Datasheet > TOP222YN

TOP222YN

更新时间： 2022-05-14 22:08:35

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		/
页数	文件大小	规格书
20页	1537K
描述
Three-Terminal Off-Line PWM Switch

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数据手册

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TOP222YN 数据手册

TOP221-227

ꢗ1

ꢅ.ꢅ µꢙ

ꢇꢃ

ꢈꢉRꢊꢃ0

ꢌ12 ꢍ

ꢅTꢁ

ꢌꢃ

ꢅꢅ0 µꢍ

ꢅꢎ ꢏ

ꢌꢅ

ꢃꢃ0 µꢍ

ꢅꢎ ꢏ

ꢏR1

ꢀ6ꢓꢔꢃ00

ꢇ1

ꢑꢒꢏꢃ6ꢌ

ꢑR1

ꢊ00 ꢏ

ꢗꢃ

ꢃꢃ ꢘꢙ

ꢇꢅ

1ꢋꢊ1ꢊ8

ꢌ1

100 Ω

ꢊꢆ µꢍ

ꢌꢊ

0.1 µꢍ

ꢊ00 ꢏ

TOPꢃꢆꢇꢈꢉꢊ-ꢋꢋ

ꢌ6

Rꢃ

ꢉ1

ꢂ

ꢃ

0.1 µꢍ

ꢐ1

ꢃꢃ0 Ω

ꢐꢚꢀꢃꢃꢊꢀ

ꢄ

ꢄOꢁTꢅOꢀ

ꢃꢎ0 ꢏꢕꢌ

ꢉꢃ

ꢀꢌ81ꢆꢕ

Rꢅ

6.8 Ω

ꢍ1

ꢅ.1ꢎ ꢕ

ꢏRꢃ

1ꢋꢎꢃꢊ1ꢑ

11 ꢏ

ꢌꢆ

1 ꢛꢍ

ꢃꢎ0 ꢏꢕꢌ

ꢒ1

ꢖ1

ꢌꢎ

ꢊꢆ µꢍ

ꢀ

ꢁ

ꢀꢁꢂꢃ01ꢄꢂ0ꢅꢅ1ꢄꢆ

Figure 8. Schematic Diagram of a 20 W Universal Input TOPSwitch-II Power Supply using an 8 lead PDIP.

20 W Universal Supply using 8 Lead PDIP

VR1 clamp leading-edge voltage spikes caused by trans-

former leakage inductance. The power secondary winding

is rectiﬁed and ﬁltered by D2, C2, L1, and C3 to create the

12 V output voltage. R2 and VR2 provide a slight pre-load

on the 12 V output to improve load regulation at light loads.

The bias winding is rectiﬁed and ﬁltered by D3 and C4 to

create a TOPSwitch bias voltage. L2 and Y1-safety capaci-

tor C7 attenuate common mode emission currents caused

by high-voltage switching waveforms on the DRAIN side of

the primary winding and the primary to secondary capaci-

tance. Leakage inductance of L2 with C1 and C6 attenu-

ates differential-mode emission currents caused by the

fundamental and harmonics of the trapezoidal or triangular

primary current waveform. C5 ﬁlters internal MOSFET gate

drive charge current spikes on the CONTROL pin, deter-

mines the auto-restart frequency, and together with R1 and

R3, compensates the control loop.

Figure 8 shows a 12 V, 20 W secondary regulated ﬂyback

power supply using the TOP224P in an eight lead PDIP

package and operating from universal 85 to 265 VAC input

voltage. This example demonstrates the advantage of the

higher power 8 pin leadframe used with the TOPSwitch-II

family. This low cost package transfers heat directly to the

board through six source pins, eliminating the heatsink and

the associated cost. Efﬁciency is typically 80% at low line

input. Output voltage is directly sensed by optocoupler U2

and Zener diode VR2. The output voltage is determined by

the Zener diode (VR2) voltage and the voltage drops across

the optocoupler (U2) LED and resistor R1. Other output

voltages are possible by adjusting the transformer turns ratio

and value of Zener diode VR2.

AC power is rectiﬁed and ﬁltered by BR1 and C1 to create

the high voltage DC bus applied to the primary winding of

T1. The other side of the transformer primary is driven by

the integrated TOPSwitch-II high-voltage MOSFET. D1 and

Rev. G 08/16

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