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參數(shù)資料
| 型號： | AT5801 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 4-Channel driver + Power Controller |
| 中文描述： | 4通道驅(qū)動器電源控制器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 276K |
| 代理商： | AT5801 |
AT5801
Preliminary
4-Channel driver + Power Controller
10F-1, No.55, Tung Kuang Road, Hsinchu, Taiwan, R.O.C. Email:
service@aimtron.com.tw
Tel: 886-3-575-3058
http://www.aimtron.com.tw
Fax: 886-3-575-3015 01/08/05
10
2.Short-circuit protection function
When the output of error amplifier is “H”, if
the voltage of SPRT terminal has reached
1.2V(typ.) upon charging the terminal,
switching of SW terminal is disabled. Time to
disable switching depends on a capacitor of
the SPRT terminal and it can be calculated by
the under-mentioned expression:
3.Soft-start function
The soft-start is functioned by putting a
capacitor between DEAD terminal and GND.
Max duty can be changed by attaching
resistance to 4-pin.
4.Power-off operation
SPRT terminal is charged by setting OFF
terminal to “L”. Then, switching of SW
terminal is terminated when the voltage of the
SPRT terminal has reached 1.2V(typ.). Time
to disable switching depends on a capacitor of
the SPRT terminal and it can be calculated by
the under-mentioned expression:
5.Over-voltage protection operation
When the voltage impressed to BSEN terminal
has been 8.4V(typ.), SPRT terminal is charged.
Then, switching of SW terminal is terminated
when the voltage of the SPRT terminal has
reached 1.2V(typ.). Time to disable switching
depends on a capacitor of the SPRT terminal
and it can be calculated by the under-
mentioned expression:
〈
PWM power supply drive circuit
〉
This circuit detects a maximum output level of
drivers of four channels and performs the
PWM supply of load drive power supply. This
circuit uses PNP transistor, Schottky Diode
and Capacitor as external component.
〈
“Empty” detector unit
〉
When the voltage impressed to BSEN terminal
has been the detecting voltage or less, EMP
terminal varies from “H” to “L”(open collector
output). Hysteresis of 50mV(typ.) set to the
detecting voltage to prevent the output chattering.
The detecting voltage varies depending on SEL
terminal as follows:
)
10
,
20
.
(
(sec)
A
ISPRT
V
VTH
ISPRT
VTH
CSPRT
t
μ
=
=
×
=
)
65
(
(sec)
=
×
=
R
K
R
CDEAD
t
)
20
,
20
.
(
(sec)
A
IOFF
V
VTH
IOFF
VTH
CSPRT
t
μ
=
=
×
=
)
20
,
20
.
(
(sec)
A
IHV
V
VTH
IHV
VTH
CSPRT
t
μ
=
=
×
=
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