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LT1931 数据表(PDF) 7 Page - Linear Technology

部件名 LT1931
功能描述  1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
Download  12 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT1931 数据表(HTML) 7 Page - Linear Technology

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7
LT1931/LT1931A
1931fa
START-UP/SOFT-START
For most LT1931/LT1931A applications, the start-up in-
rush current can be high. This is an inherent feature of
switching regulators in general since the feedback loop is
saturated due to VOUT being far from its final value. The
APPLICATIO S I FOR ATIO
regulator tries to charge up the output capacitor as quickly
as possible, which results in a large inrush current. Fig-
ure 6 shows a typical oscillograph of the start-up wave-
form for the application of Figure 1 starting into a load of
33
Ω. The lower waveform shows SHDN being pulsed
from 0V to 5V. The middle waveform shows the input
current, which reaches as high as 0.8A. The total time
required for the output to reach its final value is approxi-
mately 500
µs. For some applications, this initial inrush
current may not be acceptable. If a longer start-up time is
acceptable, a soft-start circuit consisting of RSS and CSS,
as shown in Figure 7, can be used to limit inrush current
to a lower value. Figure 8 shows the relevant waveforms
with RSS = 15k and CSS = 33nF. Input current, measured
at VIN, is limited to a peak value of 0.5A as the time required
to reach final value increases to 1ms. In Figure 9, CSS is
VOUT
20mV/DIV
AC COUPLED
IL1A + IL1B
0.5A/DIV
AC COUPLED
200mA
100mA
LOAD
CURRENT
100
µs/DIV
1931 F04
Figure 4. Transient Response of Inverting Converter
with 220pF Phase Lead Capacitor
VOUT
0.1V/DIV
AC COUPLED
IL1A + IL1B
0.5A/DIV
AC COUPLED
200mA
100mA
LOAD
CURRENT
50
µs/DIV
1931 F05
Figure 5. Transient Response of Inverting Converter with 22
µF
Tantalum Output Capacitor and No Phase Lead Capacitor
VIN
VIN
5V
VSS
VOUT
VOUT
–5V
1931 F07
SW
L1A
10
µH
CURRENT
PROBE
L1B
10
µH
D1
GND
LT1931
C1
4.7
µF
RSS
15k
D2
1N4148
C3
22
µF
C2
1
µF
R2
10k
R1
29.4k
C4
220pF
NFB
SHDN
+
CSS
33nF/68nF
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R LMK212BJ105MG
C3: TAIYO YUDEN XR5 JMK325BJ226MM
D1: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CLS62-100
Figure 7. RSS and CSS at SHDN Pin Provide Soft-Start to LT1931 Inverting Converter
VOUT
2V/DIV
IIN
0.5A/DIV
AC COUPLED
5V
0V
VSHDN
500
µs/DIV
1931 F06
Figure 6. Start-Up Waveforms for 5V to – 5V Application
(Figure 1). No Soft-Start Circuit. VOUT Reaches – 5V in
500
µs; Input Current Peaks at 800mA


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