参数资料
型号: LT1611CS5#TRM
厂商: Linear Technology
文件页数: 6/12页
文件大小: 0K
描述: IC REG INV ADJ 0.3A SOT23-5
标准包装: 1
类型: 反相
输出类型: 可调式
输出数: 1
输出电压: -0.9 V ~ -10 V
输入电压: 0.9 V ~ 10 V
PWM 型: 电流模式
频率 - 开关: 1.4MHz
电流 - 输出: 300mA
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: SC-74A,SOT-753
包装: 剪切带 (CT)
供应商设备封装: SOT-23-5
其它名称: LT1611CS5
LT1611CS5#TRMCT
LT1611CS5-ND
LT1611
OPERATIO
V CESAT
–(V IN + ? V OUT ? )
L1
SW
C2
SWX
L2
V IN
–V OUT
+
Q1
D1
C1
C3
R LOAD
1611 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
1611 F06
Figure 6. Switch-Off Phase of Inverting Converter. L1 and L2 Current Have Negative dI/dt
Transient Response
The inverting architecture of the LT1611 can generate a
very low ripple output voltage. Recently available high
value ceramic capacitors can be used successfully in
LT1611 designs with the addition of a phase lead capaci-
tor, C PL (see Figure 7). Connected in parallel with feedback
resistor R1, this capacitor reduces both output perturba-
6
tions due to load steps and output ripple voltage to very
low levels. To illustrate, Figure 7 shows an LT1611 invert-
ing converter with resistor loads R L1 and R L2 . R L1 is
connected across the output, while R L2 is switched in
externally via a pulse generator. Output voltage wave-
forms are pictured in subsequent figures, illustrating the
performance of output capacitor type and the effect of C PL
connected across R1.
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