SG3525AP STMicroelectronics, SG3525AP Datasheet - Page 7

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

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

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.
SG2525A-SG3525A
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