Datasheet SG3527AN, SG3525ADW, SG3525AN Datasheet (Motorola)

 
  

Order this document by SG3525A/D




The SG3525A, SG3527A pulse width modulator control circuits offer
improved performance and lower external parts count when implemented for
controlling all types of switching power supplies. The on–chip +5.1 V
reference is trimmed to ±1% and the error amplifier has an input
common–mode voltage range that includes the reference voltage, thus
eliminating the need for external divider resistors. A sync input to the
oscillator enables multiple units to be slaved or a single unit to be
synchronized to an external system clock. A wide range of deadtime can be
programmed by a single resistor connected between the CT and Discharge
pins. These devices also feature built–in soft–start circuitry , requiring only an
external timing capacitor. A shutdown pin controls both the soft–start circuitry
and the output stages, providing instantaneous turn off through the PWM
latch with pulsed shutdown, as well as soft–start recycle with longer
shutdown commands. The under voltage lockout inhibits the outputs and the
changing of the soft–start capacitor when VCC is below nominal. The output
stages are totem–pole design capable of sinking and sourcing in excess of
200 mA. The output stage of the SG3525A features NOR logic resulting in a
low output for an off–state while the SG3527A utilized OR logic which gives a
high output when off.

• 8.0 V to 35 V Operation

• 5.1 V ± 1.0% Trimmed Reference

• 100 Hz to 400 kHz Oscillator Range

• Separate Oscillator Sync Pin

• Adjustable Deadtime Control

• Input Undervoltage Lockout

• Latching PWM to Prevent Multiple Pulses

• Pulse–by–Pulse Shutdown

• Dual Source/Sink Outputs: ±400 mA Peak

Representative Block Diagram

V

ref

V

CC

Ground

OSC Output

Sync

RT
CT

Discharge

Compensation

INV. Input

Noninv. Input

C

Soft–Start

Shutdown

16
15
12

Reference
Regulator

4
3

6

Oscillator

5
7

9
1

–

Error

2

Amp

+

8

5.0k

10

T o Internal

Circuitry

+
– PWM
–

50

µ

5.0k

Under–
Voltage
Lockout

Q

F/F

Q

R

S

Latch

V

S

REF

A

VC
13

Output A

NOR

NOR

SG3525A Output Stage

OR

OR

11

14

Output B

13

VC

Output A

11

Output B

14

SG3527A
Output Stage

PULSE WIDTH MODULATOR

CONTROL CIRCUITS

SEMICONDUCTOR

TECHNICAL DATA

N SUFFIX

16

1

16

1

Inv. Input

Noninv. Input

OSC. Output

Discharge
Soft–Start

ORDERING INFORMATION

Device

SG3525AN
SG3525ADW
SG3527AN

PIN CONNECTIONS

1
2

Sync

3
4

C

5

T

R

6

T

7
89

Temperature Range

TA = 0° to +70°C

PLASTIC PACKAGE

DW SUFFIX

PLASTIC PACKAGE

CASE 751B

(Top View)

Operating

CASE 648

(SO–16L)

V

16

ref

V

15

CC

Output B

14

V

13

C

Ground

12

Output A

11

Shutdown

10

Compensation

Package

Plastic DIP

SO–16L

Plastic DIP

MOTOROLA ANALOG IC DEVICE DATA

 Motorola, Inc. 1996 Rev 2

1

SG3525A SG3527A

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 Output Current I
Oscillator Charging Current 5.0 mA
Power Dissipation (Plastic & Ceramic Package)

TA = +25°C (Note 2)

TC = +25°C (Note 3)
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.Derate at 10 mW/°C for ambient temperatures above +50°C.

3.Derate at 16 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

±500 mA

50 mA

1000
2000

100 °C/W

60 °C/W

+150 °C

–55 to +125 °C

+300 °C

V

mW

RECOMMENDED OPERATING CONDITIONS

Characteristics Symbol Min Max Unit

Supply Voltage V
Collector Supply Voltage V
Output Sink/Source Current

(Steady State)

(Peak)
Reference Load Current I
Oscillator Frequency Range f
Oscillator Timing Resistor R
Oscillator Timing Capacitor C
Deadtime Resistor Range R
Operating Ambient Temperature Range T

APPLICATION INFORMATION

Shutdown Options (See Block diagram, front page)

Since both the compensation and soft–start terminals
(Pins 9 and 8) have current source pull–ups, either can
readily accept a pull–down signal which only has to sink a
maximum of 100 µA to turn off the outputs. This is subject to
the added requirement of discharging whatever external
capacitance may be attached to these pins.

An alternate approach is the use of the shutdown circuitry
of Pin 10 which has been improved to enhance the available
shutdown options. Activating this circuit by applying a
positive signal on Pin 10 performs two functions: the PWM

latch is immediately set providing the fastest turn–off signal to
the outputs; and a 150 µA current sink begins to discharge
the external soft–start capacitor. If the shutdown command is
short, the PWM signal is terminated without significant
discharge of the soft–start capacitor, thus, allowing, for
example, a convenient implementation of pulse–by–pulse
current limiting. Holding Pin 10 high for a longer duration,
however, will ultimately discharge this external capacitor,
recycling slow turn–on upon release.

Pin 10 should not be left floating as noise pickup could

conceivably interrupt normal operation.

CC

I

O

ref

osc

8.0 35 Vdc

C

T

T
D
A

4.5 35 Vdc

0
0

0 20 mA

0.1 400 kHz

2.0 150 kΩ

0.001 0.2 µF
0 500 Ω
0 +70 °C

±100
±400

mA

2

MOTOROLA ANALOG IC DEVICE DATA

SG3525A SG3527A

ELECTRICAL CHARACTERISTICS (V

Characteristics

= +20 Vdc, TA = T

CC

low

to T

[Note 4], unless otherwise noted.)

high

Symbol Min Typ Max Unit

REFERENCE SECTION

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 Output Variation

∆V

Includes Line and Load Regulation over Temperature

Short Circuit Current

(V

= 0 V, TJ = +25°C)

ref

Output Noise Voltage (10 Hz ≤ f ≤ 10 kHz, TJ = +25°C) V

ref

line

load

/∆T – 20 – mV

ref

ref

I

SC

n

5.00 5.10 5.20 Vdc
– 10 20 mV
– 20 50 mV

4.95 – 5.25 Vdc

– 80 100 mA

– 40 200 µV

Long Term Stability (TJ = +125°C) (Note 5) S – 20 50 mV/khr

OSCILLATOR SECTION (Note 6, unless otherwise noted.)

Initial Accuracy (TJ = +25°C) – ±2.0 ±6.0 %
Frequency Stability with Voltage

(+8.0 V ≤ VCC ≤ +35 V)

Frequency Stability with Temperature

Minimum Frequency (RT = 150 kΩ, CT = 0.2 µF) f
Maximum Frequency (RT = 2.0 kΩ, CT = 1.0 nF) f

∆f

D

∆f

osc
VCC

osc

D

min

max

– ±1.0 ±2.0 %

– ±0.3 – %

T

– 50 – Hz

400 – – kHz
Current Mirror (IRT = 2.0 mA) 1.7 2.0 2.2 mA
Clock Amplitude 3.0 3.5 – V
Clock Width (TJ = +25°C) 0.3 0.5 1.0 µs
Sync Threshold 1.2 2.0 2.8 V
Sync Input Current (Sync Voltage = +3.5 V) – 1.0 2.5 mA

ERROR AMPLIFIER SECTION (VCM = +5.1 V)

Input Offset Voltage V
Input Bias Current I
Input Offset Current I
DC Open Loop Gain (RL ≥ 10 MΩ) A
Low Level Output Voltage V
High Level Output Voltage V

IO
IB
IO

VOL

OL
OH

– 2.0 10 mV
– 1.0 10 µA
– – 1.0 µA

60 75 – dB

– 0.2 0.5 V

3.8 5.6 – V
Common Mode Rejection Ratio (+1.5 V ≤ VCM ≤ +5.2 V) CMRR 60 75 – dB
Power Supply Rejection Ratio (+8.0 V ≤ VCC ≤ +35 V) PSRR 50 60 – dB

PWM COMPARATOR SECTION

Minimum Duty Cycle DC
Maximum Duty Cycle DC
Input Threshold, Zero Duty Cycle (Note 6) V
Input Threshold, Maximum Duty Cycle (Note 6) V
Input Bias Current I

NOTES: 4.T

= 0° for SG3525A, 3527A T

low

5.Since long term stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability
from lot to lot.

6.Tested at f

= 40 kHz (RT = 3.6 kΩ, CT = 0.01 µF, RD = 0Ω).

osc

= +70°C for SG3525A, 3527A

high

min

max

th
th

IB

– – 0 %

45 49 – %

0.6 0.9 – V
– 3.3 3.6 V
– 0.05 1.0 µA

rms

MOTOROLA ANALOG IC DEVICE DATA

3

SG3525A SG3527A

ELECTRICAL CHARACTERISTICS (Continued)

Characteristics Symbol Min Typ Max Unit

SOFT–START SECTION

Soft–Start Current (V
Soft–Start Voltage (V
Shutdown Input Current (V

OUTPUT DRIVERS (Each Output, VCC = +20 V)

Output Low Level

(I

= 20 mA)

sink

(I

= 100 mA)

sink

Output High Level

(I

= 20 mA)

source

(I

= 100 mA)

source

Under Voltage Lockout (V8 and V9 = High) V
Collector Leakage, VC = +35 V (Note 7) I
Rise Time (CL = 1.0 nF, TJ = 25°C) t
Fall Time (CL = 1.0 nF, TJ = 25°C) t
Shutdown Delay (VDS = +3.0 V, CS = 0, TJ = +25°C) t
Supply Current (VCC = +35 V) I

NOTE: 7.Applies to SG3525A only , due to polarity of output pulses.

shutdown
shutdown

= 0 V) 25 50 80 µA
= 2.0 V) – 0.4 0.6 V

shutdown

= 2.5 V) – 0.4 1.0 mA

V

OL

V

OH

UL

C(leak)

r
f

ds

CC

–
–

18
17

6.0 7.0 8.0 V
– – 200 µA
– 100 600 ns
– 50 300 ns
– 0.2 0.5 µs
– 14 20 mA

0.2

1.0

19
18

0.4

2.0

–
–

V

V

PWM

ADJ.

V/I Meter

V

3.0k

1.0k

1.5k

ref

–

+

0.009

0.1

Clock

Sync

1 = V

IO

2 = 1(+)
3 = 1(–)

1

2

3

1

2

3

RT

Ramp

2

Deadtime

0.001

10k

1

2

3

1

3

100

Ω

0.01

0.1

Comp

16

Lab T est Fixture

Reference Regulator

4

3

6

7
5

9

1
2

O

s
c

i
l

l
a
t
o
r

–

E/A

+

DUT

Flip/

Flop

PWM

50

5.0k

A

B

µ

A

5.0k

15

13

11

1.0k, 1.0W

14

12

8

10

(2)

0.1

+

0.1

Out A

Out B

5.0

2.0k

V

CC

V

C

Gnd

Softstart

µ

F

Shutdown

V

ref

4

MOTOROLA ANALOG IC DEVICE DATA

SG3525A SG3527A

Figure 1. Oscillator Charge Time versus R

200

100

Ω

50

20

10

, TIMING RESISTOR (k )

5.0

T

R

6

R

2.0

2.0 5.0 10 20 50 100 200 500 1000 2000 5000 10,000
CHARGE TIME (

µ

s)

Figure 3. Error Amplifier Open Loop

Frequency Response

1

–
+

2

100

80
60

40

, VOLTAGE GAIN (dB)

20

VOL

A

0

–20

1.0 10 100 1.0 k 10 k 100 k 1.0 M 10 M
f, FREQUENCY (Hz)

RZ = 20 k

T

* RD = 0

Ω

57

R

*

D

T

C

T

9

C

P

R

Z

Figure 2. Oscillator Discharge Time versus R

500

Ω

400

300

200

, DEAD TIME RESISTOR ( )

D

100

R

0

0.2 0.5 1.0 2.0 5.0 10 20 50 100 200
DISCHARGE TIME (

µ

s)

Figure 4. Output Saturation

Characteristics (SG3525A)

VCC = +20 V

°

C

TJ = +25

Source Sat, (VC–VOH)

Sink Sat, (VOL)

0

0.01 0.02 0.03 0.05 0.07 0.1 0.2 0.3 0.5 0.7 1.0

IO, OUTPUT SOURCE OR SINK CURRENT (A)

, SATURATION VOLTAGE (V)

sat

V

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

D

Figure 5. Oscillator Schematic (SG3525A)

V

ref

16

R

T

6

C

T

5

3

Sync

7

Discharge

Q2

12

Q1

Q4

1.0k

Q3

5.0pF

Q7

Q5 Q8

Q6 Q9

2.0k

400

µ

A

23k

2.0k 14k

Q10

1.0k

7.4k

Q11

Q12

Gnd

MOTOROLA ANALOG IC DEVICE DATA

25k

Q14

Q13

3.0k

Ramp
To PWM

Blanking
To Output

250
4

OSC Output

Figure 6. Error Amplifier Schematic (SG3525A)

15

V

CC

Q3

100

Q4

µ

A

5.8V

930Compensation

Inverting

Input

1

Noninverting

Input

2

200µA

Q1 Q2

To PWM
Comparator

5

SG3525A SG3527A

Figure 7. SG3525A Output Circuit

(1/2 Circuit Shown)

V

CC

Q7

Q9

5.0k

Q8

Q6

2.0k

Q4

Q5

V

ref

Q10

Q11

13

Output

V

C

11, 14

Q1 Q2

5.0k 10k 10k

Clock F/F PWM

Q3

Q6 Omitted
in SG3527A

Figure 8. Single–Ended Supply Figure 9. Push–Pull Configuration

Q1

V

C

Gnd

R2

13

12

To Output Filter

11

A

14

B

+Vsupply

R1

SG3525A

For single–ended supplies, the driver outputs are grounded.
The VC terminal is switched to ground by the totem–pole
source transistors on alternate oscillator cycles.

+V

supply

R1

11

14

C1

R2

C2

R3

Q1

Q2

13

V

C

A

SG3525A

B

Gnd

12

In conventional push–pull bipolar designs, forward base drive is
controlled by R1–R3. Rapid turn–off times for the power
devices are achieved with speed–up capacitors C1 and C2.

T1

Figure 10. Driving Power FETS

+Vsupply

The low source impedance of the output drivers provides
rapid charging of power FET input capacitance while
minimizing external components.

R1

13

V

C

SG3525A

Gnd

12

Q1

11

A

Q2

14

B

6

T1

Figure 11. Driving Transformers in a

Half–Bridge Configuration

+V

supply

T1

13

11

V

A

C

SG3525A

Low power transformers can be driven directly by the SG3525A.
Automatic reset occurs during deadtime, when both ends of the
primary winding are switched to ground.

Gnd

12

14

B

Q1

Q2

R1

R2

C1

T2

C2

MOTOROLA ANALOG IC DEVICE DATA

–T–

SG3525A SG3527A

OUTLINE DIMENSIONS

N SUFFIX

PLASTIC PACKAGE

CASE 648–08

–A–

916

B

18

F

C

S

–T–

H

G

D

16 PL

0.25 (0.010) T

K

M

A

–A–

16 9

–B–

18

8 PLP

G

K

C

SEATING

PLANE

D

16 PL

0.25 (0.010) A

M

S

B

T

S

ISSUE R

SEATING
PLANE

M

DW SUFFIX

PLASTIC PACKAGE

CASE 751B–05

(SO–16L)

ISSUE J

0.25 (0.010) B

M

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.

2. CONTROLLING DIMENSION: INCH.

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

4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.

5. ROUNDED CORNERS OPTIONAL.

DIM MIN MAX MIN MAX

L

J

M

S

R

X 45

M

_

F

J

A 0.740 0.770 18.80 19.55
B 0.250 0.270 6.35 6.85
C 0.145 0.175 3.69 4.44
D 0.015 0.021 0.39 0.53
F 0.040 0.70 1.02 1.77
G 0.100 BSC 2.54 BSC
H 0.050 BSC 1.27 BSC
J 0.008 0.015 0.21 0.38
K 0.110 0.130 2.80 3.30
L 0.295 0.305 7.50 7.74
M 0 10 0 10
S 0.020 0.040 0.51 1.01

NOTES:

1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.

5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.

DIM MIN MAX MIN MAX

A 9.80 10.00 0.386 0.393
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.054 0.068
D 0.35 0.49 0.014 0.019
F 0.40 1.25 0.016 0.049
G 1.27 BSC 0.050 BSC
J 0.19 0.25 0.008 0.009
K 0.10 0.25 0.004 0.009
M 0 7 0 7
P 5.80 6.20 0.229 0.244
R 0.25 0.50 0.010 0.019

MILLIMETERSINCHES

____

INCHESMILLIMETERS

____

MOTOROLA ANALOG IC DEVICE DATA

7

SG3525A SG3527A

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.

How to reach us:
USA/EUROPE /Locations Not Listed: Motorola Literature Distribution; JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center,

P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 or 602–303–5454 3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–81–3521–8315

MFAX: RMF [e-mail] – TOUCHT ONE 602–244–6609 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,
INTERNET: http://Design–NET .com 51 Ting Ko k Road, Tai Po, N.T., Hong Kong. 852–26629298

8

◊

MOTOROLA ANALOG IC DEVICE DATA

SG3525A/D

*SG3525A/D*