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PDF AAT1102 Data sheet ( Hoja de datos )
| Número de pieza | AAT1102 | |
| Descripción | ADVANCED PWM DC-DC CONVERTER | |
| Fabricantes | Advanced Analog Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AAT1102 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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Advanced Analog Technology, Inc.
AAT1102
Product information presented is current as of publication date. Details are subject to change without notice
ADVANCED PWM DC-DC CONVERTER WITH
INTERNAL SWITCH AND SOFT-START
www.DataShFeEet4AU1..cT6oAmU,R0.E23SΩ, Internal Switch
High Efficiency: 90%
Adjustable Output: VDD to 12.5V
Adjustable Frequency: 640kHz or 1.3MHz
Wide Input Range: +2.6V to +5.5V
Low Shutdown Current: 0.1µA
Programmable Soft-Start
Small 8-Pin MSOP Package
PIN CONFIGURATION
TOP VIEW
EO 1
8 SS
IN 2
SHDN 3
AAT1102
7 FREQ
6 VDD
GND 4
5 SW
8-Pin MSOP
GENERAL DESCRIPTION
The AAT1102 is a step-up DC-DC converter with
a 1.6A, 0.23Ω internal switch. Equipped with an
external compensation pin, this device offers user
flexibility in determining loop dynamic and
adjusting operating frequency. AAT1102 also
allows the use of small, low equivalent resistance
(ESR) ceramic output capacitor, and it’s capable
of converting a standard input of 3.3V to multiple
outputs of 8V, − 8V , and 23V. Furthermore,
filtering and loop performance are facilitated and
enhanced by a high switching frequency of either
640 kHz or1.3MHz.
The AAT1102’s versatility comes with a
power-smart design. A soft-start programmed
with an external capacitor that sets the input
current ramp rate, reduces the current
consumption to 0.1µA in shutdown mode. When
operating, a mere 2.6V input yields an impressive
output voltage as high as 12.5V.
High switching frequency and economical design
allow AAT1102 to be less than 1.1mm high. Its
compact 8-pin MSOP package and superior
performance make it an ideal part for biasing TFT
displays.
– ᣊֺઝݾैٝڶૻֆ –
– Advanced Analog Technology, Inc. –
Page 1 of 18
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Advanced Analog Technology, Inc.
Typical Operating Characteristics
AAT1102
ˌˈ
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S TEP - UP REG ULATOR OUTP UT V OLTAG E
v s . LOAD CURRENT(V MAIN= 8 . 3 V )
ˋˁˇ ˋˁˇ
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LOAD CURRENT(mA)
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M AX IM UM IND UC TOR C UR R ENT(VMAIN= 8 . 3 V)
v s . INPUT VOLTAGE
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INPUT VOLTAGE(V)
– ᣊֺઝݾैٝڶૻֆ –
– Advanced Analog Technology, Inc. –
Page 5 of 18
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Advanced Analog Technology, Inc.
Current Sampling Transfer
Function
Error voltage to duty transfer function Fm is:
( )( )( )Fm (s) =
d
vei
=
2 fs2 s2
Tpi0 Rcs s
+ 2ξwn
s + wzi
s + wn2
s + wsh
www.DataSheet4U.com
Where wsh
=
3ws
π
1
1
−
+
α
α
,α
=
M2
M1
− Ma
+ Ma
,
ws = 2π . f s
=
βgm Rc
s + wc
s
12 f s 2T p0
Rcs T pi 0
×
(s + wz1 )(s − wz2 )
(s + wzi )(s 2 + sws h + 12 f s 2 )
Where β
=
VFB
Vo
,
AAT1102
The compensator transfer function
Therefore, Fm depends on duty to inductor current
transfer functionTpi , and f s is the clock switching
Tc (s) =
vc
v fb
=
g m Rc
s + wc
s
,
where
wc
=
1
RcCc
frequency; Rcs is the current-sense amplifier
transresistance. For the boost converter M 1 =VIN / L
and M 2 = (VO -VIN )/ L
For AAT1102 , Rcs = 0.275 V/A, M a is slope
compensation, M a =0.8ͪ106.
The closed-current loop transfer functionTicl is:
( ( ) )( )Ticl (s)
=
12 f s 2
RcsT pi 0
×
s 2 + 2ξwn s + wn 2
s + wzi s 2 + wsh s + 12 f s 2
Fig.3. Voltage loop compensator
The Voltage-Loop Gain With
Current Loop Closed
The control to output voltage transfer function Td
is:
Td
(s)
=
vo (s)
vc (s)
=
Ticl
(s)Tp (s)
The voltage-loop gain with current loop closed is:
Compensator design guide:
1.
Crossover
frequency
f ci
<
1
2
fs
2. Gain margin>10dB
3. Phase margin>40ш
4. The Lvi (s) = 1 at crossover frequency, Therefore,
the compensator resistance, Rc is determined
by:
Lvi (s) = βTc (s)Td (s) ʳ
– ᣊֺઝݾैٝڶૻֆ –
– Advanced Analog Technology, Inc. –
Page 11 of 18
V4.0
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AAT1102.PDF ] | |
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