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ST755 Datasheet(PDF) 4 Page - STMicroelectronics

Part # ST755
Description  ADJUSTABLE INVERTING NEGATIVE OUTPUT CURRENT MODE PWM REGULATORS
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST755 Datasheet(HTML) 4 Page - STMicroelectronics

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APPLICATION CIRCUIT
To achieve the best performances from switching
power supply topology, particular care to layout
drawing is needed, in order to minimize EMI and
obtain low noise, jitter free operation moreover, it
ensures the full device functionality. Layout
design proposed on demoboard (see picture 2)
helps to lower the developing time.
Wire lengths must be minimized, filter and
by-pass capacitors C1,C2 and C3 must be low
ESR type, placed as close possible to the
integrated circuit. The 10
µH inductor must be
chosen built on a core, taking care that saturation
current should be higher than the peak LX switch
current. See the PEAK INDUCTOR CURRENT
vs. LOAD CURRENT graph ( figure 6)
Figure 1: TYPICAL APPLICATION CIRCUIT
Figure 2: Printed Demoboard
Symbol
Pin
VCC
1
Vout
2
SHDN
3
GND
4
Component Values
Capacitor
Value
Unit
Resistor
Value
Unit
C1
47
µFR1
130
K
C2
100
µFR2
300
K
C3
82
pF
R3
10
K
C4
1
µFR4
40.7
K
C5
10
µFR5
10
K
C6
47
pF
(*) R1 and R2 can be omitted for Iout<200mA.
(**) C6: Very low noise but poor transient and load response speed.
(***) C3 (alternative to C6): faster transient and load response.
ST755
4/9


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