L6738ATR STMicroelectronics, L6738ATR Datasheet - Page 23

• Manufacturer Part Number: L6738ATR
• Description: IC PWM CTLR 1PH STPDN 16-VFQFPN
• Manufacturer: STMicroelectronics

Specifications of L6738ATR

• Frequency - Max: 220kHz
• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Duty Cycle: 100%
• Voltage - Supply: 5 V ~ 12 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 32-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-11012-2

L6738A
Figure 10. Example of type III compensation.
●
●
To place the poles and zeros of the compensation network, the following suggestions may
be followed:
compensation
converter gain
loop gain
open loop
EA gain
closed
open loop
Open loop converter singularities:
a)
b)
Compensation Network singularities frequencies:
a)
b)
c)
d)
gain
F
Gain
F
F
[dB]
0dB
F
F
Z1
F
ESR
Z2
P1
LC
P2
=
=
=
=
=
=
----------------------------------- -
2π
----------------------------------------------------------
2π
--------------------------------------------------------
2π
------------------------------------ -
2π L
----------------------------------- -
2π
------------------------------------------------ -
2π
⋅
⋅
⋅
⋅
⋅
R
(
1
R
R
R
F
C
⋅
1
1
F
FB
S
⋅
OUT
⋅
C
⋅
1
1
C
1
+
OUT
⎛
⎝
F
C
C
--------------------- -
C
R
⋅
S
F
F
S
F
Doc ID 18134 Rev 1
ESR
)
⋅
+
Z1
⋅
C
C
F
F
C
P
LC
P
Z2
⎞
⎠
S
F
F
ESR
P1
F
0dB
F
P2
20log (R
Application details
F
/R
20log (V
FB
Log (Freq)
)
IN
/∆V
23/32
OSC
)