参数资料
型号: LTC3736EGN-1#TR
厂商: Linear Technology
文件页数: 11/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 24-SSOP
标准包装: 2,500
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 825kHz
占空比: 100%
电源电压: 2.75 V ~ 9.8 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 24-SSOP(0.154",3.90mm 宽)
包装: 带卷 (TR)
LTC3736-1
OPERATIO
(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.
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 ).
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
R BW = 3kHz
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
R BW = 30Hz
0
6M
12M 18M
24M
30M
410k
450k
490k 530k
570k
610k
FREQUENCY (Hz)
37361 F01a
Figure 1a. Output Noise Spectrum of Conventional Buck
Switching Converter (LTC3736-1 with Spread Spectrum
Disabled) Showing Fundamental and Harmonic Frequencies
FREQUENCY (Hz)
37361 F01b
Figure 1b. Zoom-In of Fundamental Frequency of Conventional
Buck Switching Converter
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
R BW = 3kHz
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
R BW = 30Hz
0
6M
12M 18M
24M
30M
410k
450k
490k 530k
570k
610k
FREQUENCY (Hz)
37361 F01c
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)
37361 F01d
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.
37361f
11
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