General Description

The MAX17606 is a secondary-side synchronous driver

and controller specifically designed for the isolated flyback

topology operating in Discontinuous Conduction Mode

(DCM) or Border Conduction Mode (BCM). By replacing

the secondary diode with a MOSFET, the device improves

the efficiency and simplifies thermal management. The

both logic-level and standard MOSFETs used for flyback

synchronous rectification. The 36V input voltage allows

it to drive from either the output voltage or rectified drain

voltage of the secondary MOSFET. Programmable minimum

on and off-times provide flexibility needed to handle

transformer parasitic element-related ringing in a robust

manner. With 2A/4A source/sink currents, the MAX17606

gate transition times.

Benefits and Features

● Wide 4.5V to 36V Input

● 2A/4A Peak Source/Sink Gate Drive Currents

● Suitable for Discontinuous Conduction Mode (DCM),

Border Conduction Mode (BCM)

● 320µA (typ) Low Quiescent Current

● Programmable Turn-Off Trip Point

● Programmable Minimum Off-Time to Handle DCM

Ringing

● Thermal-Shutdown Protection

● 6-Lead SOT-23 Package

Applications

● High-Efficiency Isolated Flyback Converters

Ordering Information appears at end of data sheet.

19-7758; Rev 0; 10/15

MAX17606

Secondary-Side Synchronous MOSFET Driver

for Flyback Converters

Typical Application Circuit for 24V to 5V, 3A Isolated Flyback Converter

C1

4.7µF

x4

C2

0.1µF

EN/UVLO

IN

SGND

OVI

EP

SS

DITHER

RT

R5

47Ω

C4

1nF

R1

49.9kΩ

T1

U1

MAX17597

R8

470kΩ

R11

470Ω

R12

1.5kΩ

R13

487Ω

C8

0.22µF

U4

U2

MAX17606

5V,3A

C3

22nF

PGND

R9

4.7Ω

D1

C10

2.2µF

R14

100kΩ

T1-WE750342955

Q1-FDMS86102LZ

Q2-BSZ040N04LSG

C5

1nF

R7

0.02Ω

Q1

R6

220Ω

CS

0

R10

2.74kΩ

Q2

C7

2.2µF

0

DRN

GATE

C9

100µF

6x

GND

0

0

C6

2.2µF

4

3

1

2

U3

R2

49.9kΩ

COMP

FB

R3

10.5kΩ

0

R4

22kΩ