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PDF APU3037A Data sheet ( Hoja de datos )
| Número de pieza | APU3037A | |
| Descripción | 8-PIN SYNCHRONOUS PWM CONTROLLER | |
| Fabricantes | Advanced Power Electronics | |
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Technology Licensed from International Rectifier
APU3037 / APU3037A
8-PIN SYNCHRONOUS PWM CONTROLLER
FEATURES
Synchronous Controller in 8-Pin Package
Operating with single 5V or 12V supply voltage
Internal 200KHz Oscillator
(400KHz for APU3037A)
Soft-Start Function
Fixed Frequency Voltage Mode
500mA Peak Output Drive Capability
Protects the output when control FET is shorted
RoHS Compliant
APPLICATIONS
DDR memory source sink Vtt application
Low cost on-board DC to DC such as 5V to 3.3V,
2.5V or 1.8V
Graphic Card
www.DataSheet4U.comHard Disk Drive
DESCRIPTION
The APU3037 controller IC is designed to provide a low
cost synchronous Buck regulator for on-board DC to DC
converter applications. With the migration of today’s ASIC
products requiring low supply voltages such as 1.8V and
lower, together with currents in excess of 3A, traditional
linear regulators are simply too lossy to be used when
input supply is 5V or even in some cases with 3.3V
input supply. The APU3037 together with dual N-channel
MOSFETs such as AP60T03, provide a low cost solution
for such applications. This device features an internal
200KHz oscillator (400KHz for "A" version), under-volt-
age lockout for both Vcc and Vc supplies, an external
programmable soft-start function as well as output un-
der-voltage detection that latches off the device when an
output short is detected.
TYPICAL APPLICATION
C3
0.1uF
12V
C4
1uF
C2
10TPB100M,
100uF, 55mV
L1
1uH
5V
C1
47uF
C8
0.1uF
C9
2200pF
R4
24k
Vcc Vc
HDrv
SS/SD U1
APU3037
LDrv
Comp
Gnd
Fb
1N4148
Q1
AP60T03GH
Q2
AP60T03GH
L2
5.6uH, 5.3A
R3
249, 1%
R5
1.24K, 1%
1.5V/5A
C7
2x 6TPC150M,
150uF, 40mV
Figure 1 - Typical application of APU3037 or APU3037A.
PACKAGE ORDER INFORMATION
TA (°C)
0 To 70
0 To 70
0 To 70
0 To 70
DEVICE
PACKAGE
FREQUENCY
APU3037O
8-Pin Plastic TSSOP (O)
200KHz
APU3037M/MP 8-Pin Plastic SOIC NB (M/MP) 200KHz
APU3037AO
8-Pin Plastic TSSOP (O)
400KHz
APU3037AM/AMP 8-Pin Plastic SOIC NB (M/MP) 400KHz
Data and specifications subject to change without notice.
200507075-1/18
1 page  
APU3037 / APU3037A
APPLICATION INFORMATION
Design Example:
The following example is a typical application for APU3037,
the schematic is Figure 18 on page 14.
VIN = 5V
VOUT = 3.3V
IOUT = 4A
DVOUT = 100mV
fS = 200KHz
Soft-Start Programming
The soft-start timing can be programmed by selecting
the soft start capacitance value. The start up time of the
converter can be calculated by using:
tSTART = 753Css (ms)
---(2)
Where:
CSS is the soft-start capacitor (mF)
Output Voltage Programming
Output voltage is programmed by reference voltage and
www.DataSheet4Ue.cxotmernal voltage divider. The Fb pin is the inverting input
of the error amplifier, which is internally referenced to
1.25V (0.8V for APU3037A). The divider is ratioed to pro-
vide 1.25V at the Fb pin when the output is at its desired
value. The output voltage is defined by using the follow-
ing equation:
( )VOUT = VREF 3
1 + R6
R5
---(1)
When an external resistor divider is connected to the
output as shown in Figure 3.
APU3037
Fb
VOUT
R6
R5
Figure 3 - Typical application of the APU3037 for
programming the output voltage.
Equation (1) can be rewritten as:
( )R6 = R53
VOUT - 1
VREF
Choose R5 = 1KV
This will result to R6 = 1.65KV
If the high value feedback resistors are used, the input
bias current of the Fb pin could cause a slight increase
in output voltage. The output voltage set point can be
more accurate by using precision resistor.
For a start-up time of 7.5ms, the soft-start capacitor will
be 0.1mF. Choose a ceramic capacitor at 0.1mF.
Shutdown
The converter can be shutdown by pulling the soft-start
pin below 0.5V. The control MOSFET turns off and the
synchronous MOSFET turns on during shutdown.
Boost Supply Vc
To drive the high-side switch it is necessary to supply a
gate voltage at least 4V greater than the bus voltage.
This is achieved by using a charge pump configuration
as shown in Figure 18. The capacitor is charged up to
approximately twice the bus voltage. A capacitor in the
range of 0.1mF to 1mF is generally adequate for most
applications. In application, when a separate voltage
source is available the boost circuit can be avoided as
shown in Figure 1.
Input Capacitor Selection
The input filter capacitor should be based on how much
ripple the supply can tolerate on the DC input line. The
larger capacitor, the less ripple expected but consider
should be taken for the higher surge current during the
power-up. The APU3037 provides the soft-start function
which controls and limits the current surge. The value of
the input capacitor can be calculated by the following
formula:
IIN 3 Dt
CIN = DV
---(3)
Where:
CIN is the input capacitance (mF)
IIN is the input current (A)
Dt is the turn on time of the high-side switch (ms)
DV is the allowable peak to peak voltage ripple (V)
5/18
5 Page 
APU3037 / APU3037A
TYPICAL PERFORMANCE CHARACTERISTICS
www.DataSheet4U.com
14
12
10
8
6
4
2
0
0
APU3037A
Vcc vs. Icc
@470PF, 1150PF and 1540PF Gate Load
TA = 258C
CLOAD =1540pF
CLOAD =1150pF
CLOAD =470pF
2 4 6 8 10 12 14
Vcc (V)
Figure 9 - Vcc vs. Icc
APU3037A
Vc vs. Ic
@470PF, 1150PF and 1540PF Gate Load
TA = 258C
30
25
CLOAD =1540pF
20
CLOAD =1150pF
15
10 CLOAD =470pF
5
0
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Vc (V)
Figure 10 - Vc vs. Ic
11/18
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet APU3037A.PDF ] | |
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