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AN1517 Datasheet(PDF) 5 Page - STMicroelectronics

Part # AN1517
Description  Designing with the STEVAL-ISA089V1 high efficiency DC-DC
PDF  30 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1517 Datasheet(HTML) 5 Page - STMicroelectronics

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AN1517
Pin functions
30
1
Pin functions
Pin description
Figure 4. Block diagram
Table 1. Pin description
N. Name
Description
1
OUT
Regulator output.
2GND
Ground. Lead connected directly to the frame in order to reduce the junction to ambient
thermal resistance.
3GND
Ground. Lead connected directly to the frame in order to reduce the junction to ambient
thermal resistance.
4 COMP E/A output to be used for frequency compensation.
5FB
Step-down feedback input. Connecting the output voltage directly to this pin results in
an output voltage of 1.235 V. An external resistor divider is required for higher output
voltages (the typical value for the resistor connected between this pin and ground is
4.7 k
).
6GND
Ground. Lead connected directly to the frame in order to reduce the junction to ambient
thermal resistance.
7GND
Ground. Lead connected directly to the frame in order to reduce the junction to ambient
thermal resistance.
8VCC
Unregulated DC input voltage.
VOLTAGES
MONITOR
PEAK TO PEAK
CURRENT LIMIT
THERMAL
SHUTDOWN
E/A
PWM
1.235V
+
-
-
+
OSCILLATOR
D
Ck
Q
FREQUENCY
SHIFTER
TRIMMING
SUPPLY
1.235V
3.5V
DRIVER
VREF
BUFFER
LPDMOS
POWER
FB
GND
COMP
GND
GND
GND
OUT
VCC
AM00028v1



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