E-SG3525AP STMicroelectronics, E-SG3525AP Datasheet - Page 7
![IC PWM REGULATING 16-SOIC](/photos/1/39/13919/497-16-soic_series_sml.jpg)
E-SG3525AP
Manufacturer Part Number
E-SG3525AP
Description
IC PWM REGULATING 16-SOIC
Manufacturer
STMicroelectronics
Datasheet
1.SG3525AN.pdf
(12 pages)
Specifications of E-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
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-4597-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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 sink a maximum of 100 A 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 cir-
cuitry of Pin 10 which has been improved to en-
hance the available shutdown options. Activating
this circuit by applying a positive signal on Pin 10
performs two functions : the PWM latch is immedi-
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-
down command is short, the PWM signal is termi-
nated 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, re-
cycling slow turn-on upon release.
Pin 10 should not be left floating as noise pickup
could conceivably interrupt normal operation.
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