参数资料
型号: LT1614CS8#TRPBF
厂商: Linear Technology
文件页数: 7/16页
文件大小: 0K
描述: IC REG INV ADJ 0.5A 8SOIC
标准包装: 2,500
类型: 反相
输出类型: 可调式
输出数: 1
输出电压: 可调至 -24V
输入电压: 0.92 V ~ 5 V
PWM 型: 电流模式
频率 - 开关: 600kHz
电流 - 输出: 500mA
同步整流器:
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
供应商设备封装: 8-SOIC
LT1614
OPERATIO
When Q1 turns off during the second phase of switching,
the SWX node voltage abruptly increases to (V IN + |V OUT |).
The SW node voltage increases to V D (about 350mV). Now
current in the first loop, begining at C1, flows through L1,
C2, D1 and back to C1. Current in the second loop flows
from C3 through L2, D1 and back to C3. Load current
continues to be supplied by L2 and C3.
An important layout issue arises due to the chopped
nature of the currents flowing in Q1 and D1. If they are both
tied directly to the ground plane before being combined,
switching noise will be introduced into the ground plane.
It is almost impossible to get rid of this noise, once present
in the ground plane. The solution is to tie D1’s cathode to
the ground pin of the LT1614 before the combined cur-
rents are dumped into the ground plane as drawn in
Figures 4, 5 and 6. This single layout technique can
virtually eliminate high frequency “spike” noise so often
present on switching regulator outputs.
Output ripple voltage appears as a triangular waveform
riding on V OUT . Ripple magnitude equals the ripple current
of L2 multiplied by the equivalent series resistance (ESR)
of output capacitor C3. Increasing the inductance of L1
and L2 lowers the ripple current, which leads to lower
output voltage ripple. Decreasing the ESR of C3, by using
ceramic or other low ESR type capacitors, lowers output
ripple voltage. Output ripple voltage can be reduced to
arbitrarily low levels by using large value inductors and
low ESR, high value capacitors.
V CESAT
–(V IN + ? V OUT ? )
L1
SW
C2
SWX
L2
V IN
–V OUT
+
Q1
D1
C1
C3
R LOAD
1614 F05
Figure 5. Switch-On Phase of Inverting Converter. L1 and L2 Current Have Positive dI/dt
V IN + ? V OUT ? + V D
V D
L1
SW
C2
SWX
L2
V IN
–V OUT
+
Q1
D1
C1
C3
R LOAD
1614 F06
Figure 6. Switch-Off Phase of Inverting Converter. L1 and L2 Current Have Negative dI/dt
7
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