Datasheet > AA1700

AA1700

更新时间： 2022-12-20 00:54:36

品牌	Logo	应用领域
宏海微 - AGAMEM		驱动器
页数	文件大小	规格书
10页	228K
描述
Constant Current White LED driver

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AA1700 数据手册

AA1700

Agamem Microelectronics Inc.

PRELIMINARY

Constant Current White LED driver

(Continued)

Value

Parameter

Symbol

Condition

Unit

Min

Typ

Max

RB = 390 Ω , IO = –15 mA

V^OH1

V^OH2

V^OL1

V^OL2

1.0

1.2

—

RB = 750 Ω , VCC = 1.8 V

I^O= –10 mA

0.8

—

1.0

0.1

—

Output voltage

RB = 390 Ω , IO = 15 mA

0.2

Output section

RB = 750 Ω , VCC = 1.8 V

I^O= 10 mA

—

Output source

current

I^O+

RB = 390 Ω , VO = 0.9 V

—

–30

–20 mA

Output sink current

Pull down resistance

Pin voltage

IO –

R^O

RB = 390 Ω , VO = 0.3 V

0.3

—

0.4

kΩ

—

VCTL

IOFF

I^ON

RB = 390 Ω

0.2

–20

—

Output current

setting section/

Control section

Input off condition

Input on condition

Pin current range

Stand-by current

µ A

—

–45 µ A

—

I^CTL

ICCS

–1.8

—

–0.1 mA

CTL pin open or VCC

—

µ A

Entire device

Average supply

current

I^CC

RB = 390 Ω

—

5.5

9.3

■HOW TO SET THE TIME CONSTANT FOR SOFT START AND SHORT CIRCUIT DETECTION

1. Soft Start

A soft start function, which gradually increases the width of the output pulses at power on, will be applied if a

capacitor is connected to the SP pin. This can prevent rush currents and overshoot when the power supply is

turned on.

Soft start time can be measured by the following equation. (The time until the output ON duty reaches

approximately 50%)

t^S[s] = 0.35 × CPE [uF]

2. Timer Latch Short Circuit Protection

When the load conditions suddenly change due to load effect, the short-circuit protection comparator outputs the

high-level signal (V_OM⁺) and the capacitor C_PEconnected to the SP terminal starts charging. When the external

capacitor C_PEhas been charged to approximately 0.8V, the latch circuit is set, the output terminal is fixed to low

level, and the dead-time is set to 100%. However, the latch circuit is not reset unless the power for the latch

circuit is turned off or restarted by the on/off control.

• Short circuit detection time

t^PE[s] = 0.8 × CPE [uF]

©Copyright Agamem Microelectronics Inc.

www.agamem.com.tw

2007/1/22

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