TDA16833 查看數據表（PDF） - Infineon Technologies

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TDA16833

Off-line SMPS Controller with 600 V Sense CoolMOS on Board

Infineon Technologies 

TDA 16831-4

switched off the output capacitor is

discharged via pulse signal pwmpls. The

oscillator signal slogpwm sets the RS-flip-

flop. The gate drive circuit is switched on,

when capacitor voltage exceeds the

internal threshold of 0.4 V. This leads to a

linear ramp, which is created by the output

of the amplifier. Therefore duty cycle of

0 % is possible. The amplifier is

compensated through an internal compen-

sation network.

The transfer function of the amplifier can

be described as

-V---o-

Vi

=

p-----×-----(--1----K-+---i--T----×-----p----); p

=

jω

the step response is described with

Vo

=

Vi

×

Ki

×

æ

ç

è

to

n

–

T

+

T

×

e----t-To----n-÷ö

Ki

=

-4---0-

ton

T = 850 ns

Comparator (pwmcomp)

The comparator pwmcomp compares the

amplified current signal pwmrmp of the

CoolMOS with the reference signal pwmin.

Pwmin is created by an external

optocoupler or external transistor and

gives the information of the feedback

circuitry. When the pwmrmp exceeds the

reference signal pwmin the comparator

switches the CoolMOS off.

Logic (logpwm)

The logic logpwm comprises a RS-flip-flop

and a NAND-gate. The NAND-gate

insures that CoolMOS transistor is only

switched on when sosta is on and pwmin

has exceeded minimum threshold and

pwmin is below pwmrmp and

currentshutdown is off and tempshutdown

is off and tff sets the starting impulse.

CoolMOS transistor is switched off when

pwmrmp exceeds pwmin or duty cycle

exceeds 0.5 or pwmcs exceeds Imax or

silicium temperature exceeds Tmax or uvlo

is going below threshold. The RS flip flop

ensures that with every frequency period

only one switch on can occur (double pulse

suppression).

Gate Drive (gtdrv)

Gtdrv is the driver circuit for the CoolMOS

and is optimized to minimize EMI

influences and to provide high circuit

efficiency. This is done by smoothing the

switch on slope when reaching the

CoolMOS threshold. Leading switch on

spike is minimized then. When CoolMOS

is witched off, the falling slope of the gate

driver is slowed down when reaching 2 V.

So an overshoot below ground can't occur.

Also gate drive circuit is designed to

eliminate cross conduction of the output

stage.

Current Shut Down (cssd)

Current shut down circuit switches the

CoolMOS immediately off when the sense

current is exceeding an internal threshold

of 100 mV at Rsense.

Data Sheet

7

1999-12-10

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