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參數(shù)資料
| 型號： | CONFIGURE |
| 英文描述： | Configure Low-Cost Buck Controller for Boost Operation (21k) |
| 中文描述： | 配置低成本降壓控制器，用于升壓操作（21k） |
| 文件頁數(shù)： | 2/3頁 |
| 文件大?。?/td> | 21K |
| 代理商： | CONFIGURE |
L is the output inductor and C is the output capacitor.
The output filter double pole is counteracted by the output capacitor zero, which occurs at a frequency F
z
:
Where R
esr
is the Equivalent Series Resistance of the output capacitor.
The output inductor, capacitor and the capacitor’s ESR must be selected so that the double pole occurs first
and then the output capacitor zero and then the RHPZ. This assures that the loop gain crosses 0db at a
slope that is first order (20db/decade) and that the instability inherently associated with the RHPZ is
circumvented by crossing 0db before the RHPZ frequency occurs. Fortunately, the high gain-bandwidth of
the SC1101 error amplifier simplifies the component selection. In the application noted here, increasing
the output capacitor to a value greater than 330uf alleviates the problem.
The output charge pump voltage inverter has been added to obtain –12V at .5 Amps as well. The +12V is
rectified using a Fast Silicon rectifier, rather than a Schottky diode. This is done to balance the voltage
drops in the –12V rectifier circuits (2 Schottky drops) with the +12V rectifier drop. Since this application is
power limited by the current sense resistor, the current drawn from the –12V supply may be traded off for
current on +12V. If the –12V is not used, the +12V can deliver 1 Amp and D1, D2, C1 and C2 may be
eliminated. To improve efficiency, D4 may then be a Schottky diode. The controller provides separate
grounds for power drive reference (PGND) and analog circuitry common (GND). These two grounds must
be connected at the controller. Other voltages and currents may be achieved by modifying the feedback
resistor and the power components.
With dual output (+/- 12V, 500 ma), the circuit efficiency was measured to be 91% at Vin=5.0V and 93%
at Vin=5.5V. For applications exceeding 50 deg C ambient, a slightly larger core may be used.
)
Vo
Vi
(
1
D
÷
=
)
C
R
(
1
F
2
Wz
out
esr
z
×
÷
=
×
Π
=
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