参数资料
型号: LT3437EFE#PBF
厂商: Linear Technology
文件页数: 24/28页
文件大小: 0K
描述: IC REG BUCK ADJ 0.5A 16TSSOP
标准包装: 95
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 1.25 V ~ 54 V
输入电压: 3.3 V ~ 60 V
PWM 型: 电流模式,混合
频率 - 开关: 200kHz
电流 - 输出: 500mA
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm)裸露焊盘
包装: 管件
供应商设备封装: 16-TSSOP-EP
LT3437
APPLICATIO S I FOR ATIO
A zero can be added into the loop by placing a resistor (R C )
at the V C pin in series with the compensation capacitor, C C ,
or by placing a capacitor (C FB ) between the output and the
FB pin.
When using R C , the maximum value has two limitations.
First, the combination of output capacitor ESR and R C may
stop the loop rolling off altogether. Second, if the loop gain
is not rolled off sufficiently at the switching frequency,
output ripple will perturb the V C pin enough to cause
unstable duty cycle switching, similar to subharmonic
oscillations. If needed, an additional capacitor (C F ) can be
added across the R C /C C network from the V C pin to ground
to further suppress V C ripple voltage.
With a tantalum output capacitor, the LT3437 already
includes a resistor (R C ) and filter capacitor (C F ) at the V C
pin (see Figures 10 and 11) to compensate the loop over
the entire V IN range (to allow for stable pulse skipping for
high V IN -to-V OUT ratios ≥ 10). A ceramic output capacitor
can still be used with a simple adjustment to the resistor R C
for stable operation (see Ceramic Capacitors section for
stabilizing LT3430). If additional phase margin is required,
a capacitor (C FB ) can be inserted between the output and
FB pin, but care must be taken for high output voltage
applications. Sudden shorts to the output can create
unacceptably large negative transients on the FB pin.
For V IN -to-V OUT ratios < 10, higher loop bandwidths are
possible by readjusting the frequency compensation com-
ponents at the V C pin.
When checking loop stability, the circuit should be oper-
ated over the application’s full voltage, current and tem-
perature range. Proper loop compensation may be obtained
by empirical methods, as described in Application Notes
19 and 76.
I LOAD = 250mA
LT3437
CURRENT MODE
POWER STAGE
g m = 1
g m = 650 μ
V C
ERROR
SW
FB
R1
C FB
OUTPUT
100
80
60
40
20
0
V OUT = 3.3V
C OUT = 100 μ F, 0.1 ? –20
C F = 330pF
R C = 25k –40
C C = 1500pF
–60
–80
–100
R C
C C
C F
1.6M
AMP
+
1.25V
R2
ESR
C OUT
0
–20
–120
–140
–160
–40
–180
3437 F13
10
100
1k 10k
100k
1M
FREQUENCY (Hz)
3437 F12
Figure 10. Model for Loop Response
Figure 11. Overall Loop Response
3437fc
24
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