- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄378083 > PT6985N (Texas Instruments, Inc.) Isolated Flyback Switching Regulator with 9V Output PDF資料下載
參數(shù)資料
| 型號(hào)： | PT6985N |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | 隔離反激式開關(guān)穩(wěn)壓9V輸出 |
| 文件頁(yè)數(shù)： | 11/13頁(yè) |
| 文件大小： | 293K |
| 代理商： | PT6985N |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)當(dāng)前第11頁(yè)第12頁(yè)第13頁(yè)
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT6980 Series
Using the Standby Function on the PT6980
Series of Dual-Output Voltage Regulators
Both output voltages of the 23-pin PT6980 dual-output
converter may be disabled using the regulator’s ‘Standby’
function. This function may be used in applications that
require power-up/shutdown sequencing, or wherever there
is a requirement to control the output voltage On/Off status
with external circuitry.
The standby function is provided by the
STBY*
control
(pin 3). If pin 3 is left open-circuit the regulator operates
normally, and provides a regulated output at both Vo
1
(pins
12–15) and Vo
2
(pins 18–21) whenever a valid supply volt-
age is applied to V
in
(pins 4, 5, & 6) with respect to GND
(pins 7-11). If a low voltage
1
is then applied to pin-3 both
regulator outputs will be simultaneously disabled and the
input current drawn by the ISR will drop to a typical value
of 4mA. The standby control may also be used to hold-off
both regulator outputs during the period that input power is
applied.
The standby pin is ideally controlled using an open-collector
(or open-drain) discrete transistor (See Figure 1). The
open-circuit voltage is the input voltage +V
in
. Table 1 gives
the circuit parameters for this control input.
Table 1 Standby Control Parameters
1, 2
Parameter
Enable (V
IH
)
Disable (V
IL
)
V
STBY
(open circuit)
I
STBY
(I
IL
)
Min
—
–0.1V
—
—
TYP
—
—
+V
in
2
—
Max
Open circuit
0.4V
1
—
–0.5mA
Notes:
1. The standby control input is
Not
compatible with TTL or
other devices that incorporate a totem-pole output drive. Use
only a true open-collector device, preferably a discrete bipolar
transistor (or MOSFET). To ensure the regulator output is
disabled, the control pin must be pulled to less than 0.4Vdc
with a low-level 0.5mA sink to ground.
2 The standby control input requires no external pull-up resistor.
The open-circuit voltage of the STBY* pin is the input
voltage +V
in
.
3. When the regulator output is disabled the current drawn from
the input source is typically reduced to 4mA.
Figure 1
Turn-On Time:
Turning Q
1
in Figure 1 off removes the low-
voltage signal at pin 3 and enables the PT6980 series
regulator. Following a delay of about 25ms, Vo
1
and Vo
2
rise together until the lower voltage, Vo
2
, reaches its set
output. Vo
1
continues to rise until both outputs reach full
regulation voltage. The total power-up time is less than
40ms, and is relatively independent of load, temperature,
and output capacitance. Figure 2 shows waveforms of the
output voltages, Vo
1
and Vo
2
, for a PT6984 (3.3V/1.2V).
The turn-off of Q
1
corresponds to the rise in V
STBY
. The
waveforms were measured with a 12V input voltage, and
with resistive loads of 5A and 1.25A at the Vo
1
and Vo
2
outputs respectively.
Figure 2
C
1
+
C
2
+
Inhibit
V
in
Vo
2
COM
COM
Q1
BSS138
Vo
1
C
3
+
4, 5, 6
PT6984
18–21
23
7–11
V
IN
2
GND
V
2
(adj)
V
1
(sns)
1
16
V
1
(adj)
12–15
Vo
1
V
2
(sns)
22
STBY
3
V1 (1V/Div)
V2 (1V/Div)
HORIZ SCALE: 5ms/Div
Vstby (10V/Div)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PT6981A | Isolated Flyback Switching Regulator with 9V Output |
| PT6981C | Isolated Flyback Switching Regulator with 9V Output |
| PT7600 | 10A Programmable ISR Family |
| PT7681N | 30-A Programmable ISR With Margin Up/Down Controls |
| PT7702A | 15 AMP HIGH-PERFORMANCE BIG HAMMER PROGRAMMABLE ISR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT6999 | 制造商:PTC 制造商全稱:Princeton Technology Corp 功能描述:Output Expander |
| PT6CGCA12-14-19P-025 | 功能描述:PT 19C 19#16 PIN PLUG 制造商:amphenol industrial operations 系列:* 零件狀態(tài):有效 標(biāo)準(zhǔn)包裝:1 |
| PT6CGCA12-14-19P-027 | 功能描述:PT 19C 19#16 PIN PLUG 制造商:amphenol industrial operations 系列:* 零件狀態(tài):有效 標(biāo)準(zhǔn)包裝:1 |
| PT6CGML1-8-2S | 制造商:Amphenol Corporation 功能描述:CIRCULAR SIZE 8 2WAY SKT 制造商:Amphenol Aerospace 功能描述:CIRCULAR, SIZE 8, 2WAY, SKT |
| PT6E | 制造商:OEP (OXFORD ELECTRICAL PRODUCTS) 功能描述:TRANSFORMER PULSE ENCAPS 1:1+ 制造商:OEP (OXFORD ELECTRICAL PRODUCTS) 功能描述:TRANSFORMER, PULSE, ENCAPS, 1:1+ 制造商:OEP (OXFORD ELECTRICAL PRODUCTS) 功能描述:TRANSFORMER, PULSE, ENCAPS, 1:1+; Inductance:8H; DC Resistance:1.4ohm; ET Constant:200V/s; Isolation Voltage:2.8kV; Turns Ratio:1:1+1; SVHC:No SVHC (19-Dec-2012); Capacitance:30pF; ET constant:200Vsec; External Depth:15mm; ;RoHS Compliant: Yes |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。