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

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HA17524P

Switching Regulator Controller

Hitachi -> Renesas Electronics 

HA17524P/FP

Error Amplifier: Figure 2 shows error amplifier biasing, applied input voltage must be set within the range

of common-mode input voltage (1.8 V to 3.4 V). Inserting a resistor and capacitor between phase

compensation terminal (pin 9) and GND in series provides phase compensation.

Current Limiter: The sense amplifier threshold voltage (VS) for the current limiter is:

VS = VBE (Q ) + I1R2 – VBE (Q2)

= I1R2

= 200 mV typ

At the current limiter sense amp shown in figure 6, when V+ – V– 200 mV, Q1 turns on, phase

compensation terminal becomes low and the output switching element is cut off.

Comp

CT

Error

Amp

Q1

Comparator

R1 R2

I1 Q2

(–)C.L. Sense Amp

(+)C.L.

V–

V+

Figure 6 Current Limiter Sense Amplifier

Figure 7 shows an example of detecting current limit. The input voltage range is –0.7 V to +1.0 V; The

current limit detection output is provided from GND line.

E1

E2

HA17524

CL(–)

RS

CL(+)

+VOUT

IOS =

VS

RS

VS = 200 mV

Figure 7 Current Limit Detector Example Operating Waveforms

6

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