SG3525AP STMicroelectronics, SG3525AP Datasheet

IC PWM REGULATING 16-SOIC

SG3525AP

Manufacturer Part Number
SG3525AP
Description
IC PWM REGULATING 16-SOIC
Manufacturer
STMicroelectronics
Type
Pulse Width Modulator Controllerr
Datasheets

Specifications of SG3525AP

Pwm Type
Voltage Mode
Number Of Outputs
2
Frequency - Max
500kHz
Duty Cycle
49%
Voltage - Supply
8 V ~ 35 V
Buck
No
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
0°C ~ 70°C
Package / Case
16-SOIC (3.9mm Width)
Frequency-max
500kHz
Topology
Push-Pull
Output Current
500 mA
Switching Frequency
400 KHz
Duty Cycle (max)
49 %
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Fall Time
50 ns
Mounting Style
SMD/SMT
Rise Time
100 ns
Synchronous Pin
Yes
Common Mode Rejection Ratio
75
Current, Input Bias
1 μA
Current, Input Offset
1 μA
Current, Output
0 to 100 mA (Steady State), 0 to 400 mA (Peak)
Current, Supply
14 mA
Frequency, Oscillator
400 kHz
Package Type
SO-16
Power Dissipation
1000 mW
Regulation, Line
10 mV
Regulation, Load
20 mV
Temperature, Operating, Range
0 to +70 °C
Time, Fall
50 ns
Time, Rise
100 ns
Transconductance
1.5
Voltage, Gain
75 dB
Voltage, Input
35 V
Voltage, Noise
40 μV
Voltage, Offset
2 mV
Voltage, Output
5.1 V
Voltage, Supply
4.5 to 35 V
Voltage, Supply, Rejection Ratio
60 dB
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-2993-5

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DESCRIPTION
The SG3525A series of pulse width modulator inte-
grated circuits are designed to offer improved per-
formance and lowered external parts count when
used in designing all types of switching power sup-
plies. The on-chip + 5.1 V reference is trimmed to
1 % and the input common-mode range of the error
amplifier includes the reference voltage eliminating
external resistors. A sync input to the oscillator al-
lows multiple units to be slaved or a single unit to be
synchronized to an external system clock. A single
resistor between the C
provide a wide range of dead time ad-
These devices also feature built-in soft-start circuitry
with only an external timing capacitor required. A
shutdown terminal controls both the soft-start circu-
ity and the output stages, providing instantaneous
PIN CONNECTIONS AND ORDERING NUMBERS (top view)
8 TO 35 V OPERATION
5.1 V REFERENCE TRIMMED TO
100 Hz TO 500 KHz OSCILLATOR RANGE
SEPARATE OSCILLATOR SYNC TERMINAL
ADJUSTABLE DEADTIME CONTROL
INTERNAL SOFT-START
PULSE-BY-PULSE SHUTDOWN
INPUT UNDERVOLTAGE LOCKOUT WITH
HYSTERESIS
LATCHING PWM TO PREVENT MULTIPLE
PULSES
DUAL SOURCE/SINK OUTPUT DRIVERS
®
T
and the discharge terminals
REGULATING PULSE WIDTH MODULATORS
1 %
justment.
SG2525A
SG3525A
turn off through the PWM latch with pulsed shut-
down, as well as soft-start recycle with longer shut-
down commands. These functions are also control-
led by an undervoltage lockout which keeps the out-
puts off and the soft-start capacitor discharged for
sub-normal input voltages. This lockout circuitry in-
cludes approximately 500 mV of hysteresis for jitter-
free operation. Another feature of these PWM cir-
cuits is a latch following the comparator. Once a
PWM pulses has been terminated for any reason,
the outputs will remain off for the duration of the pe-
riod. The latch is reset with each clock pulse. The
output stages are totem-pole designs capable of
sourcing or sinking in excess of 200 mA. The
SG3525A output stage features NOR logic, giving a
LOW output for an OFF state.
Type
DIP16
Plastic DIP
SG2525AN
SG3525AN
SG2525A
SG3525A
16(Narrow)
SG2525AP
SG3525AP
SO16
1/12

Related parts for SG3525AP

SG3525AP Summary of contents

Page 1

... The latch is reset with each clock pulse. The output stages are totem-pole designs capable of sourcing or sinking in excess of 200 mA. The SG3525A output stage features NOR logic, giving a LOW output for an OFF state. Type Plastic DIP SG2525A SG2525AN SG3525A SG3525AN SG2525A SG3525A 16(Narrow) SO16 SG2525AP SG3525AP 1/12 ...

Page 2

SG2525A-SG3525A ABSOLUTE MAXIMUM RATINGS Symbol V Supply Voltage i V Collector Supply Voltage C I Oscillator Charging Current OSC I Output Current, Source or Sink o I Reference Output Current R I Current through Logic Inputs Analog ...

Page 3

ELECTRICAL CHARACTERISTICS ( and over operating temperature, unless otherwise specified) Symbol Parameter REFERENCE SECTION V Output Voltage REF V Line Regulation REF V Load Regulation REF Temp. Stability REF * Total Output Variation ...

Page 4

SG2525A-SG3525A ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter PWM COMPARATOR Minimum Duty-cycle Maximum Duty-cycle Input Threshold * Input Bias Current SHUTDOWN SECTION Soft Start Current Soft Start Low Level Shutdown Threshold Shutdown Input Current V * Shutdown Delay OUTPUT DRIVERS (each output) ...

Page 5

SG2525A-SG3525A RECOMMENDED OPERATING CONDITIONS ( ) Input Voltage ( Collector Supply Voltage ( Sink/Source Load Current (steady state) Sink/Source Load Current (peak) Reference Load Current Oscillator Frequency Range Oscillator Timing Resistor Oscillator Timing Capacitor Dead Time ...

Page 6

SG2525A-SG3525A mm DIM. MIN. TYP. MAX. MIN. a1 0.51 0.020 B 0.77 1.65 0.030 b 0 8.5 e 2.54 e3 17.78 F 7.1 I 5.1 L 3.3 Z 1.27 10/12 inch MECHANICAL DATA TYP. MAX. ...

Page 7

DIM. MIN. TYP. MAX. MIN. A 1.75 a1 0.1 0.25 0.004 a2 1.6 b 0.35 0.46 0.014 b1 0.19 0.25 0.007 C 0.5 c1 45˚ (typ.) D (1) 9.8 10 0.386 E 5.8 6.2 0.228 e 1.27 e3 8.89 ...

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