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参数资料
| 型号： | LTC3830-1ES8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 95% |
| 电源电压： | 3 V ~ 8 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LTC3830/LTC3830-1
APPLICATIO S I FOR ATIO
Figure 10b shows the Bode plot of the overall transfer
function.
When low ESR output capacitors (Sanyo OS-CON) are
used, the ESR zero can be high enough in frequency that
it provides little phase boost at the loop crossover fre-
quency. As a result, the phase margin becomes inad-
equate and the load transient is not optimized. To resolve
this problem, a small capacitor can be connected between
the top of the resistor divider network and the V FB pin to
create a pole-zero pair in the loop compensation. The zero
location is prior to the pole location and thus, phase lead
can be added to boost the phase margin at the loop
crossover frequency. The pole and zero locations are
located at:
Although a mathematical approach to frequency compen-
sation can be used, the added complication of input and/or
output filters, unknown capacitor ESR, and gross operat-
ing point changes with input voltage, load current varia-
tions, all suggest a more practical empirical method. This
can be done by injecting a transient current at the load and
usinganRCnetworkboxtoiteratetowardthefinalvalues,
or by obtaining the optimum loop response using a
network analyzer to find the actual loop poles and zeros.
Table 2 shows the suggested compensation component
value for 5V to 3.3V applications based on Sanyo OS-CON
4SP820M low ESR output capacitors.
Table 2. Recommended Compensation Network for 5V to 3.3V
Applications Using Multiple Paralleled 820 μ F Sanyo OS-CON
f ZC2 = 1/[2 π (R2)(C2)] and
4SP820M Output Capacitors
L1 ( μ H) C OUT ( μ F) R C (k ? )
C C (nF)
C1 (pF)
C2 (pF)
f PC2 = 1/[2 π (R1||R2)(C2)]
where R1||R2 is the parallel combination resistance of R1
and R2. Choose C2 so that the zero is located at a lower
frequency compared to f CO and the pole location is high
enough that the closed loop has enough phase margin for
stability. Figure 10c shows the Bode plot using phase
lead compensation around the LTC3830 resistor divider
network. Note: This technique is effective only when
1.2
1.2
1.2
2.4
2.4
2.4
4.7
4.7
4.7
1640
2460
4100
1640
2460
4100
1640
2460
4100
6.2
12
12
15
20
36
30
36
82
3.3
3.3
1.8
2.7
1.0
1.0
1.8
1.0
1.0
470
470
220
330
220
220
330
180
180
1000
1000
1000
1000
1000
1000
1000
1000
1000
R1 >> R2 i.e., at high output voltages only so that the pole
and zero are sufficiently separated.
f SW = LTC3830 SWITCHING
f SW = LTC3830 SWITCHING
f Z
FREQUENCY
f CO = CLOSED-LOOP CROSSOVER
FREQUENCY
FREQUENCY
f CO = CLOSED-LOOP CROSSOVER
FREQUENCY
f Z
20dB/DECADE
20dB/DECADE
f CO
f P
f P f PC2
f LC
f ESR
f CO
FREQUENCY
f LC
f ZC2
FREQUENCY
f ESR
3830 F10b
Figure 10b. Bode Plot of the LTC3830 Overall Transfer Function
3830 F10c
Figure 10c. Bode Plot of the LTC3830 Overall
Transfer Function Using a Low ESR Output Capacitor
3830fa
17
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相关代理商/技术参数 |
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| LTC3830EGN | 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3830EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
| LTC3830EGN#TR | 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3830EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3830ES | 功能描述:IC REG CTRLR BUCK PWM VM 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
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