MAX5095BAUA 데이터 시트보기 (PDF) - Maxim Integrated
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MAX5095BAUA Datasheet PDF : 22 Pages
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High-Performance, Single-Ended, Current-Mode
PWM Controllers
MAX5094_
CS 3
GND 5
VEA
FB 2
COMP 1
2.5V
REFERENCE
2.5V
2.5V
PREREGULATOR
5V
VP
UVLO 8.4V/7.6V
THERMAL
SHUTDOWN
VOLTAGE-
DIVIDER
7 VCC
26.5V
EN-DRV-BAR
DELAY
REG_OK VP
EN-REF VDD
BG 5V REGULATOR
SNS
VOLTAGE-
DIVIDER
8 REF
1V (MAX5094A/B)
0.3V (MAX5094C/D)
ILIM
CPWM
2R
R
CLK
OSC Q
SQ
R
6 OUT
4 RT/CT
100% MAX DUTY CYCLE (MAX5094A/MAX5094C)
50% MAX DUTY CYCLE (MAX5094B/MAX5094D)
Figure 1. MAX5094_ Functional Diagram
Detailed Description
The MAX5094_/MAX5095_ current-mode PWM con-
trollers are designed for use as the control and regulation
core of flyback or forward topology switching power sup-
plies. These devices incorporate an integrated low-side
driver, adjustable oscillator, error amplifier (MAX5094_
only), current-sense amplifier, 5V reference, and external
synchronization capability (MAX5095A/MAX5095B only).
An internal +26.5V current-limited VCC clamp prevents
overvoltage during startup.
Eight different versions of the MAX5094/MAX5095 are
available as shown in the Selector Guide. The
MAX5094A/MAX5094B are the standard versions with a
feedback input (FB) and internal error amplifier. The
MAX5095A/MAX5095B include bidirectional synchroniza-
tion (SYNC). This enables multiple MAX5095A/
MAX5095Bs to be connected and synchronized to the
device with the highest frequency. The MAX5095C
includes an ADV_CLK output, which precedes the
MAX5095C’s drive output (OUT) by 110ns. Figures 1, 2,
and 3 show the internal functional diagrams of the
MAX5094_, MAX5095A/MAX5095B, and MAX5095C,
respectively. The MAX5094A/MAX5094C/MAX5095A are
capable of 100% maximum duty cycle. The MAX5094B/
MAX5094D/MAX5095B/MAX5095C limit the maximum
duty cycle to 50%.
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