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AN937 Datasheet(PDF) 5 Page - STMicroelectronics

Part # AN937
Description  The L4971 is a 1.5 A monolithic dc-dc converter
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN937 Datasheet(HTML) 5 Page - STMicroelectronics

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AN937
Power supply, UVLO and voltage reference
Doc ID 5655 Rev 15
5/29
The oscillator peak-to-valley voltage is proportional to the supply voltage, and the voltage
feed forward is operative from 8 V to 55 V of input supply.
Also the
ΔV/Δt of the sawtooth is directly proportional to the supply voltage. As Vcc
increases, the Ton time of the power transistor decreases in such a way to provide to the
choke, and finally also the load, the product Volt. sec constant.
Figure 6 show how the duty cycle varies as a result of the change on the
ΔV/Δt of the
sawtooth with the Vcc. The output of the error amplifier doesn’t change to maintain the
output voltage constant and in regulation. With this function on board, the output response
time is greatly reduced in presence of an abrupt change on the supply voltage, and the
output ripple voltage at the mains frequency is greatly reduced too.
Figure 5.
Device switching frequency vs Rosc and Cosc
Figure 6.
Voltage feed forward function
ΔV
osc
V
CC
1
6
--------------------
=
0
20
40
60
80
R2(K
Ω)
5
10
20
50
100
200
500
fsw
(KHz)
D97IN630
0.82nF
1.2nF
2.2nF
3.3nF
4.7nF
5.6nF
Tamb=25˚C
V1
V2-3
D97IN684
Vi=30V
Vi=15V
Vc
t
Vi=30V
Vi=15V
t


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