|Category||Power Management => Regulators => Switching Regulators|
|Description||LTC3722, Synchronous Dual Mode Phase Modulated Full Bridge Controller|
|Company||Linear Technology Corporation|
|Datasheet||Download LTC3722EGN-1#PBF datasheet|
LTC3722-1/LTC3722-2 Synchronous Dual Mode Phase Modulated Full Bridge Controllers
Adaptive or Manual Delay Control for Zero Voltage Switching Operation Adjustable Synchronous Rectification Timing for Highest Efficiency Adjustable Maximum ZVS Delay Adjustable System Undervoltage Lockout and Hysteresis Programmable Leading Edge Blanking Very Low Start-Up and Quiescent Currents Current Mode (LTC3722-1) or Voltage Mode (LTC3722-2) Operation Programmable Slope Compensation VCC UVLO and 25mA Shunt Regulator 50mA Output Drivers Soft-Start, Cycle-by-Cycle Current Limiting and Hiccup Mode Short-Circuit Protection 5V, 15mA Low Dropout Regulator
The LTC®3722-1/LTC3722-2 phase shift PWM controllers provide all of the control and protection functions necessary to implement a high efficiency, zero voltage switched (ZVS), full bridge power converter. Adaptive ZVS circuitry delays the turn-on signals for each MOSFET independent of internal and external component tolerances. Manual delay set mode enables secondary side control operation or direct control of switch turn-on delays. The LTC3722-1/LTC3722-2 feature adjustable synchronous rectifier timing for optimal efficiency. A UVLO program input provides accurate system turn-on and turn-off voltages. The LTC3722-1 features peak current mode control with programmable slope compensation and leading edge blanking, while the LTC3722-2 employs voltage mode control with voltage feedforward capability. The LTC3722-1/LTC3722-2 feature extremely low operating and start-up currents. Both devices include a full range of protection features and are available in the 24-pin surface mount (GN) package.
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
VREF Output Current................................ Self Regulated Outputs (A,B,C,D,E,F) Current.......................... ±100mA Operating Temperature Range (Note to 85°C Storage Temperature Range................. to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C
VCC to GND (Low Impedance Source)......... to 10V (Chip Self Regulates at 10.3V) UVLO to GND................................................ 0.3 to VCC All Other Pins to GND (Low Impedance Source)....................... to 5.5V VCC (Current Fed)................................................. 25mA
TOP VIEW SYNC DPRG CS COMP RLEB SS NC PDLY CT 23 GND 22 PGND 21 OUTA 20 OUTB 19 OUTC 18 VCC 17 OUTD 16 OUTE 15 OUTF 14 VREF 13 SPRGConsult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW SYNC RAMP CS COMP DPRG SS NC PDLY CT 23 GND 22 PGND 21 OUTA 20 OUTB 19 OUTC 18 VCC 17 OUTD 16 OUTE 15 OUTF 14 VREF 13 SPRG
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are = 25°C. VCC = 270pF, RDPRG = 60.4k, RSPRG = t MIN to t MAX, unless otherwise noted.
SYMBOL Input Supply VCCUV VCCHY ICCST ICCRN VSHUNT RSHUNT SUVLO SHYST Delay Blocks DTHR DHYS DTMO DFXT DFTM Phase Modulator IRMP ISLP DCMAX DCMIN Oscillator OSCI OSCT OSCV OSYT OSYW OSYR Initial Accuracy Total Variation CT Ramp Amplitude SYNC Threshold Minimum SYNC Pulse Width SYNC Frequency Range = 270pF VCC to 9.5V Measured on CT Measured on SYNC Measured at Outputs (Note 2) Measured at Outputs (Note 2) 1.6
PARAMETER VCC Under Voltage Lockout VCC UVLO Hysteresis Start-Up Current Operating Current Shunt Regulator Voltage Shunt Resistance System UVLO Threshold System UVLO Hysteresis Current Delay Pin Threshold ADLY and PDLY Delay Hysteresis Current ADLY and PDLY Delay Timeout Fixed Delay Threshold Fixed Delay Time Ramp Discharge Current Slope Compensation Current Maximum Phase Shift Minimum Phase Shift
CONDITIONS Measured on VCC Measured on VCC = VUVLO 0.3V No Load on Outputs Current into VCC = 10mA Current into VCC to 17mA Measured on UVLO Pin, 7mA into VCC Current Flows Out of UVLO Pin, 7mA into VCC SBUS = 1.5V SBUS = 2.25V SBUS = 1.5V, ADLY/PDLY = 1.7V RDPRG = 60.4K Measured on SBUS ADLY,PDLY = 1V, SBUS = VREF RAMP = 1V, COMP 4V, LTC3722-1 Only Measured on CS, = 2.25V COMP = 4.5V COMP = 0V
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