HV857L データシートの表示（PDF） - Supertex Inc

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HV857L

Low Noise, High Voltage EL Lamp Driver IC

Supertex Inc 

HV857L

Electrical Characteristics (cont.)

Symbol Parameter

Min Typ Max Units Conditions

IDD

Input current going into the VDD pin

-

-

150 µA VDD = 1.8V to 5.0V. See Figure 1

IIN

Input current including inductor current

-

25 40 mA See Figure 1*

VCS

Output voltage on VCS

-

92

-

V See Figure 1

fEL

EL lamp frequency

175 205 235 Hz See Figure 1

fSW

Switching transistor frequency

65 77 89 kHz See Figure 1

D

Switching transistor duty cycle

-

88

-

% See Figure 1

* The inductor used is a 220µH Murata inductor, max DC resistance of 8.4Ω, part # LQH32CN221K21.

Block Diagram

LX

VDD

CS

RSW-Osc

Switch

Osc

Q

GND

+

VSENSE

VA

C

Disable

_

VREF

Q

High

Voltage

Level

Trans-

VDD

lators

REL-Osc

EL

Osc

Q

VB

Q

Figure 1: Typical Application/ Test Circuit

ON = VDD

OFF = 0V

Enable Signal

+

VDD

-

+

VIN

-

0.1µF

4.7µF

560kΩ

2.0MΩ

1 VDD

VA 8

2 RSW-Osc VB 7

3 REL-Osc CS 6

4 GND

LX 5

HV857LMG

* Murata Inductor

LQH32CN221K21

3

3.0in2 EL lamp

BAS21

220µH*

3.3nF,

100V

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