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| 型号： | LTC3823IGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-SSOP |
| 标准包装： | 49 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 90% |
| 电源电压： | 4.5 V ~ 36 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： | 28-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1336 (CN2011-ZH PDF) |
LTC3823
APPLICATIONS INFORMATION
TIME
(7a) Coincident Tracking
V OUT1
V OUT2
TIME
(7b) Ratiometric Tracking
3823 F07
V OUT1
V OUT2
Figure 7. Two Different Modes of Output Voltage Tracking
V OUT1
V OUT2
V OUT1
V OUT2
R3
R1
R3
R1
R3
TO
TRACK/SS2
PIN
R4
R2
TO
V FB1
PIN
TO
V FB2
PIN
R4
TO
TRACK/SS2
PIN
R2
TO
V FB1
PIN
TO
V FB2
PIN
R4
3823 F08
(8a) Coincident Tracking Setup
(8b) Ratiometric Tracking Setup
Figure 8. Setup for Coincident and Ratiometric Tracking
there do exist some tradeoffs. The ratiometric mode saves
I
I
a pair of resistors, but the coincident mode offers better
EA2
TRACK/SS2
–
+
D1 D2
3823 F09
0.6V
D3
V FB2
Figure 9. Equivalent Input Current of Error Ampli?er
mode, V OUT1 must be set higher than V OUT2 . To implement
the ratiometric tracking, the ratio of the divider should be
exactly the same as the master IC’s feedback divider. Note
that the pin Z1/SS ENABLE of the slave IC should be tied to
INTV CC so that the internal soft-start current is disabled
in both tracking modes or it will introduce a small error
on the tracking voltage depending on the absolute values
of the tracking resistive divider.
By selecting different resistors, the LTC3823 can achieve
different modes of tracking including the two in Figure 7.
So which mode should be programmed? While either
mode in Figure 7 satis?es most practical applications,
output regulation. This can be better understood with the
help of Figure 9. At the input stage of the slave IC’s error
ampli?er, two common anode diodes are used to clamp
the equivalent reference voltage and an additional diode
is used to match the shifted common mode voltage. The
top two current sources are of the same amplitude. In the
coincident mode, the TRACK/SS voltage is substantially
higher than 0.6V at steady state and effectively turns off
D1. D2 and D3 will therefore conduct the same current
and offer tight matching between V FB2 and the internal
precision 0.6V reference. In the ratiometric mode, however,
TRACK/SS equals 0.6V at steady state. D1 will divert part
of the bias current to make V FB2 slightly lower than 0.6V.
Although this error is minimized by the exponential I-V
characteristic of the diode, it does impose a ?nite amount
of output voltage deviation. Furthermore, when the master
IC’s output experiences dynamic excursion (under load
transient, for example), the slave IC output will be affected
as well. For better output regulation, use the coincident
tracking mode instead of ratiometric .
3823fd
17
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