L6725A STMicroelectronics, L6725A Datasheet - Page 22

• Manufacturer Part Number: L6725A
• Description: IC PWM CTLR VOLTAGE MODE SO-16N
• Manufacturer: STMicroelectronics

Specifications of L6725A

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 550kHz
• Duty Cycle: 100%
• Voltage - Supply: 4.5 V ~ 18 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-SOIC (3.9mm Width)
• Frequency-max: 550kHz
• Output Voltage: 0.603 V
• Input Voltage: 1.8 V to 18 V
• Switching Frequency: 500 KHz
• Operating Temperature Range: - 40 C to + 125 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 100 %
• Package: SO16N
• For Use With: 497-5867 - EVAL BOARD 20A 250KHZ L6725497-5500 - EVAL BOARD FOR L6725
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Demoboard
7
7.1
Figure 16. Demoboard schematic
22/32
EXT REF
GIN
VCC
VIN
Demoboard
20A board description
L6725 demoboard realizes in a four layer PCB a step-down DC/DC converter and shows the
operation of the device in a general purpose application. The input voltage can range from 4.5V
to 14V and the output voltage is at 3.3V. The module can deliver an output current in excess of
20A. The switching frequency is set at 250kHz (controller free-running FBSWB) but it can be
set to 500kHz acting on the EAREF pin.
J1
C8
R5
R6
R8
J2
C7
EAREF
VCC
GND
C5
C10
12
3
15
11
VCCDR
R7
D1
L6725
4
OCL
8
BOOT
U1
R9
1
5
COMP
OCH
C2
C3
R2
R4
C9
VFB
16
10
2
7
6
9
PGND
SS
HGATE
PHASE
LGATE
C11
R11
R10
Q1-3
Q4-6
C4
R1
D3
R3
C1
R12
C15
C12-C13
L1
C16-C19
L6725 - L6725A
GOUT
VOUT