lm4510sdx National Semiconductor Corporation, lm4510sdx Datasheet - Page 10

• Manufacturer Part Number: lm4510sdx
• Description: Synchronous Step-up Dc/dc Converter With True Shutdown Isolation
• Manufacturer: National Semiconductor Corporation

www.national.com
Block Diagram
Operation Description
LM4510 is a peak current-mode, fixed-frequency PWM boost
regulator
Non-Synchronous Switching.
The DC/DC regulator regulates the feedback output voltage
providing excellent line and load transient response. The op-
eration of the LM4510 can best be understood by referring to
the Block Diagram.
NON-SYNCHRONOUS OPERATION
The device operates in Non-synchronous Mode at light load
(I
At light load, LM4510 automatically changes its switching op-
eration from 'Synchronous' to 'Non-Synchronous' depending
on V
mizes power efficiency by reducing PMOS driving loss.
OUT
IN
< 10 mA) or when output voltage is lower than 10V (typ.).
and L. Non-Synchronous operation at light load maxi-
that
employs
both
Synchronous
FIGURE 2. LM4510 Block Diagram
and
10
OPERATION IN SYNCHRONOUS CONTINUOUS CON-
DUCTION MODE (CYCLE 1, CYCLE 2)
FIGURE 3. Schematic of Synchronous Boost Converter
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