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參數資料
| 型號： | STR-S84145 |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| 中文描述： | 250 的低電流運算，低反向泄露，低噪聲穩(wěn)壓二極管 |
| 文件頁數： | 1/8頁 |
| 文件大?。?/td> | 104K |
| 代理商： | STR-S84145 |
STR83145 and STR84145
LATCHED, UNIVERSAL INPUT-VOLTAGE SWITCHES
August 16, 1994
D
2
Intended for power supplies with universal inputs (85 V to 265 V
rms), the STR83145 and STR84145 latched, universal input-voltage
switches incorporate timing, control, and drive circuitry with a high-
current triac (bidirectional triode thyristor) switch. Each device senses
the applied ac line potential and automatically switches the rectifier and
associated capacitors between a voltage-doubler configuration (for line
voltages to 141 V) and a full-bridge configuration (for line voltages
greater than 149 V). This eliminates the possibility of user error with
adjustable jumpers or switches. Also, the related switch-mode power
stage need operate only over a reduced range of dc input voltages
when compared with "wide input" power supplies using a bridge rectifier
only. The reduction in dc input voltage range permits the use of lower-
voltage capacitors and leads to a reduction in power stage stresses and
power dissipation. The STR83145 and STR84145 differ only in their
maximum ac current rating (10 A and 12 A, respectively).
The internal sensitive-gate triac is switched by a temperature-
compensated constant-current gate driver driven by a 15 kHz pulse
train to reduce power dissipation. The switch-over voltage is accurately
set during manufacture for consistent operation. An user-adjustable
delay is provided to ensure start-up in the full-bridge mode. Once
established (by an input voltage greater than 149 V rms), an integral
latch holds the full-bridge mode to preclude false application of the
doubler mode during brownouts, voltage droops, or missing cycles.
The requirements of low transient thermal impedance and steady-
state thermal resistance are satisfied in a molded, 5-lead single in-line
power package. Similar input-voltage switches, with a switch point of
159 V rms, are also available.
FEATURES
I
Low Duty Cycle Triac Drive for Minimum Dissipation
I
For Universal Input Operation Between 85 V rms and 265 V rms
to 10 A or 12 A
I
Internal Latch Prevents False Mode Switching
I
Internal Sensitive-Gate Power Triac
I
Adjustable Start-Up Delay
I
Accurate 145 V rms Switch-Point Voltage
I
Low External Parts Count
I
Low Power Dissipation
I
Low-Power External Parts
Always order by complete part number:
Part Number
Max. On-State Current
STR83145
10 A rms
STR84145
12 A rms
A
LATCHED, UNIVERSAL
INPUT-VOLTAGE SWITCHES
STR84145
ABSOLUTE MAXIMUM RATINGS
Repetitive Peak OFF-State Voltage,
V
DRM
.............................................
500 V
Static ON-State Current, I
STR83145......................................
10 A
STR84145......................................
12 A
Non-Repetitive Surge ON-State Current, I
STR83145....................................
100 A
STR84145....................................
120 A
Package Power Dissipation,
P
D
........................................
See Graph
Triac Junction Temperature, T
J
.....
+125
°
C
Frame Temperature, T
M
................
+100
°
C
Operating Temperature Range,
T
A
...............................
-20
°
C to +125
°
C
Storage Temperature Range,
T
stg
.............................
-40
°
C to +125
°
C
M
D
C
M
Dwg. PK-005
G
1
2
3
4
5
L
+
O
TM
McroSystems, Inc.
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