APU3039 Ver la hoja de datos (PDF) - Advanced Power Electronics Corp
Número de pieza
componentes Descripción
Fabricante
APU3039 Datasheet PDF : 22 Pages
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Advanced Power
Electronics Corp.
APU3039
PIN DESCRIPTIONS
PIN#
15
16
17
18
19
20
2,3,5,
11,13,14
PIN SYMBOL
VOUT2
OCSet
SS / SD
Comp
Fb
VP
NC
PIN DESCRIPTION
Output of internal regulator. The output is protected for short circuit. A high frequency
capacitor is recommended to be connected from this pin to ground.
This pin is connected to the Drain of the lower MOSFET via an external resister and it
provides the positive sensing for the internal current sensing circuitry. The external resis-
tor programs the current limit threshold depending on the RDS(ON) of the power MOSFET.
An external capacitor can be placed in parallel with the programming resistor to provide
high frequency noise filtering.
This pin provides soft-start for the switching regulator. An internal current source charges
an external capacitor that is connected from this pin to ground which ramps up the output
of the switching regulator, preventing it from overshooting as well as limiting the input
current. The converter can be shutdown by pulling this pin down below 0.4V.
Compensation pin of the error amplifier. An external resistor and capacitor network is
typically connected from this pin to ground to provide loop compensation.
This pin is connected directly to the output of the switching regulator via resistor divider to
provide feedback to the Error amplifier.
Non-inverting input of error amplifier.
No connection.
BLOCK DIAGRAM
Vcc 4
VREF 1 0.8V
1.25V
Regulator
6V
Bias
3V
0.2V
Generator
1.25V
3V
22uA
SS / SD 17
POR
25K
VP 20
Fb 19
25K
4V
Vc
0.2V
3.5V
64uA Max
Rt
Oscillator
Ct
Enbl
Error Amp
Error Comp
POR
S
Q
R
Reset Dom
Comp 18
OCSet 16
3V
28uA
OC Comp
0.4V
FbLo Comp
POR
15 VOUT2
12 Rt
10 Vc
9 HDrv
Vcc
6 LDrv
7 PGnd
8 Gnd
Figure 2 - Simplified block diagram of the APU3039.
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