Техническая Спецификация для Nxp Semiconductors SSL2101 Evaluation Boards SSL2101T/DB/FBCB230V,598 SSL2101T/DB/FBCB230V,598

SSL2101

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The system operates in discontinuous conduction mode if the AUX pin is connected. As 
long as the secondary stroke has not ended, the oscillator will not start a new primary 
stroke. During the first t

sup(xfmr_ring)

 seconds, demagnetization recognition is suppressed. 

This suppression may be necessary in applications where the transformer has a large 
leakage inductance and at low output voltages.

The cycle-by-cycle peak drain current limit circuit uses the external source resistor R

SENSE

 

to measure the current. The circuit is activated after the leading edge blanking time t

leb

. 

The protection circuit limits the source voltage over the R

SENSE

1

 resistor to V

th(ocp)SOURCE

, 

and thus limits the primary peak current.

The short-winding protection circuit is also activated after the leading edge blanking time. 
If the source voltage exceeds the short-winding protection threshold voltage 
V

th(swp)SOURCE

, the IC stops switching. Only a power-on reset will restart normal operation. 

The short-winding protection also protects in case of a secondary diode short circuit.

Accurate temperature protection is provided in the device. When the junction temperature 
exceeds the thermal shut-down temperature, the IC stops switching. During thermal 
protection, the IC current is lowered to the start-up current. The IC continues normal 
operation as soon as the overtemperature situation has disappeared.

 V

0

200

400

800

f (kHz)

phase

(

°

)

40

20

−

20

−

40

0

600

1.

R

SENSE

 is the resistor between the SOURCE pin and GND