L5983TR STMicroelectronics, L5983TR Datasheet - Page 23

• Manufacturer Part Number: L5983TR
• Description: IC REG SW 1.5A STEPDOWN 8-VFQFPN
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L5983TR

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 18 V
• Current - Output: 1.5A
• Frequency - Switching: 250kHz ~ 1MHz
• Voltage - Input: 2.9 ~ 18 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-VFQFN, 8-VFQFPN
• Power - Output: 1.5W
• For Use With: 497-6386 - BOARD EVAL FOR L5983
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6860-2; L5983TR

L5983
5.4.2
Type II compensation network
If the equivalent series resistance (ESR) of the output capacitor introduces a zero with a
frequency lower than the desired bandwidth (that is: 2π * ESR * C
helps stabilize the loop. Electrolytic capacitors show not negligible ESR (>30 mΩ), so with
this kind of output capacitor the type II network combined with the zero of the ESR allows
the loop to be stabilized.
In
Figure 13. Type II compensation network
The singularities of the network are:
In
and the open loop gain (G
Figure 13
Figure 14
the type II network is shown.
the Bode diagram of the PWM and LC filter transfer function (G
f
Z1
=
----------------------------- -
2π R
LOOP
⋅
1
Doc ID 13005 Rev 7
4
(f) = G
⋅
C
4
,
PW0
f
P0
· G
=
LC
0
,
(f) · G
f
P1
TYPEII
=
------------------------------------------- -
2π R
⋅
(f)) is given.
4
⋅
1
------------------- -
C
C
OUT
4
4
Application information
+
⋅
C
C
5
> 1/BW), this zero
5
PW0
· G
LC
(f))
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