Motorola SG3526N Datasheet

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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

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

ref

line

load

/∆T – 10 – mV

ref

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

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