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LM3224 Datasheet(PDF) 3 Page - Texas Instruments

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Part # LM3224
Description  615kHz/1.25MHz Step-up PWM DC/DC Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3224 Datasheet(HTML) 3 Page - Texas Instruments

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PWM
COMP
OVP
COMP
ERROR
AMP
UVP
COMP
LOGIC
Drive
UVP
Reset
OVP
Set
Reset
Thermal
SD
Oscillator
Duty
Cycle Limit
Load Current
Measurement
Driver
Shutdown
Comparator
Thermal
Shutdown
Bandgap Voltage
Reference
+
-
-
+
BG
-
+
BG
+
BG
-
SHDN
VIN
GND
VC
FSLCT
¦
SW
FB
SS
LM3224
www.ti.com
SNVS277B – DECEMBER 2004 – REVISED SEPTEMBER 2005
Block Diagram
General Description
The LM3224 utilizes a PWM control scheme to regulate the output voltage over all load conditions. The operation
can best be understood referring to the block diagram and Figure 2 of the Operation section. At the start of each
cycle, the oscillator sets the driver logic and turns on the NMOS power device conducting current through the
inductor, cycle 1 of Figure 2 (a). During this cycle, the voltage at the VC pin controls the peak inductor current.
The VC voltage will increase with larger loads and decrease with smaller. This voltage is compared with the
summation of the SW voltage and the ramp compensation. The ramp compensation is used in PWM
architectures to eliminate the sub-harmonic oscillations that occur during duty cycles greater than 50%. Once the
summation of the ramp compensation and switch voltage equals the VC voltage, the PWM comparator resets the
driver logic turning off the NMOS power device. The inductor current then flows through the schottky diode to the
load and output capacitor, cycle 2 of Figure 2 (b). The NMOS power device is then set by the oscillator at the
end of the period and current flows through the NMOS power device once again.
The LM3224 has dedicated protection circuitry running during normal operation to protect the IC. The Thermal
Shutdown circuitry turns off the NMOS power device when the die temperature reaches excessive levels. The
UVP comparator protects the NMOS power device during supply power startup and shutdown to prevent
operation at voltages less than the minimum input voltage. The OVP comparator is used to prevent the output
voltage from rising at no loads allowing full PWM operation over all load conditions. The LM3224 also features a
shutdown mode decreasing the supply current to 0.1µA (typ.).
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Copyright © 2004–2005, Texas Instruments Incorporated
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