LTC1922EG-1 Linear Technology, LTC1922EG-1 Datasheet - Page 6

• Manufacturer Part Number: LTC1922EG-1
• Description: IC CTRLR PWM SYNC 20SSOP
• Manufacturer: Linear Technology

Specifications of LTC1922EG-1

• Pwm Type: Voltage/Current Mode
• Number Of Outputs: 1
• Frequency - Max: 1MHz
• Duty Cycle: 99%
• Buck: No
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SSOP
• Frequency-max: 1MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Supply: -

PIN
LTC1922-1
SYNC (Pin 1): Synchronization Input/Output for the
Oscillator. Terminate SYNC with a 5.1k resistor to GND.
RAMP (Pin 2): Input to Phase Modulator Comparator. The
voltage on RAMP is internally level shifted by 400mV.
CS (Pin 3): Input to Current Limit Comparators, Output of
Slope Compensation Circuitry.
COMP (Pin 4): Error Amplifier Output, Input to Phase
Modulator.
R
Use a 10k to 100k resistor to program from 40ns to 310ns
of leading edge blanking. A 1% tolerance resistor is
recommended. Leading edge blanking may be defeated by
connecting R
FB (Pin 6): Error Amplifier Inverting Input. This is the
voltage feedback input for the LTC1922-1.
SS (Pin 7): Soft-Start/Restart Delay Circuitry Timing
Capacitor.
PDLY (Pin 8): Passive Leg Delay Circuit Input.
SBUS (Pin 9): Input (Bus) Voltage Sensing Input.
ADLY (Pin 10): Active Leg Delay Circuit Input.
6
LEB
U
(Pin 5): Timing Resistor for Leading Edge Blanking.
FUNCTIONS
U
LEB
to V
U
REF
.
V
supplying up to 15mA to external circuitry. Bypass V
with a 1 F (minimum) ceramic capacitor to GND.
OUTF (Pin 12): 50mA Driver Output for Secondary Side
Current Doubler Synchronous Rectifier.
OUTE (Pin 13): 50mA Driver Output for Secondary Side
Current Doubler Synchronous Rectifier.
OUTD (Pin 14): 50mA Driver Output for Active Leg Low
Side.
V
Regulator. Bypass V
capacitor to GND.
OUTC (Pin 16): 50mA Driver Output for Active Leg High
Side.
OUTB (Pin 17): 50mA Driver Output for Passive Leg Low
Side.
OUTA (Pin 18): 50mA Driver Output for Passive Leg High
Side.
GND (Pin 19): All Voltages on the LTC1922-1 Are Referred
to GND.
C
better multilayer NPO ceramic for best results.
REF
CC
T
(Pin 20): Timing Capacitor for Oscillator. Use 5% or
(Pin 15): Chip Power Supply Input, 10.3V Shunt
(Pin 11): 5V Reference Output. V
CC
with a 0.1 F or larger ceramic
REF
is capable of
REF