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參數(shù)資料
| 型號(hào)： | SC1402 |
| 廠商： | Semtech Corporation |
| 英文描述： | Multi-Output, Low-Noise Power Supply Controller for Notebook Computers |
| 中文描述： | 多輸出，低噪聲電源控制器，用于筆記本電腦 |
| 文件頁(yè)數(shù)： | 10/18頁(yè) |
| 文件大?。?/td> | 270K |
| 代理商： | SC1402 |
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SC1402
2000 SEMTECH CORP.
652 MITCHELL ROAD
NEWBURY PARK CA 91320
Multi-Output, Low-Noise Power Supply
Controller for Notebook Computers
December 15, 2000
10
SEQ
RUN/ON3
TIME/ON5
RESET
DESCRIPTION
REF
LOW
LOW
Follows 3.3V SMPS.
Independent start control mode.
Both SMPSs off.
REF
LOW
HIGH
Low.
5V SMPS ON, 3.3V SMPS OFF.
REF
HIGH
LOW
Follows 3.3V SMPS.
3.3V SMPS ON, 5V SMPS OFF.
REF
HIGH
HIGH
Follows 3.3V SMPS.
Both SMPSs on.
GND
LOW
TIMING CAP
Low.
Both SMPS off.
GND
HIGH
TIMING CAP
High after both outputs
are in regulation.
5V starts on rising edge of RUN/ON3, 3V
starts when TIME/ON5 > REF.
VL
LOW
TIMING CAP
Low.
Both SMPS off.
VL
HIGH
TIMING CAP
High after both outputs
are in regulation.
3.3V starts on rising edge of RUN/ON3,
5V starts when TIME/ON5 > REF.
inductor.
A heavy load on the 12OUT regulator when the 5V
SMPS is in PSAVE will cause the VDD input to drop,
browning out the regulator. If the output drops 0.8%
from its nominal value, the 5V SMPS is forced out of
PSAVE mode and into continuous conduction mode for
8 cycles. This recharges the bulk input capacitor on
VDD. The 12OUT linear regulator has a current limit to
prevent damage under short circuit conditions.
Over-voltage protection is provided on the VDD input.
If the VDD input is above 19V, an over-voltage is de-
tected and a 10mA current shunt load is applied to
VDD. The over-voltage threshold has 0.5V of hystere-
sis.
Power up Controls and Soft Start
The user has control of the SC1402 startup sequence
by setting the SEQ, RUN/ON3 and TIME/ON5 pins as
described in the following table.
Each SMPS contains its own counter and DAC to grad-
ually increase the current limit at startup to prevent in-
put surge currents. The current limit is increased from
0, 20%, 40%, 60%, 80%, to 100% linearly over the
course of 512 switching cycles.
A RESET output is also generated at startup. The
RESET pin is held low for 32K switching cycles. An-
other timer is used to enable the undervoltage protec-
tion. The undervoltage protection circuitry is enabled
after 6144 switching cycles at which time the SMPS
should be in regulation.
When SEQ is set to REF, the RESET only monitors
the 3.3V SMPS in regulation. The 5V SMPS is ignored.
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相關(guān)代理商/技術(shù)參數(shù) |
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| SC1402ISS | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Multi-Output, Low-Noise Power Supply Controller for Notebook Computers |
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| SC1403_04 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Mobile Multi-Output PWM Controller with Lossless Current Sense |
| SC1403ITSTR | 制造商:Semtech Corporation 功能描述:IC, MULTI-OUTPUT PWM CONTROLLER, 28-TSSOP, Primary Input Voltage:15V, No. of Out |
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