, I

source

= 100 µA)

Low Output Voltage

(V

Pin 2–VPin 1

≥ +150 mV, I

= 100 µA)

sink

VOL

V

IO IB IO

OH

OL

– 2.0 10 mV – –350 –2000 nA – 35 200 nA

60 72 – dB

3.6 4.2 – V

– 0.2 0.4 V

Common Mode Rejection Ratio (RS ≤ 2.0 kΩ) CMRR 70 94 – dB Power Supply Rejection Ratio (+12 V ≤ VCC ≤ +18 V) PSRR 66 80 – dB

NOTES: 2. Maximum junction temperature must be observed.

5.T

= 0°CT

low

6.IL = 0 mA unless otherwise noted.

7.f

= 40 kHz (RT = 4.12 kΩ ± 1%, CT = 0.01 µF ± 1%, RD = 0 Ω)

osc

8.0 V ≤ VCM ≤ +5.2 V.

high

= +125°C

MOTOROLA ANALOG IC DEVICE DATA

3

SG3526

ELECTRICAL CHARACTERISTICS (continued)

Characteristics Symbol Min Typ Max Unit

PWM COMPARATOR SECTION (Note 7)

Minimum Duty Cycle

(V

Compensation

Maximum Duty Cycle

(V

Compensation

DIGITAL PORTS (SYNC, SHUTDOWN, RESET)

Output Voltage

(High Logic Level) (I (Low Logic Level) (I

Input Current  High Logic Level

(High Logic Level) (VIH = +2.4 V) (Low Logic Level) (VIL = +0.4 V)

CURRENT LIMIT COMPARATOR SECTION (Note 9)

Sense Voltage (RS ≤ 50 Ω) V Input Bias Current I

SOFT–START SECTION

Error Clamp Voltage (Reset = +0.4 V) – 0.1 0.4 V C

Soft–Start

OUTPUT DRIVERS (Each Output, VC = +15 Vdc, unless otherwise noted.)

Output High Level

I

= 20 mA

source

I

= 100 mA

source

Output Low Level

I

= 20 mA

sink

I

= 100 mA

sink

Collector Leakage, VC = +40 V I Rise Time (CL = 1000 pF) t Fall Time (CL = 1000 pF) t Supply Current

(Shutdown

NOTES: 7. f

osc

8.0 V ≤ VCM ≤ +5.2 V

9.0 V ≤ VCM ≤ +12 V

= +0.4 V)

= +3.6 V)

= 40 µA)

source

= 3.6 mA)

sink

Charging Current (Reset = +2.4 V) I

= +0.4 V, VCC = +35 V, RT = 4.12 kΩ)

= 40 kHz (RT = 4.12 kΩ ± 1%, CT = 0.01 µF ± 1%, RD = 0 Ω)

DC

min

DC

max

V

OH

V

OL

I

IH

I

IL

sense

IB

CS

V

OH

V

OL

C(leak)

r f

I

CC

– – 0 %

45 49 – %

2.4 –

– –

80 100 120 mA  –3.0 –10 µA

50 100 150 µA

12.5 12

– –

– 50 150 µA – 0.3 0.6 µs – 0.1 0.2 µs – 18 30 mA

4.0

0.2

–125 –225

13.5 13

0.2

1.2

–

0.4

–200 –360

– –

0.3

2.0

V

µA

V

4

MOTOROLA ANALOG IC DEVICE DATA

Figure 1. Reference Stability over T emperature

SG3526

Figure 2. Reference V oltage as a

Function Supply V oltage

5.0

50 mV

Spec Limit

–75 –50 –25 0 25 50 75 100 125 150

TJ, JUNCTION TEMPERATURE (

°

C)

Figure 3. Error Amplifier Open Loop

Frequency Response

80 60 40

, VOLTAGE GAIN (dB)

20

Vol

A

1

+

2

0

_

100 pF C

3

Comp

10 100 1.0 k 10 k 100 k 1.0 M 10 M

f, FREQUENCY (Hz)

4.0

3.0

2.0

, REFERENCE VOLTAGE (V)

ref

V

1.0

1.0 2.0 3.0 4.0 5.0 10 20 30 40 VCC, SUPPLY VOLTAGE (V)

Figure 4. Current Limit Comparator Threshold

8.0

7.0

6.0

5.0

4.0

3.0

2.0

SHUTDOWN VOLTAGE (V)

1.0 0

25 50 75 100 125 150 175 200

DIFFERENTIAL INPUT VOLTAGE (mV)

Figure 5. Undervoltage Lockout Characteristic

8.0

7.0

6.0

5.0

4.0

3.0

RESET VOLTAGE (V)

2.0

1.0 0

0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0

V

, REFERENCE VOLTAGE (V)

ref

MOTOROLA ANALOG IC DEVICE DATA

Figure 6. Output Driver Saturation Voltage as a

Function of Sink Current

2.5

2.0

1.5

1.0

0.5

, OUTPUT DRIVER SA TURATION VOLTAGE (V)

0

sat

2.0 5.0 10 20 50 100 200

V

OUTPUT DRIVER SINK CURRENT (mA)

5

SG3526

Figure 7. VC Saturation V oltage as a

Function of Sink Current

2.5

2.0

1.5

1.0

, SATURATION VOLTAGE (V)

0.5

SAT

V

0

2.0 5.0 10 20 50 100 200 IC, SINK CURRENT (mA)

Figure 9. Error Amplifier Figure 10. Undervoltage Lockout

V

CC

Q6

V

14

ref

Q11

Q12

µ

A

Q10

Q2

Q1

14

125

µ

A

Q3 Q4

µ

50

µ

A

Q7

A

5001.0k

Q5

50µA

100

µ

Q8 Q9

A

1.0k 500

100

µ

A

3 Compensation

100

µ

A

200

100

Ω

50

20

10

, TIMING RESISTOR (k )

T

5.0

R

2.0

Bandgap

Reference

RD = 0

0.002

1.2V

Figure 8. Oscillator Period

Ω

0.01

0.005

V

ref

0.1

0.02

0.05 OSCILLA TOR PERIOD (ms)

R1

R2

0.2

1.0

0.5

+ –

2.0

5.0

10

20

50

100

200

To Reset To Driver A

To Driver B

500

1000

– Error

6

Sync

PWM

+ Error

S

Q

D

Q

Metering

F/F

1

Figure 11. Pulse Processing Logic

Memory

F/F

S

QR

Clock

PWM

The metering Flip–Flop is an asynchronous data latch which suppresses high frequency oscillations by allowing only one PWM pulse per oscillator cycle.

The memory Flip–Flop prevents double pulsing in a push–pull configuration by remembering which output produced the last pulse.

MOTOROLA ANALOG IC DEVICE DATA

SG3526

APPLICATIONS INFORMATION

Figure 12. Extending Reference

Output Current Capability

*

C

V

CC

Gnd

* May be required with some types of transistors

27

17 18

Reference

Regulator

15

+

10µF

V

ref

V

ref

Gnd

V

out

Figure 13. Error Amplifier Connections

R

= V

3

2

ref

1

+

2

–

Positive

R

1

Output Voltage

R1 + R

2

R2 R

R3 =

V

ref

Gnd

R1R

R1 + R

2

Figure 14. Oscillator Connections Figure 15. Foldback Current Limiting

Output Filter

11

R

D

SG3526

910

12

Sync

6

–

8

7

+

Negative Output

R

1

ref

Voltage

1

+

2

–

R

1 2

+

V

out

R

2

R

3

V

= V

out

R

S

R

1

+ Error – Error

Reset

R

2

R

T

C

T

I

=

(max)

0.1 V +

V

out R1

R1 + R2

R

S

Figure 16. Soft–Start Circuity Figure 17. Driving VMOS Power FET s

V

ref

100

µ

1 2

5

Q3

+ –

Error Amp

Undervoltage

Lockout

A

Q1

To

Ramp

Q2

C

Soft–Start

–

PWM

+

+12V

14

V

C

SG3526

Gnd

13

A

16

B

ISC =

0.1 V R

S

–Gnd

MOTOROLA ANALOG IC DEVICE DATA

The totem pole output drivers of the SG3526 are ideally suited for driving the input capacitance of power FET s at high speeds.

7

SG3526

Figure 18. Half–Bridge Configuration

+V

Supply

R1

14

SG3526

15

V

C

Gnd

13

A

16

B

T1

Q1

Q2

+V

Supply

C1

T2

C2

In the above circuit, current limiting is accomplished by using the current limit comparator output to reset the soft–start capacitor.

Current Limiting

R1

14

V

C

A

C1

5

R

8

S

4

C

SG3526

+CS

–CS

S

Gnd

15

B

Figure 20. Single–Ended Configuration Figure 21. Push–Pull Configuration

Figure 19. Flyback Converter with

13

16

7

6

D1

D2

R2

R4

C2

Q1

T1

R3

+V Supply

R1

Q1

R2

14

V

C

SG3526

Gnd

15

To Output Filter

13

A

16

B

+V Supply

R1

14

V

C

SG3526

Gnd

15

C1

13

A

16

B

R2

C2

R3

Q1

Q2

T1

8

MOTOROLA ANALOG IC DEVICE DATA

SG3526

OUTLINE DIMENSIONS

N SUFFIX

PLASTIC PACKAGE

CASE 707–02

ISSUE C

NOTES:

1. POSITIONAL TOLERANCE OF LEADS (D), SHALL BE WITHIN 0.25 (0.010) AT MAXIMUM

18

10

B

1

9

A

C

K

N

F

D

H

G

SEATING PLANE

L

M

J

MATERIAL CONDITION, IN RELATION TO SEATING PLANE AND EACH OTHER.

2. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL.

3. DIMENSION B DOES NOT INCLUDE MOLD FLASH.

DIM MIN MAX MIN MAX

A 22.22 23.24 0.875 0.915 B 6.10 6.60 0.240 0.260 C 3.56 4.57 0.140 0.180 D 0.36 0.56 0.014 0.022 F 1.27 1.78 0.050 0.070 G 2.54 BSC 0.100 BSC H 1.02 1.52 0.040 0.060

J 0.20 0.30 0.008 0.012 K 2.92 3.43 0.115 0.135 L 7.62 BSC 0.300 BSC M 0 15 0 15

__ __

N 0.51 1.02 0.020 0.040

INCHESMILLIMETERS

MOTOROLA ANALOG IC DEVICE DATA

9

SG3526

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty , representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “T ypical” parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.

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10

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MOTOROLA ANALOG IC DEVICE DATA

SG3526/D

*SG3526/D*