參數(shù)資料
型號: MAX1999
廠商: Maxim Integrated Products, Inc.
英文描述: High-Efficiency, Quad Output, Main Power- Supply Controllers for Notebook Computers
中文描述: 高效率、四路輸出、主電源控制器,用于筆記本電腦
文件頁數(shù): 17/32頁
文件大小: 497K
代理商: MAX1999
M
High-Effic ienc y, Quad Output, Main Power-
S upply Controllers for Notebook Computers
______________________________________________________________________________________
17
Each PWM controller consists of a Dual Mode feedback
network and multiplexer, a multi-input PWM comparator,
high-side and low-side gate drivers, and logic. The
MAX1777/MAX1977/MAX1999 contain fault-protection cir-
cuits that monitor the main PWM outputs for undervoltage
and overvoltage conditions. A power-on sequence block
controls the power-up timing of the main PWMs and moni-
tors the outputs for undervoltage faults. The
MAX1777/MAX1977/MAX1999 include 5V and 3.3V linear
regulators. Bias generator blocks include the 5V (LDO5)
linear regulator, 2V precision reference, and automatic
bootstrap switchover circuit.
ON-TIME
COMPUTE
t
ON
t
OFF
TRIG
TRIG
ONE SHOT
ONE SHOT
Q
Q
Q
R
S
ERROR
AMPLIFIER
CURRENT
LIMIT
ZERO
CROSSING
Q
R
S
FAULT
LATCH
20ms
BLANKING
OUT
REF
ILIM_
CS_ (MAX1777/1977)
LX_ (MAX1999)
SKIP
OUT_
FB_
0.15V
PRO
0.9
V
REF
1.1
V
REF
0.7
V
REF
OV_FAULT
UV_FAULT
PGOOD
TODL_ DRIVER
TODH_ DRIVER
Σ
TON (MAX1999)
V+
Figure 4. PWM Controller (One Side Only)
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