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參數(shù)資料
| 型號(hào)： | AAT1171IWP-1-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | 600mA Voltage-Scaling Step-Down Converter for RF Power Amplifiers with Bypass Switch |
| 中文描述： | 600毫安電壓調(diào)節(jié)射頻功率放大器的旁路開關(guān)降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 17/22頁 |
| 文件大?。?/td> | 797K |
| 代理商： | AAT1171IWP-1-T1 |
In applications where the input power source lead
inductance cannot be reduced to a level that does
not affect the converter performance, a high ESR
tantalum or aluminum electrolytic capacitor (C3 of
Figure 4) should be placed in parallel with the low
ESR, ESL bypass ceramic capacitor. This damp-
ens the high Q network and stabilizes the system.
DAC Programming Gain
The output voltage is dynamically controlled by the
DAC input voltage. The DAC to output gain is fixed
at 3. The typical response time for a 0.2V to 1.2V
pulsed signal on the DAC input is less than 30μs.
The DAC gain can be reduced by an external resis-
tive divider at the DAC input, as shown in the eval-
uation board schematic in Figure 2. For a DAC to
output gain of 2 and R2 at 10k
Ω
, R1 is 4.99k
Ω
.
Thermal Calculations
There are three types of losses associated with the
AAT1171 step-down converter: switching losses,
conduction losses, and quiescent current losses.
Conduction losses are associated with the R
DS(ON)
characteristics of the power MOSFET devices.
Switching losses are dominated by the gate charge
of the power MOSFET devices. The AAT1171 main
and synchronous power MOSFETs are sized to
have similar R
DS(ON)
values that track with the input
voltage. At full load, assuming continuous conduc-
tion mode (CCM), a simplified form of the step-
down converter losses is given by:
I
Q
is the step-down converter quiescent current.
The term t
sw
is used to estimate the full load switch-
ing losses, which are dominated by the gate charge
losses.
P
TOTAL
= I
O
2
· R
DS(ON)
+ (t
SW
· F
S
· I
O
+ I
Q
) · V
IN
(3- G
DAC
)R2
G
DAC
(3 - 2)10k
Ω
2
R1 =
=
= 4.99k
Ω
AAT1171
600mA Voltage-Scaling Step-Down Converter
for RF Power Amplifiers with Bypass Switch
1171.2006.06.1.0
17
Figure 2: AAT1171 Evaluation Board Schematic.
2.2μH
L1
4.7μF
C2
BYPASS
On Off
4.7μF
C1
1
2
3
3
2
1
1
2
3
ENABLE
Off
V
OUT
DAC
VOUT
2
N/C
1
PGND
11
EN
7
BYPASS
8
VIN
10
VOUT
3
LX
12
MODE/SYNC
9
DAC
6
AGND
5
VCC
4
AAT1171
U1
V
IN
GND
L1 SD3112-2R2 or LPF2010-2R2
C1, C
OUT
4.7μF 10V 0805
SYNC
PWM
LL
R1
R2
GND
On
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