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A7985ATR bảng dữ liệu(PDF) 39 Page - STMicroelectronics

tên linh kiện A7985ATR
Giải thích chi tiết về linh kiện  2 A step-down switching regulator for automotive applications
PDF  44 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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A7985ATR bảng dữ liệu(HTML) 39 Page - STMicroelectronics

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A7985A
Application ideas
44
Figure 36. Inverting buck-boost regulator
The GND pin of the device is connected to the output voltage so, given the output voltage,
the input voltage range is limited by the maximum voltage the device can withstand across
VCC and GND (38 V). Therefore, if the output is -5 V, the input voltage can range from 4.5 V
to 33 V.
As in the positive buck-boost, the maximum output current according to application
conditions is shown in Figure 37. The dashed line considers a more accurate estimation of
the duty cycles given by Equation 47, where power losses across diodes and the internal
Power MOSFET are taken into account.
Equation 47
Figure 37. Maximum output current according to switch max. peak current (2.0 A):
VO = -5 V
D
VOUT VD
–
V
– IN VSW VOUT VD
–
+
–
-----------------------------------------------------------------
=



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