RT34063APS 查看數據表（PDF） - Richtek Technology

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RT34063APS

DC-to-DC Converter Control Circuits

Richtek Technology 

8

7

VIN

6

5

RT34063A

1

VOUT

2

3

4

(a) External NPN Switch

8

7

VIN

6

5

R

1

2

3

4

VOUT

R 0 for

Constant VIN

(b) External NPN Saturated Switch (See Note)

Figure 2. External Current Boost Connections for IC Peak Greater than 1.5A

Note: If the output switch is driven into hard saturation (non-Darlington configuration) at low switch current≤s ( 300mA) and

high driver curren≥ts ( 30mA), it may take up to 2.0μs to come out of saturation. This condition will shorten the off time at

frequencies ≥ 30kHz, and is magnified at high temperature. This condition does not occur with a Darlington configuration,

since the output switch cannot saturate. If a non-Darlington configuration is used, the following output drive condition is

recommended.

DS34063A-13 March 2007

www.richtek.com

3

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