A5975DTR STMicroelectronics, A5975DTR Datasheet - Page 20

• Manufacturer Part Number: A5975DTR
• Description: IC REG SW STEP-DOWN 3A 8SOIC
• Manufacturer: STMicroelectronics
• Series: -r
• Type: Step-Down (Buck), PWMr

Specifications of A5975DTR

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.235 V ~ 35 V
• Current - Output: 3A
• Frequency - Switching: 250kHz
• Voltage - Input: 4 V ~ 36 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width) Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11426-2

Closing the loop
20/50
Figure 10. Error amplifier equivalent circuit and compensation network
The poles of this transfer function are (if C
Equation 3
Equation 4
whereas the zero is defined as:
Equation 5
F
the frequency of the double pole of the LC filter (see below). F
frequency.
P1
is the low frequency which sets the bandwidth, while the zero F
Doc ID 018760 Rev 1
F
P2
F
=
F
Z1
P1
--------------------------------------------------- -
2 π R
=
⋅ ⋅
=
---------------------------------
2 π R
c
--------------------------------- -
2 π R
⋅
>> C
⋅
c
⋅
⋅
1
1
⋅
(
1
0
C
c
+C
0
⋅
0
C
⋅
+
P
C
c
C
):
c
p
)
P2
is usually at a very high
Z1
is usually put near to
A5975D