MAX5094DAUA Maxim Integrated Products, MAX5094DAUA Datasheet - Page 12

• Manufacturer Part Number: MAX5094DAUA
• Description: Current Mode PWM Controllers Single-Ended
• Manufacturer: Maxim Integrated Products

The advantages of current-mode control over voltage-
mode control are twofold. First, there is the feed-forward
characteristic brought on by the controller’s ability to
adjust for variations in the input voltage on a cycle-by-
cycle basis. Secondly, the stability requirements of the
current-mode controller are reduced to that of a single-
pole system unlike the double pole in the voltage-mode
control scheme.
High-Performance, Single-Ended, Current-Mode
PWM Controllers
Figure 2. MAX5095A/B Functional Diagram
12
______________________________________________________________________________________
MAX5095A
MAX5095B
COMP
SYNC
GND
CS
3
5
1
2
BIDIRECTIONAL
Current-Mode Control Loop
SYNC
2R
0.3V
EN-DRV-BAR
ILIM
R
CPWM
DELAY
REFERENCE
2.5V
2.5V
2.5V
REG_OK
The MAX5094/MAX5095 use a current-mode control loop
where the output of the error amplifier is compared to the
current-sense voltage (V
nal is lower than the inverting input of the CPWM com-
parator, the output of the comparator is low and the
switch is turned on at each clock pulse. When the cur-
rent-sense signal is higher than the inverting input of the
CPWM comparator, the output is high and the switch is
turned off.
OSC Q
PREREGULATOR
VP
5V
CLK
100% MAX DUTY CYCLE (MAX5095A)
50% MAX DUTY CYCLE (MAX5095B)
SHUTDOWN
THERMAL
S
R
Q
EN-REF
BG
SNS
VP
UVLO
5V REGULATOR
VOLTAGE-
DIVIDER
CS
8.4V/7.6V
V
DD
). When the current-sense sig-
VOLTAGE-
DIVIDER
26.5V
7
8
6 OUT
4 R
V
REF
CC
T
/C
T