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| 型号： | LTC3853IUJ#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.15 A DUAL SWITCHING CONTROLLER, 830 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, PLASTIC, QFN-40 |
| 文件页数： | 11/36页 |
| 文件大小： | 1780K |
| 代理商： | LTC3853IUJ#TR |
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LTC3853
19
3853fa
Figure 7. Equivalent Input Circuit of Error Amplifier
Figure 5. Two Different Modes of Output Voltage Tracking
Figure 6. Setup for Coincident and Ratiometric Tracking
APPLICATIONS INFORMATION
TIME
(5a) Coincident Tracking
VOUT1
VOUT2
OUTPUT
VOLTAGE
3853 F05a
VOUT1
VOUT2
TIME
3853 F05b
(5b) Ratiometric Tracking
OUTPUT
VOLTAGE
R3
R1
R4
R2
R3
VOUT2
R4
(6a) Coincident Tracking Setup
TO
VFB1
PIN
TO
TK/SS2
PIN
TO
VFB2
PIN
VOUT1
R1
R2
R3
VOUT2
R4
3853 F06
(6b) Ratiometric Tracking Setup
TO
VFB1
PIN
TO
TK/SS2
PIN
TO
VFB2
PIN
VOUT1
–
+
I
D1
TK/SS2
0.8V
VFB2
D2
D3
3853 F07
EA2
is used to match the shifted common mode voltage. The
top two current sources are of the same amplitude. In the
coincident mode, the TK/SS voltage is substantially higher
than 0.8V at steady state and effectively turns off D1. D2
and D3 will therefore conduct the same current and offer
tight matching between VFB2 and the internal precision
0.8V reference. In the ratiometric mode, however, TK/SS
equals 0.8V at steady state. D1 will divert part of the bias
current to make VFB2 slightly lower than 0.8V.
Although this error is minimized by the exponential I-V
characteristic of the diode, it does impose a finite amount
of output voltage deviation. Furthermore, when the master
channel’s output experiences dynamic excursion (under
load transient, for example), the slave channel output will
be affected as well. For better output regulation, use the
coincident tracking mode instead of ratiometric.
INTVCC Regulators and EXTVCC
TheLTC3853featuresanNPNlinearregulatorthatsupplies
power to INTVCC from the VIN supply. INTVCC powers the
gate drivers and much of the LTC3853’s internal circuitry.
The linear regulator regulates the voltage at the INTVCCpin
to 5V when VIN is greater than 6.5V. EXTVCC connects to
INTVCC through a P-channel MOSFET and can supply the
needed power when its voltage is higher than 4.7V. Each
of these can supply a peak current of 150mA and must
be bypassed to ground with a minimum of 1F ceramic
capacitor or low ESR electrolytic capacitor. No matter
what type of bulk capacitor is used, an additional 0.1F
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