DM0265RN View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

Manufacturer

DM0265RN

DMO265R = DM0265R FAIRCHILD / FSDH0265RN, FSDM0265RN

Fairchild Semiconductor 

FSDH0265RN, FSDM0265RN

8. Adjusting Peak Current Limit : As shown in Figure 13,

a combined 2.8kΩ internal resistance is connected to the

non-inverting lead on the PWM comparator. A external

resistance of Rx on the current limit pin forms a parallel

resistance with the 2.8kΩ when the internal diodes are

biased by the main current source of 900uA.

Frequency (MHz)

Figure 11. KA5-series FPS Full Range EMI scan(67KHz,

no Frequency Modulation) with DVD Player SET

Vcc

Vcc

Vfb IDELAY

3

5uA

IFB

900uA

2kΩ

Ipk

4

0.8kΩ

Rx

PWM

Comparator

SenseFET

Current

Sense

Figure 13. Peak Current Limit Adjustment

For example, FSDx0265RN has a typical Sense FET peak

current limit (ILIM) of 1.5A. ILIM can be adjusted to 1A by

inserting Rx between the Ipk pin and the ground. The value

of the Rx can be estimated by the following equations:

1.5A : 1A = 2.8kΩ : XkΩ ,

X = Rx || 2.8kΩ .

(X represents the resistance of the parallel network)

Frequency (MHz)

Figure 12. FSDX-series FPS Full Range EMI Scan (67KHz,

with Frequency Modulation) with DVD Player SET

12

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