ICE2A165 Datasheet, PDF(7/23 Page) Infineon Technologies AG – Off-Line SMPS Current Mode Controller with integrated 650V/800V CoolMOS™

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ICE2A165 Datasheet, PDF (7/23 Pages) Infineon Technologies AG – Off-Line SMPS Current Mode Controller with integrated 650V/800V CoolMOS™

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CoolSETâ¢-F2

ICE2A165/265/365

ICE2A180/280

Functional Description

3 Functional Description

3.1

Power Management

3.2

Improved Current Mode

VCC

M ain Line (100V-380V)

R Start-Up

C VCC

Prim ary W inding

Power Management

U n d e rv o lta g e

Lockout

13.5V

In te rn a l

Bias

8 .5 V

Power-Down

Reset

Power-Up

Reset

V o lta g e

R efe ren c e

6.5V

5.3V

4.8V

4.0V

SoftS

6.5V

R Soft-Start

PW M-Latch

Error-Latch

Soft-S tart C om parator

C Soft-Start

E rro r-D e te c tio n

Soft-Start Com parator

PW M -Latch

D rive r

PW M Comparator

0.8V

PWM OP

x3.65

Im proved

Current Mode

Isense

Figure 4 Current Mode

Current Mode means that the duty cycle is controlled

by the slope of the primary current. This is done by

comparison the FB signal with the amplified current

sense signal.

Am plified Current Signal

Figure 3 Power Management

The Undervoltage Lockout monitors the external

supply voltage VVCC. In case the IC is inactive the

current consumption is max. 55ÂµA. When the SMPS is

plugged to the main line the current through RStart-up

charges the external Capacitor CVCC. When VVCC

exceeds the on-threshold VCCon=13.5V the internal bias

circuit and the voltage reference are switched on. After

it the internal bandgap generates a reference voltage

VREF=6.5V to supply the internal circuits. To avoid

uncontrolled ringing at switch-on a hysteresis is

implemented which means that switch-off is only after

active mode when Vcc falls below 8.5V.

In case of switch-on a Power Up Reset is done by

reseting the internal error-latch in the protection unit.

When VVCC falls below the off-threshold VCCoff=8.5V the

internal reference is switched off and the Power Down

reset let T1 discharging the soft-start capacitor CSoft-Start

at pin SoftS. Thus it is ensured that at every switch-on

the voltage ramp at pin SoftS starts at zero.

0.8V

D rive r

Ton

Figure 5 Pulse Width Modulation

In case the amplified current sense signal exceeds the

FB signal the on-time Ton of the driver is finished by

reseting the PWM-Latch (see Figure 5).

Datasheet

September 2001

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