HA17384HPS datasheet(13/29 Pages) RENESAS

Part #	HA17384HPS

Description	High Speed Current Mode PWM Control IC for Switching Power Supply

PDF	29 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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13 / 29 page

HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP

Rev.3.00 Jun 15, 2005 page 13 of 28

VCOMP

COMP terminal

(Error output)

PWM pulse

Latch setting pulse

(Implemented in triagular

wave oscillator)

Latch setting

pulse

VCOMP

Error voltage

VCS

Current sensing

level

1 V

VCS

CS terminal

2 R

2VF

× 1

−

latch

Figure 3 Operation Diagram of Current Sensing Part

Point:

Error Amplifier Output Voltage Vcomp (V)

Light load

Heavy load

1) At maximum rated load, the setting should be made to give

approximately 90% of area A below.

2) When the OVP latch is operated, the setting should be made

in area B or C.

1.0

0.8

0.6

0.4

0.2

0.0

012345678

1.4V

4.4V

7.5V

A : Stationary operation / PWM

(Current-mode operation)

B : Current limit operation / Max duty cycle

C : No sensitivity area / No PWM output

Figure 4 Current Sense Characteristics

HA17384HPS Datasheet(PDF) 13 Page - Renesas Technology Corp

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