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

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HA17524P

Switching Regulator Controller

Hitachi -> Renesas Electronics 

HA17524P/FP

Q1

6

I

RT

VREF

Q2

Q3

Discharge

7

I CT

VH

∆V

T

VL

CT Terminal Waveform

I ≈ VREF – VEB (Q2) – VEB (Q3)

RT

∆V = VH – VL ≅ 3.8 – 0.9 = 2.9 V

1

T ≈ CT · ∆V · I

Figure 4 Oscillating Circuit and CT Terminal Waveform

The oscillator output pulse signal is used as the flip flop clock pulse and as switching pulses for the output

transistors, synchronous to the clock pulse.

The pulse-widths which can be controlled by the timing capacitor CT as shown in figure 5, increases output

dead time.

10

VCC = 20 V

RT = 10 kΩ

Ta = 25°C

3

1.0

0.3

0.1

0.001 0.003

0.01

0.03

0.1

Timing Capacitance CT (µF)

Figure 5 Dead Time vs Timing Capacitance

Reference Voltage: The built-in regulator (reference voltage: VREF = 5 ±0.4 V) can be used as a reference

power supply for the error amplifier, which determines output voltage (VOUT). It is also connected as a bias

source for another circuits in IC.

5

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