HA17384HRP Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

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HA17384HRP

High Speed Current Mode PWM Control IC for Switching Power Supply

Hitachi -> Renesas Electronics 

HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP

1V

VCS

CS terminal

2R

R

−

CS

+

VCOMP

2VF

COMP terminal

(Error output)

CS

latch

R

S

Q

PWM pulse

Latch setting pulse

(Implemented in triagular

wave oscillator)

Latch setting

pulse

VCOMP

Error voltage

VCS

Current sensing

level

×13

Figure 3 Operation Diagram of Current Sensing Part

Point: 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

B

Heavy load

0.8

0.6

A : Stationary operation / PWM

A

(Current-mode operation)

B : Current limit operation / Max duty cycle

0.4

C : No sensitivity area / No PWM output

Light load

0.2

0.0

0

1.4V

C

4.4V

7.5V

1

2

3

4

5

6

7

8

Error Amplifier Output Voltage Vcomp (V)

Figure 4 Current Sense Characteristics

14

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