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R5975D Datasheet(PDF) 3 Page - STMicroelectronics

Part # R5975D
Description  Up to 3 A step-down switching regulator for aerospace applications
PDF  47 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

R5975D Datasheet(HTML) 3 Page - STMicroelectronics

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DocID026878 Rev 1
3/47
R5975D
Contents
47
8
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8.1
Component selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8.2
Layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8.3
Thermal considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.3.1
Thermal resistance RTHJ-A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.3.2
Thermal impedance ZTHJ-A(t) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.4
RMS current of the embedded power MOSFET . . . . . . . . . . . . . . . . . . . 32
8.5
Short-circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.6
Positive buck-boost regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.7
Negative buck-boost regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
8.8
Floating boost current generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8.9
Synchronization example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.10
Compensation network with MLCC at the output . . . . . . . . . . . . . . . . . . . 40
8.11
External soft-start network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9
Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
10
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
11
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
12
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46



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