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LTC3736EGN-1#PBF 数据手册 - ADI（亚德诺）
制造商:
ADI（亚德诺）
封装:
SSOP
描述:
降压型 2.75V~9.8V 750kHz
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LTC3736EGN-1#PBF数据手册
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11
LTC3736-1
37361f
FREQUENCY (Hz)
–80
AMPLITUDE (dBm)
–20
–10
–90
–100
–30
–60
–40
–50
–70
0 6M 12M 18M 24M 30M
37361 F01a
–110
R
BW
= 3kHz
OPERATIO
U
(Refer to Functional Diagram)
operation enabled) with V
IN
= 5V, V
OUT
= 2.5V and I
OUT
=
1A. Note the significant reduction in peak output noise
(>20dBm).
Short-Circuit Protection
When an output is shorted to ground (V
FB
< 0.12V), the
switching frequency of that controller is reduced to 1/5 of
the normal operating frequency. The other controller is
unaffected and maintains normal operation.
The short-circuit threshold on V
FB2
is based on the smaller
of 0.12V and a fraction of the voltage on the TRACK pin.
This also allows V
OUT2
to start up and track V
OUT1
more
easily. Note that if V
OUT1
is truly short-circuited
(V
OUT1
= V
FB1
= 0V), then the LTC3736-1 will try to
regulate V
OUT2
to 0V if a resistor divider on V
OUT1
is
connected to the TRACK pin.
Figure 1a. Output Noise Spectrum of Conventional Buck
Switching Converter (LTC3736-1 with Spread Spectrum
Disabled) Showing Fundamental and Harmonic Frequencies
FREQUENCY (Hz)
–80
AMPLITUDE (dBm)
–20
–10
–90
–100
–30
–60
–40
–50
–70
37361 F01b
–110
R
BW
= 30Hz
410k 450k 490k 530k 570k 610k
Figure 1b. Zoom-In of Fundamental Frequency of Conventional
Buck Switching Converter
FREQUENCY (Hz)
–80
AMPLITUDE (dBm)
–20
–10
–90
–100
–30
–60
–40
–50
–70
0 6M 12M 18M 24M 30M
37361 F01c
–110
R
BW
= 3kHz
Figure 1c. Output Noise Spectrum of the LTC3736-1 Spread
Spectrum Buck Switching Converter. Note the Reduction in
Fundamental and Harmonic Peak Spectral Amplitude
Compared to Figure 1a.
FREQUENCY (Hz)
–80
AMPLITUDE (dBm)
–20
–10
–90
–100
–30
–60
–40
–50
–70
37361 F01d
–110
R
BW
= 30Hz
410k 450k 490k 530k 570k 610k
Figure 1d. Zoom-In of Fundamental Frequency of the
LTC3736-1 Spread Spectrum Switching Converter. Note the
>20dB Reduction in Peak Amplitude and Spreading of the
Frequency Spectrum (Between Approximately 450kHz and
580kHz) Compared to Figure 1b.
Output Overvoltage Protection
As a further protection, the overvoltage comparator (OV)
guards against transient overshoots, as well as other more
serious conditions that may overvoltage the output. When
the feedback voltage on the V
FB
pin has risen 13.33%
above the reference voltage of 0.6V, the external P-chan-
nel MOSFET is turned off and the N-channel MOSFET is
turned on until the overvoltage is cleared.
Frequency Selection (FREQ Pin)
(Spread Spectrum Operation Disabled)
The switching frequency of the LTC3736-1 can be selected
using the FREQ pin when spread spectrum operation is
disabled (SSDIS = V
IN
).
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