MAX8595XETA(2004) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8595XETA
(Rev.:2004)

High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDs

Maxim Integrated 

High-Efficiency, 36V Step-Up Converters

with TA Derating Option for 2 to 9 White LEDs

Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN = 3.6V, ILED = 25mA, L = 22µH, CIN = 2.2µF, COUT = 0.1µF, CCOMP = 0.1µF, RSENSE = 13Ω, 4 LEDs, TA = +25°C,

unless otherwise noted.)

VCTRL

IIN

ILED

VOUT

CTRL STEP RESPONSE

MAX8595X toc07

1V/div

0

100mA/div

0

20ms/div

40mA/div

0

10V/div

0

VCTRL

VIN

VOUT

ILED

DIRECT-PWM DIMMING RESPONSE

MAX8595X toc08

2V/div

32kHz 50%

DUTY CYCLE

0

20mV/div

AC-COUPLED

0

500mV/div

AC-COUPLED

0

10µs/div

10mA/div

0

Pin Description

PIN

NAME

FUNCTION

Overvoltage Sense. When VOUT is greater than 38V (typ), the internal n-channel MOSFET turns off

1

OUT

until VOUT drops below 36V (typ), then the IC reenters soft-start. Connect a 0.1µF ceramic capacitor

from OUT to ground. In shutdown, VOUT is one diode drop below VIN.

2

IN

Input Voltage Supply. The input voltage range is 2.6V to 5.5V. Connect a 2.2µF ceramic capacitor

from IN to GND.

Brightness Control Input. The voltage applied to CTRL controls LED brightness. Varying the voltage

from 0.24V to 1.65V (1.72V for the MAX8596X) adjusts the brightness from dim to 100% brightness,

3

CTRL

respectively. Any voltage above 1.65V (1.72V) does not increase brightness. Hold CTRL below

100mV to shut down the IC after an 8.2ms delay.

4

CS

Current-Sense Feedback Input. Connect a resistor from CS to GND to set the LED bias current. The

voltage at CS regulates to VCTRL / 5 or 0.330V (0.343V for the MAX8596X), whichever is lower.

Compensation Input. Connect a 0.1µF ceramic capacitor (CCOMP) from COMP to GND. CCOMP

5

COMP stabilizes the converter, controls soft-start, and lowpass filters direct PWM dimming at CTRL. CCOMP

discharges to 0V through an internal 20kΩ resistor in shutdown.

6

GND

Ground. Connect to PGND and the exposed pad directly under the IC.

7

PGND Power Ground. Connect to GND and the exposed pad directly under the IC.

8

LX

Inductor Connection. Connect LX to the node between the inductor and the Schottky diode. LX is

high impedance in shutdown.

—

EP

Exposed Pad. Connect to a large ground plane for maximum package heat dissipation. Connect

directly to GND and PGND under the IC.

_______________________________________________________________________________________ 5

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