LTC1265CS#TR

更新时间： 2024-02-26 21:21:57

品牌	Logo	应用领域
凌特 - Linear		转换器
页数	文件大小	规格书
16页	230K
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数据手册

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LTC1265CS#TR 数据手册

LTC1265/LTC1265-3.3/LTC1265-5

W U U

APPLICATIONS INFORMATION

Troubleshooting Hints

When the load currents are low (I_LOAD< I_BURST) Burst

Mode operation occurs. The voltage on C_Tpin now falls to

ground for periods of time as shown in Figure 6b. During

this time the LTC1265 is in sleep mode with quiescent

current reduced to 160µA.

Since efficiency is critical to LTC1265 applications, it is

very important to verify that the circuit is functioning

correctlyinbothcontinuousandBurstModeoperation.As

the LTC1265 is highly tolerant of poor layout, the output

voltage will still be regulated. Therefore, monitoring the

output voltage will not tell you whether you have a good or

bad layout. The waveform to monitor is the voltage on the

timing capacitor Pin 5.

The inductor current should also be monitored. If the

circuit is poorly decoupled, the peak inductor current will

be haphazard as in Figure 7a. A well decoupled LTC1265

has a clean inductor current as in Figure 7b.

IncontinuousmodethevoltageontheC_Tpinisasawtooth

with approximately 0.9V_P-Pswing. This voltage should

never dip below 2V as shown in Figure 6a.

SLEEP MODE

3.3V

2.4V

3.3V

2.4V

TIME

(a) CONTINUOUS MODE OPERATION

(b) Burst Mode OPERATION

LTC1265 F06a

LTC1265 F06b

Figure 6. C_TWaveforms

(b) WELL DECOUPLED LTC1265

(a) POORLY DECOUPLED LTC1265

Figure 7. Inductor Waveforms

1...8 9 101112 13 14...16

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