FSDH0265RN_05 FAIRCHILD [Fairchild Semiconductor], FSDH0265RN_05 Datasheet - Page 12

• Manufacturer Part Number: FSDH0265RN_05
• Description: Green Mode Fairchild Power Switch (FPSTM)
• Manufacturer: FAIRCHILD [Fairchild Semiconductor]

FSDH0265RN, FSDM0265RN
Figure 12. FSDX-series FPS Full Range EMI Scan (67KHz,
12
Figure 11. KA5-series FPS Full Range EMI scan(67KHz,
with Frequency Modulation) with DVD Player SET
no Frequency Modulation) with DVD Player SET
Frequency (MHz)
Frequency (MHz)
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.
For example, FSDx0265RN has a typical Sense FET peak
current limit (I
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)
Rx
Figure 13. Peak Current Limit Adjustment
Vfb
Ipk
3
4
LIM
I
DELAY
Vcc
) of 1.5A. I
5uA
I
FB
Vcc
900uA
LIM
can be adjusted to 1A by
0.8k
2k
Ω
Ω
Comparator
PWM
SenseFET
Current
Sense