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Sanken STR-W6756 Manual

Quasi-resonant topology primary switching regulators
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Features and Benefits

▪ Quasi-resonant topology IC  Low EMI noise and soft
switching
▪ Bottom-skip mode  Improved system efficiency over
the entire output load by avoiding increase of switching
frequency
▪ Auto-Standby mode  Lowers input power at very light
output load condition
▪ Avalanche-guaranteed MOSFET  Improves system-level
reliability and does not require V
▪ 650 V / 0.73 Ω
▪ Various protections  Improved system-level reliability
Continued on the next page...
Package: 6-pin TO-220
Not to scale
S/GND
ROCP
28103.33
derating
DSS
Typical Application Diagram
D
V
CC
1 1
4 4
STR-W6756
Controller
(MIC)
6 6
FB
3 3
7 7
5 5
RX
OCP/BD
SS /OLP
CX
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp/en/
Quasi-Resonant Topology
Primary Switching Regulators
Description
The STR-W6756 is a quasi-resonant topology IC designed for
SMPS applications. It shows lower EMI noise characteristics
than conventional PWM solutions, especially at greater than
2 MHz. It also provides a soft-switching mode to turn on the
internal MOSFET at close to zero voltage (V
by use of the resonant characteristic of primary inductance
and a resonant capacitor.
The package is a fully molded TO-220, which contains the
controller chip (MIC) and MOSFET, enabling output power up
to 140 W with universal input or 240 W with a 230 VAC input.
The bottom-skip mode skips the first bottom of V
on the MOSFET at the second bottom point, to minimize an
increase of operating frequency at light output load, improving
system-level efficiency over the entire load range.
There are two standby modes available to reduce the input power
under very light load conditions. The first is Auto-Standby
mode, which is internally triggered by periodic sensing, and
the other is a manual standby mode, which is executed by
clamping the secondary output. In general applications, the
manual standby mode reduces the input power further compared
to Auto-Standby mode.
The soft-start mode minimizes surge voltage and reduces
power stress to the MOSFET and to the secondary rectifying
Continued on the next page...
P
S1
D
S2
A
For ErrAmp, Sanken SE series device recommended
B
For SI, Sanken linear regulator IC recommended
STR-W6756
bottom point)
DS
and turns
DS
+B
A
ErrAmp
GND
Standby
ON/OFF
LowB
Standby
B
SI
Out
GND

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Summary of Contents for Sanken STR-W6756

  • Page 1: Features And Benefits

    Features and Benefits Description ▪ Quasi-resonant topology IC  Low EMI noise and soft The STR-W6756 is a quasi-resonant topology IC designed for switching SMPS applications. It shows lower EMI noise characteristics ▪ Bottom-skip mode  Improved system efficiency over...

  • Page 2: Absolute Maximum Ratings

    Refer to figure 5 All performance characteristics given are typical values for circuit or system baseline design only and are at the nominal operating voltage and an ambient temperature, T , of 25°C, unless oth er wise stated. 28103.33 SANKEN ELECTRIC CO., LTD.
  • Page 3 Figure 2 – MOSFET Safe Operating Area Drain Current versus Voltage Derating Curve at T = 25°C, Single Pulse 100.00 10.00 1.00 Refer to figure 1 for MOSFET SOA temperature derating coefficient 0.10 1000 Temperature, T (°C) Drain-to-Source Voltage, V 28103.33 SANKEN ELECTRIC CO., LTD.
  • Page 4 Channel Junction Temperature, T (°C) Figure 5 – MOSFET Power Dissipation versus Temperature With infinite heatsink = 29 W at T ≤ 25°C Without heatsink = 1.3 W at T ≤ 25°C Ambient Temperature, T (°C) 28103.33 SANKEN ELECTRIC CO., LTD.

  • Page 5: Electrical Characteristics

    θch-F Current polarity with respect to the IC: positive current indicates current sink at the terminal named, negative current indicates source at the terminal named. The latch circuit means a circuit operated OVP and OLP. 28103.33 SANKEN ELECTRIC CO., LTD.
  • Page 6 Dimensions in millimeters M is the month (1 to 9, O, N, D) DD is the 2-digit date Leadframe plating Pb-free. Device composition includes high-temperature solder (Pb >85%), which is exempted from the RoHS directive. 28103.33 SANKEN ELECTRIC CO., LTD.
  • Page 7 Ensure all test When the package is tightened at two or more places, first parameters are within the ratings specified by Sanken for pre-tighten with a lower torque at all places, then tighten the products.
  • Page 8 (aerospace equipment, nuclear power control systems, life support systems, etc.) is strictly prohibited. • In the case that you use Sanken products or design your products by using Sanken products, the reliability largely depends on the degree of derating to be made to the rated values. Derating may be interpreted as a case that an operation range is set by derating the load from each rated value or surge voltage or noise is considered for derating in order to assure or improve the reliability.