AMG-LL9910B Datasheet, PDF (4/15 Pages) alpha microelectronics gmbh – Universal High Voltage Single Channel LED Driver

AMG-LL9910B
Universal High Voltage Single Channel LED Driver
4. Block Diagram
Vin
LD
CS
250mV
GND
Regulator
POR +
UVLO
1
&
Blanking
RQ
S
Oscillator
Vdd
Gate
PWMD
Figure 2: Block Diagram
Rosc
5. Block Descriptions
Linear Regulator
Generates a stable supply for the logic. May also supply external circuitry.
POR + UVLO
Power on Reset and Under Voltage lockout. The IC is released from reset, after the Vdd rises
above the UVLO voltage.
Linear Dimming Comparator
Manual setting of the VCS threshold.
Current Sense Comparator
Current limiting comparator.
Blanking Timer
Inserts a time delay from CS trip to Gate low, in order to enable100% duty cycle.
AMG-LL9910B Revision: B
09/13/12
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