SG2525 STMicroelectronics, SG2525 Datasheet

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SG2525

Manufacturer Part Number
SG2525
Description
Voltage Mode PWM
Manufacturer
STMicroelectronics
Datasheet

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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

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SG2525 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

... T Logic Inputs Analog Inputs P Total Power Dissipation at T tot T Junction Temperature Range j T Storage Temperature Range stg T Operating Ambient Temperature : SG2525A op THERMAL DATA Symbol R Thermal Resistance Junction-pins th j-pins R Thermal Resistance Junction-ambient th j-amb R Thermal Resistance Junction-alumina (*) th j-alumina * Thermal resistance junction-alumina with the device soldered on the middle of an alumina supporting substrate measuring 0.65 mm thickness with infinite heatsink ...

Page 3

... C 0.3 j 1.2 Sync Voltage = 1 SG2525A-SG3525A SG2525A SG3525A Typ. Max. Min. Typ. Max. 5.1 5.15 5 5.1 5 5.2 4.95 5.25 80 100 80 100 40 200 40 200 20 ...

Page 4

... nF nF 10nF Approximate oscillator frequency is defined according to the following equation : G v specification is used to calculate minimum G SG2525A SG3525A Typ. Max. Min. Typ. Max 0.9 0.7 0.9 3.3 3.6 3.3 3.6 0. ...

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 Resistor Range ( ) Range over which the device is functional and parameter limits are guaranteed. ...

Page 7

... Activating this circuit by applying a positive signal on Pin 10 performs two functions : the PWM latch is immedi- SG2525A-SG3525A ately set providing the fastest turn-off signal to the outputs ; and a 150 A current sink begins to dis- charge the external soft-start capacitor. If the shut- ...

Page 8

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

Page 9

... Figure 10. The low source impedance of the output drivers pro- vides rapid charging of Power Mos input capaci- tance while minimizing external components. SG2525A-SG3525A Figure 9. In conventional push-pull bipolar designs, forward base drive is controlled times for the power devices are achieved with ...

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. 0.065 0.020 0.010 0.787 0.335 0.100 0.700 0.280 0.201 0.130 0.050 OUTLINE AND DIP16 ...

Page 11

... S (1) D and F do not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch). inch TYP. MAX. MECHANICAL DATA 0.069 0.009 0.063 0.018 0.010 0.020 0.394 0.244 0.050 0.350 0.157 0.209 0.050 0.024 SG2525A-SG3525A OUTLINE AND SO16 Narrow 11/12 ...

Page 12

... SG2525A-SG3525A Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the conse- quences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. 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 ...

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