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Part Number: SG3825C
Description: The SG1825C is a high-performance pulse width modulator optimized for high frequency current-mode powe...
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SG3825C
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DataSheet
General Description
SG3825C General Description
The SG1825C is a high-performance pulse width modulator optimized for high frequency current-mode power supplies. Included in the controller are a precision voltage reference, micropower start-up circuitry, softstart, high-frequency oscillator, wideband error amplifier, fast currentlimit comparator, full double-pulse suppression logic, and dual totempole output drivers. Innovative circuit design and an advanced linear Schottky process result in very short propagation delays through the current limit comparator, logic, and output drivers. This device can be used to implement either currentmode or voltage-mode switching power supplies. It also is useful as a series-resonant controller to frequencies beyond 1MHz. The SG1825C is specified for operation over the full military ambient temperature range of -55 to 125. The SG2825C is characterized for the industrial range of -25 to 85, and the SG3825C is selected for the commercial range of 0 to 70.
SG3825C Maximum Ratings
Input Voltage (VIN and VC) .................................................... 30V
Analog Inputs:
Error Amplifier and Ramp ......................................... -0.3V to 7.0V
Softstart and ILIM/S.D. ............................................ -0.3V to 6.0V
Digital Input (Clock) .................................................. 1.5V to 6.0V
Driver Outputs ...................................................-0.3V to VC+1.5V
Source / Sink Output Current (each output):
Continuous ........................................................................... 0.5A
Pulse, 500ns ......................................................................... 2.0A
Softstart Sink Current ......................................................... 20mA
Clock Output Current ............................................................ 5mA
Error Amplifier Output Current .............................................. 5mA
Oscillator Charging Current .................................................. 5mA
Operating Junction Temperature:
Hermetic (J, L Package) ...................................................... 150
Plastic (DW, N, Q Packages) ............................................... 150
Storage Temperature Range....................................... to 150
Lead Temperature (soldering, 10 seconds) ....................... 300
Note 1. Exceeding these ratings could cause damage to the device.
Analog Inputs:
Error Amplifier and Ramp ......................................... -0.3V to 7.0V
Softstart and ILIM/S.D. ............................................ -0.3V to 6.0V
Digital Input (Clock) .................................................. 1.5V to 6.0V
Driver Outputs ...................................................-0.3V to VC+1.5V
Source / Sink Output Current (each output):
Continuous ........................................................................... 0.5A
Pulse, 500ns ......................................................................... 2.0A
Softstart Sink Current ......................................................... 20mA
Clock Output Current ............................................................ 5mA
Error Amplifier Output Current .............................................. 5mA
Oscillator Charging Current .................................................. 5mA
Operating Junction Temperature:
Hermetic (J, L Package) ...................................................... 150
Plastic (DW, N, Q Packages) ............................................... 150
Storage Temperature Range....................................... to 150
Lead Temperature (soldering, 10 seconds) ....................... 300
Note 1. Exceeding these ratings could cause damage to the device.
SG3825C Features
· IMPROVED REFERENCE INITIAL TOLERANCE (±1% max.)
· IMPROVED OSCILLATOR INITIAL ACCURACY (±3% typ.)
· IMPROVED STARTUP CURRENT (500µA typ.)
· PROP DELAY TO OUTPUTS (50ns typ.)
· 10V TO 30V OPERATION
· 5.1V REFERENCE TRIMMED TO ±1%
· 2MHZ OSCILLATOR CAPABILITY
· 1.5A PEAK TOTEM-POLE DRIVERS
· U.V. LOCKOUT WITH HYSTERESIS
· NO OUTPUT DRIVER "FLOAT"
· PROGRAMMABLE SOFTSTART
· DOUBLE-PULSE SUPPRESSION LOGIC
· WIDEBAND LOW-IMPEDANCE ERROR AMPLIFIER
· CURRENT-MODE OR VOLTAGE-MODE CONTROL
· WIDE CHOICE OF HIGH-FREQUENCY PACKAGES
· IMPROVED OSCILLATOR INITIAL ACCURACY (±3% typ.)
· IMPROVED STARTUP CURRENT (500µA typ.)
· PROP DELAY TO OUTPUTS (50ns typ.)
· 10V TO 30V OPERATION
· 5.1V REFERENCE TRIMMED TO ±1%
· 2MHZ OSCILLATOR CAPABILITY
· 1.5A PEAK TOTEM-POLE DRIVERS
· U.V. LOCKOUT WITH HYSTERESIS
· NO OUTPUT DRIVER "FLOAT"
· PROGRAMMABLE SOFTSTART
· DOUBLE-PULSE SUPPRESSION LOGIC
· WIDEBAND LOW-IMPEDANCE ERROR AMPLIFIER
· CURRENT-MODE OR VOLTAGE-MODE CONTROL
· WIDE CHOICE OF HIGH-FREQUENCY PACKAGES
SG3825C Typical Application
1. HIGH-SPEED LAYOUT AND BYPASSING
2. MICROPOWER STARTUP
3. SOFTSTART FAST RESET
4. OSCILLATOR SYCHRONIZATION
5. OSCILLATOR FUNCTIONAL DIAGRAM
6. VOLTAGE AMPLIFIER CONNECTIONS
7. DRIVING SHIELDED CABLE
2. MICROPOWER STARTUP
3. SOFTSTART FAST RESET
4. OSCILLATOR SYCHRONIZATION
5. OSCILLATOR FUNCTIONAL DIAGRAM
6. VOLTAGE AMPLIFIER CONNECTIONS
7. DRIVING SHIELDED CABLE
SG3825C Connection Diagram
SG3825CDW
PDF/DataSheet Download
- Datasheet: SG3825CDW
- File Size: 189035 KB
- Manufacturer: MICROSEMI [Microsemi Corporation]
- Click here to Download
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