Device
Operating
Temperature Range Package
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SEMICONDUCTOR
TECHNICAL DATA
PULSE WIDTH MODULATION
CONTROL CIRCUIT
ORDERING INFORMATION
SG3526N TJ = 0° to +125°C Plastic DIP
PIN CONNECTIONS
Order this document by SG3526/D
N SUFFIX
PLASTIC PACKAGE
CASE 707
18
1
(Top View)
+Error
Compensation
CSoft–Start
–CS
+CS
Shutdown
–Error
Reset
RT
RDeadtime
Sync
Output A
Ground
Output B
VCC
Vref
VC
CT
1
2
3
4
5
6
7
8
12
13
14
15
16
17
18
9
11
10
1MOTOROLA ANALOG IC DEVICE DATA
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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
Vref
VCC
Ground
Sync
RDeadtime
RT
CT
Reset
CSoft–Start
Compensation
+Error
–Error
+C.S.
–C.S.
Shutdown
18
17
15
12
11
9
10
5
4
3
1
2
7
6
8
Reference
Regulator
Soft
Start
VCC
Amp
Under–
Voltage
Lockout
Metering
F/F
Memory
F/F
Toggle
F/F
S
D
Q
Q
S
R Q
T
Q
Q
14
VC
13
Output
A
16
Output
B
To Internal
Circuitry
Oscillator
–
–
–
+
+ +
Motorola, Inc. 1996 Rev 2
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SG3526
2 MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS (Note 1)
Rating Symbol Value Unit
Supply Voltage VCC +40 Vdc
Collector Supply Voltage VC +40 Vdc
Logic Inputs –0.3 to +5.5 V
Analog Inputs –0.3 to VCC V
Output Current, Source or Sink IO ±200 mA
Reference Load Current (VCC = 40 V, Note 2) Iref 50 mA
Logic Sink Current 15 mA
Power Dissipation
TA = +25°C (Note 3)
TC = +25°C (Note 4)
PD
1000
3000
mW
Thermal Resistance Junction–to–Air RθJA 100 °C/W
Thermal Resistance Junction–to–Case RθJC 42 °C/W
Operating Junction Temperature TJ +150 °C
Storage Temperature Range Tstg –65 to +150 °C
Lead Temperature (Soldering, 10 Seconds) TSolder ±300 °C
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.
RECOMMENDED OPERATING CONDITIONS
Characteristics Symbol Min Max Unit
Supply Voltage VCC 8.0 35 Vdc
Collector Supply Voltage VC 4.5 35 Vdc
Output Sink/Source Current (Each Output) IO 0 ±100 mA
Reference Load Current Iref 0 20 mA
Oscillator Frequency Range fosc 0.001 400 kHz
Oscillator Timing Resistor RT 2.0 150 kΩ
Oscillator Timing Capacitor CT 0.001 20 µF
Available Deadtime Range (40 kHz) – 3.0 50 %
Operating Junction Temperature Range TJ 0 +125 °C
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SG3526
3MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (VCC = +15 Vdc, TJ = Tlow to Thigh [Note 5], unless otherwise noted.)
Characteristics Symbol Min Typ Max Unit
REFERENCE SECTION (Note 6)
Reference Output Voltage (TJ = +25°C) Vref 4.90 5.00 5.10 V
Line Regulation (+8.0 V ≤ VCC ≤ +35 V) Regline – 10 30 mV
Load Regulation (0 mA ≤ IL ≤ 20 mA) Regload – 10 50 mV
Temperature Stability ∆Vref/∆T – 10 – mV
Total Reference Output Voltage Variation
(+8.0 V ≤ VCC ≤ +35 V, 0 mA ≤ IL ≤ 20 mA)
∆Vref 4.85 5.00 5.15 V
Short Circuit Current (Vref = 0 V) (Note 2) ISC 25 80 125 mA
UNDERVOLTAGE LOCKOUT
Reset Output Voltage (Vref = +3.8 V) – 0.2 0.4 V
Reset Output Voltage (Vref = +4.8 V) 2.4 4.8 – V
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)
∆fosc
∆ VCC
– 0.5 1.0 %
Frequency Stability over Temperature
(∆TJ = Tlow to Thigh)
∆fosc
∆ TJ
– 2.0 – %
Minimum Frequency
(RT = 150 kΩ, CT = 20 µF)
fmin – 0.5 – Hz
Maximum Frequency
(RT = 2.0 kΩ, CT = 0.001 µF)
fmax 400 – – kHz
Sawtooth Peak Voltage (VCC = +35 V) Vosc(P) – 3.0 3.5 V
Sawtooth Valley Voltage (VCC = +8.0 V) Vosc(V) 0.45 0.8 – V
ERROR AMPLIFIER SECTION (Note 8)
Input Offset Voltage (RS ≤ 2.0 kΩ) VIO – 2.0 10 mV
Input Bias Current IIB – –350 –2000 nA
Input Offset Current IIO – 35 200 nA
DC Open Loop Gain (RL ≥ 10 MΩ) AVOL 60 72 – dB
High Output Voltage
(VPin 1–VPin 2 ≥ +150 mV, Isource = 100 µA)
VOH 3.6 4.2 – V
Low Output Voltage
(VPin 2–VPin 1 ≥ +150 mV, Isink = 100 µA)
VOL – 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. Tlow = 0°C Thigh = +125°C
6. IL = 0 mA unless otherwise noted.
7. fosc = 40 kHz (RT = 4.12 kΩ ± 1%, CT = 0.01 µF ± 1%, RD = 0 Ω)
8. 0 V ≤ VCM ≤ +5.2 V.
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SG3526
4 MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (continued)
Characteristics Symbol Min Typ Max Unit
PWM COMPARATOR SECTION (Note 7)
Minimum Duty Cycle
(VCompensation = +0.4 V)
DCmin – – 0 %
Maximum Duty Cycle
(VCompensation = +3.6 V)
DCmax 45 49 – %
DIGITAL PORTS (SYNC, SHUTDOWN, RESET)
Output Voltage
(High Logic Level) (Isource = 40 µA)
(Low Logic Level) (Isink = 3.6 mA)
VOH
VOL
2.4
–
4.0
0.2
–
0.4
V
Input Current High Logic Level
(High Logic Level) (VIH = +2.4 V)
(Low Logic Level) (VIL = +0.4 V)
IIH
IIL
–
–
–125
–225
–200
–360
µA
CURRENT LIMIT COMPARATOR SECTION (Note 9)
Sense Voltage (RS ≤ 50 Ω) Vsense 80 100 120 mA
Input Bias Current IIB –3.0 –10 µA
SOFT–START SECTION
Error Clamp Voltage (Reset = +0.4 V) – 0.1 0.4 V
CSoft–Start Charging Current (Reset = +2.4 V) ICS 50 100 150 µA
OUTPUT DRIVERS (Each Output, VC = +15 Vdc, unless otherwise noted.)
Output High Level
Isource = 20 mA
Isource = 100 mA
VOH
12.5
12
13.5
13
–
–
V
Output Low Level
Isink = 20 mA
Isink = 100 mA
VOL
–
–
0.2
1.2
0.3
2.0
V
Collector Leakage, VC = +40 V IC(leak) – 50 150 µA
Rise Time (CL = 1000 pF) tr – 0.3 0.6 µs
Fall Time (CL = 1000 pF) tf – 0.1 0.2 µs
Supply Current
(Shutdown = +0.4 V, VCC = +35 V, RT = 4.12 kΩ)
ICC – 18 30 mA
NOTES: 7. fosc = 40 kHz (RT = 4.12 kΩ ± 1%, CT = 0.01 µF ± 1%, RD = 0 Ω)
8. 0 V ≤ VCM ≤ +5.2 V
9. 0 V ≤ VCM ≤ +12 V
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SG3526
5MOTOROLA ANALOG IC DEVICE DATA
Figure 1. Reference Stability over Temperature
Figure 2. Reference Voltage as a
Function Supply Voltage
Figure 3. Error Amplifier Open Loop
Frequency Response Figure 4. Current Limit Comparator Threshold
Figure 5. Undervoltage Lockout Characteristic
Figure 6. Output Driver Saturation Voltage as a
Function of Sink Current
–75 –50 –25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C)
50 mV
Spec
Limit
1.0 2.0 3.0 4.0 5.0 10 20 30 40
VCC, SUPPLY VOLTAGE (V)
,
RE
FE
RE
NC
E
VO
LT
AG
E
(V)
re
f
V
1
2
3
+
_
10 100 1.0 k 10 k 100 k 1.0 M 10 M
100 pF CComp
f, FREQUENCY (Hz)
,
VO
LT
AG
E
GA
IN
(d
B)
Vo
l
A
25 50 75 100 125 150 175 200
DIFFERENTIAL INPUT VOLTAGE (mV)
SH
UT
DO
W
N
V
OL
TA
GE
(V
)
0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Vref, REFERENCE VOLTAGE (V)
RE
SE
T V
OL
TA
GE
(V
)
2.0 5.0 10 20 50 100 200
OUTPUT DRIVER SINK CURRENT (mA)
,
OU
TP
UT
DR
IV
ER
S
AT
UR
AT
IO
N
VO
LT
AG
E
(V)
sa
t
V
5.0
4.0
3.0
2.0
1.0
80
60
40
20
0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
2.5
2.0
1.5
1.0
0.5
0
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SG3526
6 MOTOROLA ANALOG IC DEVICE DATA
R T
Ω
,
TI
MI
NG
R
ES
IS
TO
R
(k
)
Figure 7. VC Saturation Voltage as a
Function of Sink Current Figure 8. Oscillator Period
Figure 9. Error Amplifier Figure 10. Undervoltage Lockout
Figure 11. Pulse Processing Logic
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.
2.0 5.0 10 20 50 100 200
IC, SINK CURRENT (mA)
,
SA
TU
RA
TI
ON
V
OL
TA
GE
(V
)
SA
T
V
0.0
02
0.0
05 0.0
1
0.0
2
0.0
5 0.1 0.2 0.5 1.
0
2.0 5.0 1
0 20 50 10
0
20
0
50
0
10
00
OSCILLATOR PERIOD (ms)
RD = 0 Ω
VCC
Q6
Q5
Vref
125
µA
Q3 Q4
50µA
Q8 Q9
5001.0k
Q2
1
+ Error– Error
Q10
3 Compensation
Q12
Q11
Q7
50µA
14µA
Q1
1.0k 500
100
µA
14µA
100µA
100µA
Vref
R1
1.2V
Bandgap
Reference
R2
+
–
To Reset
To Driver A
To Driver B
Metering
F/F
S
D
Q
Q
QR
S
Clock
PWM
PWM
Sync
Memory
F/F
2.5
2.0
1.5
1.0
0.5
0
200
100
50
20
10
5.0
2.0
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SG3526
7MOTOROLA ANALOG IC DEVICE DATA
Figure 12. Extending Reference
Output Current Capability Figure 13. Error Amplifier Connections
Figure 14. Oscillator Connections Figure 15. Foldback Current Limiting
Figure 16. Soft–Start Circuity Figure 17. Driving VMOS Power FETs
The totem pole output drivers of the SG3526 are ideally
suited for driving the input capacitance of power FETs at
high speeds.
Reference
Regulator
17 18
C*
27
VCC
Gnd
Vref
+
10µF
* May be required with some types of transistors
15
Gnd
Vref
R3
R2
1
2
R1 Positive
Output
Voltage Gnd
Vref
R2
R3
R1
1
2
Vout = Vref
R1
+
–
+
–
Negative
Output
Voltage
Vout = Vref
R1 + R2
R3 =
R1R2
11
RD 9 10
12SG3526
RT CT
Sync
+
–Gnd
8
6
7
–
R1
R2
RS
Output Filter
Vout
I(max) = RS
0.1 V +
Vout R1
+
ISC =
0.1 V
RS
+
Error
Amp
–
–
+
PWM
Ramp
Vref
100
µA
Q2
Q1
To
Undervoltage
Lockout CSoft–Start
Q3
1
2
5
+ Error
– Error
Reset
+12V
14
13
16
VC A
B
Gnd
SG3526
APPLICATIONS INFORMATION
R1 + R2
R2 R2
R1 + R2
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SG3526
8 MOTOROLA ANALOG IC DEVICE DATA
Figure 18. Half–Bridge Configuration
Figure 19. Flyback Converter with
Current Limiting
Figure 20. Single–Ended Configuration Figure 21. Push–Pull Configuration
+V
Supply
VC A
B
SG3526
Gnd
15
14
R1
13
16 Q2
Q1
T2
C2
T1
C1
In the above circuit, current limiting is accomplished by using the
current limit comparator output to reset the soft–start capacitor.
+V
Supply
R1
C1 15 R2
R3
13
16
7
6
5
8
4
D1
D2
14
C2
R4
T1
Q1
VC A
B
+CS
–CSGndCS
S
R
SG3526
To
Output
Filter
Q1
R1
R2
14
13
16
VC
A
B
SG3526
Gnd
15
+V Supply +V Supply
R1
14
15
VC A
B
SG3526
Gnd
13
16
C1
R2
C2
R3
Q1 T1
Q2
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SG3526
9MOTOROLA ANALOG IC DEVICE DATA
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
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.
1
SEATING
PLANE
10
9
18
M
A
B
K
C
N
F
G
D
H
J
L
DIM MIN MAX MIN MAX
INCHESMILLIMETERS
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
� � � �
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SG3526
10 MOTOROLA ANALOG IC DEVICE DATA
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. “Typical” 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: RMFAX0@email.sps.mot.com – TOUCHTONE 602–244–6609 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,
INTERNET: http://Design–NET.com 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298
SG3526/D
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◊
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