IC PWM Controller SG3525
SG3525 is a voltage-mode PWM controller IC used in most of the inverters on the market. Many inverter manufacturing companies use SG3525 in the DC to DC converter part of the inverter. It is a 16-pin integrated circuit and has two PWM outputs, both of which are an inversion of each other. Another advantage of SG3525 is that it has a built-in totem pole base PWM driver. The output pins can drive semiconductor devices up to a current range of 50mA.
Package Includes
- 1 x SG3525 IC
Features
- Operates with a supply voltage of 8 to 35 volts (may be damaged above 40V).
- External oscillator synchronization pin available.
- Pulse-to-pulse shutdown capability.
- Frequency range: 100 to 400KHz.
- Versatile dead-time control between switching signals for MOSFETs, IGBTs, and power transistors.
- Maximum power dissipation: ~1000mW.
- Other similar ICs: SG2525, UC3525.
Specifications
- Operating voltage: 8V to 35V
- Error amp reference voltage internally regulated: 5.1V
- Oscillator frequency variable via external resistor: 100Hz to 500kHz
- Separate oscillator sync pinout
- Variable dead-time control
- Internal soft-start feature
- Pulse-by-pulse shutdown capability
- Input under-voltage shutdown feature
- PWM pulses controlled through latching for multiple pulse inhibition
- Dual totem pole driver configuration supported
Pinout of the SG3525 PWM Controller IC
| Pin Number | Description |
|---|---|
| 1 | Inverting pin: If voltage > non-inverting pin, duty cycle increases. |
| 2 | Non-inverting pin: If voltage > inverting pin, duty cycle decreases. |
| 3 | Synchronization pin: Used for synchronization of two waves. |
| 4 | Oscillator output: Provides the output of an oscillator. |
| 5 | Frequency set pin: Used with pin 6 and 7 to set the PWM frequency. |
| 6 | Frequency set pin: Used with pin 5 and 7 to set the PWM frequency. |
| 7 | Frequency set pin: Used with pin 5 and 6 to set the PWM frequency. |
| 8 | Soft start pin (SS): Enables output after a delay. Higher capacitance increases delay. |
| 9 | Compensation pin: Used with feedback to stabilize output voltage against rapid changes. |
| 10 | Shutdown pin: 0 = active, 1 (5V) = shutdown mode. |
| 11 | Output pin: Provides input to MOSFETs, built-in MOSFET driver. |
| 12 | Ground |
| 13 | Vc (Power pin): Should be between 5-35V. |
| 14 | Output pin: Provides input to MOSFETs, built-in MOSFET driver. |
| 15 | Vin (Power pin): Should be between 8-35V. |
| 16 | Reference pin: Used to set reference voltage or provide 5V to the shutdown pin. |
Applications
- Used in power electronics applications like pure sine wave inverters.
- Generates regulated voltage for DC-DC converters (buck, boost, cuk, etc.).
Features
- Operates with a supply voltage of 8 to 35 volts (may be damaged above 40V).
- External oscillator synchronization pin available.
- Pulse-to-pulse shutdown capability.
- Frequency range: 100 to 400KHz.
- Versatile dead-time control between switching signals for MOSFETs, IGBTs, and power transistors.
- Maximum power dissipation: ~1000mW.
- Other similar ICs: SG2525, UC3525.
Specifications
- Operating voltage: 8V to 35V
- Error amp reference voltage internally regulated: 5.1V
- Oscillator frequency variable via external resistor: 100Hz to 500kHz
- Separate oscillator sync pinout
- Variable dead-time control
- Internal soft-start feature
- Pulse-by-pulse shutdown capability
- Input under-voltage shutdown feature
- PWM pulses controlled through latching for multiple pulse inhibition
- Dual totem pole driver configuration supported
Pinout of the SG3525 PWM Controller IC
| Pin Number | Description |
|---|---|
| 1 | Inverting pin: If voltage > non-inverting pin, duty cycle increases. |
| 2 | Non-inverting pin: If voltage > inverting pin, duty cycle decreases. |
| 3 | Synchronization pin: Used for synchronization of two waves. |
| 4 | Oscillator output: Provides the output of an oscillator. |
| 5 | Frequency set pin: Used with pin 6 and 7 to set the PWM frequency. |
| 6 | Frequency set pin: Used with pin 5 and 7 to set the PWM frequency. |
| 7 | Frequency set pin: Used with pin 5 and 6 to set the PWM frequency. |
| 8 | Soft start pin (SS): Enables output after a delay. Higher capacitance increases delay. |
| 9 | Compensation pin: Used with feedback to stabilize output voltage against rapid changes. |
| 10 | Shutdown pin: 0 = active, 1 (5V) = shutdown mode. |
| 11 | Output pin: Provides input to MOSFETs, built-in MOSFET driver. |
| 12 | Ground |
| 13 | Vc (Power pin): Should be between 5-35V. |
| 14 | Output pin: Provides input to MOSFETs, built-in MOSFET driver. |
| 15 | Vin (Power pin): Should be between 8-35V. |
| 16 | Reference pin: Used to set reference voltage or provide 5V to the shutdown pin. |
Applications
- Used in power electronics applications like pure sine wave inverters.
- Generates regulated voltage for DC-DC converters (buck, boost, cuk, etc.).