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L7983 Datasheet(PDF) 10 Page - STMicroelectronics

Part # L7983
Description  60 V, 300 mA synchronous step-down switching regulator with 10 μA quiescent current
PDF  43 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7983 Datasheet(HTML) 10 Page - STMicroelectronics

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Figure 4. Control loop block diagram
Ro
Ru
Rd
VREF
L
Rc
Cc
Vin
Slope
compensation
Current
sense
PWM
Comparator
Power
Switches
FB
Cp
Cu
Vout
Co
HS
LS
+
+ gcs
E/A
Integrated
compensation
Refer to Section 5.7 for further details on power components design.
For the adjustable version (L7983PUR), the output voltage can be programmed through an external resistor
divider, from 0.85 V up to VIN.
The design equation is:
VOUT=0.85∙ 1+RURD
(1)
For the fixed version (L7983PU33R or L7983PU50R), the output voltage programming is achieved by simply
shorting the VOUT(FB) pin to the output capacitor.
L7983
Control loop and voltage programming
DS13354 - Rev 1
page 10/43



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