LM5117PMH/NOPB National Semiconductor, LM5117PMH/NOPB Datasheet - Page 26

• Manufacturer Part Number: LM5117PMH/NOPB
• Description: IC BUCK CONTROLLER 20-TSSOP
• Manufacturer: National Semiconductor
• Series: -r

Specifications of LM5117PMH/NOPB

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 530kHz
• Duty Cycle: 95%
• Voltage - Supply: 5.5 V ~ 65 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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STEP2: Determine required R
Knowing f
The standard value of 27.4kΩ was selected for R
STEP3: Determine C
Knowing R
CROSS
COMP
, R
, C
COMP
COMP
COMP
is calculated as follows:
is calculated as follows:
to cancel load pole
COMP
COMP
26
The standard value of 22nF was selected for C
STEP4: Determine C
Knowing R
Half of the maximum ESR is assumed as a typical ESR. The
standard value of 180pF was selected for C
COMP
and C
HF
COMP
to cancel ESR zero
, C
HF
is calculated as follows:
HF
.
COMP