HA17524P Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

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HA17524P

Switching Regulator Controller

Hitachi -> Renesas Electronics 

HA17524P/FP

Blocks Description

Oscillator: The oscillation frequency f is calculated from the following equations. Figure 3 shows one

example.

f 1.15/(RT •CT)

RT = 1.8k to 100 k Ω

CT = 0.001µ to 0.1 µF

f = 140 Hz to 500 kHz

1M

400 k

100 k

40 k

10 k

4k

1k

400

VCC = 20 V

Ta = 25°C

C

T = 0.001 µF

C

T = 0.01 µF

C

T = 0.1 µF

100

1k

4 k 10 k 40 k 100 k

Timing Resistance RT ( Ω)

Figure 3 Oscillating Frequency vs Timing Resistance

Then the ramp wave shown in figure 4 is available at pin 7, CT terminal, since CT is charged by the constant

current I generated by RT.

4

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