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| LM3478MA_15 Datasheet, PDF (8/26 Pages) Texas Instruments – High-Efficiency Low-Side N-Channel Controller for Switching Regulator | |||
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LM3478MA
SNVS705B â FEBRUARY 2011 â REVISED FEBRUARY 2013
Typical Performance Characteristics (continued)
Unless otherwise specified, VIN = 12V, TJ = 25°C.
Duty Cycle vs Current Sense Voltage
www.ti.com
FA/SD
COMP
Fixed Frequency
Detect
Softstart
1.26V Reference
Gm
Error
Amplifier
FB
Isen
Vfb+Vovp
OVP
Figure 21.
FUNCTIONAL BLOCK DIAGRAM
Oscillator
internal slope
compensation
Under Voltage
Lockout
LDO
internal Vcc
VIN
7.2V
PWM
logic
S
Q
R
DR
DRIVER
AGND
325mV
slope compensation
ramp adjust current
source
Short Circuit
Comparator
THERMAL
LIMIT
(165°C)
PGND
Figure 22.
8
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