SG2525AP STMicroelectronics, SG2525AP Datasheet

IC PWM REGULATING 16-SOIC

SG2525AP

Manufacturer Part Number
SG2525AP
Description
IC PWM REGULATING 16-SOIC
Manufacturer
STMicroelectronics
Datasheet

Specifications of SG2525AP

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
-25°C ~ 85°C
Package / Case
16-SOIC (3.9mm Width)
Frequency-max
500kHz
Output Voltage
5.15 V
Input Voltage
8 V to 35 V
Switching Frequency
500 KHz
Operating Temperature Range
- 25 C to + 85 C
Mounting Style
SMD/SMT
Duty Cycle (max)
49 %
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-6726-5
SG2525AP

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
SG2525AP-2LF
Manufacturer:
ST
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STM
Quantity:
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Manufacturer:
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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)
June 2000
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

SG2525AP 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

TEST CIRCUIT SG2525A-SG3525A 5/12 ...

Page 6

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 7

Figure 5 : Error Amplifier. PRINCIPLES OF OPERATION SHUTDOWN OPTIONS (see Block Diagram) Since both the compensation and soft-start termi- nals (Pins 9 and 8) have current source pull-ups, either can readily accept a pull-down signal which only has to ...

Page 8

SG2525A-SG3525A Figure 6 : Oscillator Schematic. Figure 7 : Output Circuit (1/2 circuit shown). 8/12 ...

Page 9

Figure 8. For single-ended supplies, the driver outputs are grounded. The V terminal is switched to ground by C the totem-pole source transistors on alternate oscil- lator cycles. Figure 10. The low source impedance of the output drivers pro- vides ...

Page 10

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 11

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 ...

Page 12

... No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMi- croelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics ...

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