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參數(shù)資料
| 型號(hào)： | AAT2513 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | Dual 600mA Step-Down Converter with Synchronization |
| 中文描述： | 雙600mA降壓轉(zhuǎn)換器的同步 |
| 文件頁(yè)數(shù)： | 11/22頁(yè) |
| 文件大小： | 693K |
| 代理商： | AAT2513 |
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AAT2513
Dual 600mA Step-Down
Converter with Synchronization
2513.2007.04.1.1
11
Figure 1: AAT2513 Typical Schematic.
2.2uH
L1
4.7μF
C1
1.8V
118k
R1
2.2μH
L2
2.5V
R4
59.0k
R2
59.0k
10μF
C3
V
IN
187k
R3
FB1
4
EN1
10
LX1
7
PGND2
13
LX2
14
PGND1
8
AGND
2
VIN1
5
VIN2
16
PS
1
FB2
3
EN2
9
VCC
11
MODE/SYNC
12
N/C
6
N/C
15
AAT2513
U1
C2
4.7μF
Low Supply UVLO
Under-voltage lockout (UVLO) guarantees suffi-
cient V
IN
bias and proper operation of all internal
circuitry prior to activation.
Fault Protection
For overload conditions, the peak inductor current
is limited. Thermal protection disables the convert-
er when the internal dissipation or ambient temper-
ature becomes excessive. The over-temperature
threshold for the junction temperature is 140°C with
15°C of hysteresis.
PWM/LL Operation
For fixed frequency, with minimum ripple under
light load conditions, the MODE/SYNC pin should
be tied to a logic high. For more efficient operation
under light load conditions the MODE/SYNC pin
should be tied to a logic low level.
Clock Phase and Frequency
A logic high on the PS pin while in PWM mode
forces both converters to operate 180° out of phase
thus reducing the input ripple by roughly half. A
logic low on the PS pin synchronizes both convert-
ers in phase.
Applications Information
Inductor Selection
The step down converter uses peak current mode
control with slope compensation to maintain stability
for duty cycles greater than 50%. The output induc-
tor value must be selected so the inductor current
down slope meets the internal slope compensation
requirements. The internal slope compensation for
the adjustable and low voltage fixed versions of the
AAT2513 is 0.6A/μsec. This equates to a slope com-
pensation that is 75% of the inductor current down
slope for a 1.8V output and 2.2μH inductor.
In this case a standard 3.3μH value is selected.
0.75
V
O
L = =
≈
1.2
V
O
m
0.6
= 1.2 A
0.75V
V
O
μs
A
μs
A
μs
0.75
V
m = L
0.75
1.8V
2.2μH
A
μsec
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