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IX9907 Schematic ( PDF Datasheet ) - IXYS

Teilenummer IX9907
Beschreibung LED Driver
Hersteller IXYS
Logo IXYS Logo 




Gesamt 10 Seiten
IX9907 Datasheet, Funktion
INTEGRATED CIRCUITS DIVISION
Features
Internal 650V, 2power MOSFET
Single stage, primary control with PFC and dimming
features
>90% efficiency
Power factor >98%
Wide operating voltage range
Digital soft-start
Foldback correction and cycle-by-cycle peak current
control
Output over-current and over-voltage protection
Over-temperature protection
Under-voltage lockout
Applications
Incandescent Bulb Replacement
Solid State Lighting
Industrial and Commercial Lighting
IX9907 Functional Block Diagram
ZCV
Ringing
Suppress
Blanking
VCC
IX9907
High Voltage, Dimmable
LED Driver with PFC Control
Description
The IX9907 is a quasi-resonant controller optimized
for phase-cut dimmable, off-line LED applications.
Precise PWM generation supports phase-cut dimming
and power factor correction.
The IX9907 incorporates an internal 650V power
MOSFET. It has a wide voltage operating range and
low power consumption. Multiple safety features
ensure full system protection under fault conditions.
With its strong feature set and low cost, the IX9907 is
an excellent choice for quasi-resonant, off-line flyback
LED bulb designs.
The IX9907 is available in a standard 8-pin SOIC
package.
Ordering Information
Part
IX9907N
IX9907NTR
Description
8-Pin SOIC (100/Tube)
8-Pin SOIC (2000/Reel)
VR
CS
DS-IX9907-R02
Reference Voltage
Generator
Over-Voltage Protection
Leading
Edge
Blanking
Foldback
Sense Amp
Over-Temp
Sensor
Foldback
Correction
VCC Monitor
Over - Under
Voltage Lockout
Control
Logic
Soft-Start
Control
Gate
Control
Shorted Winding Detection
Leading
Edge
Blanking
Leading
Edge
Blanking
PFC
LPF
GND
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Analog
Mux
DRAIN
SOURCE
1






IX9907 Datasheet, Funktion
INTEGRATED CIRCUITS DIVISION
IX9907
2. Functional Description
Figure 1 IX9907 Typical Application
AC
-
+
CIN
R1 Q1
DVCC
RZCV1
Z1
CVCC
CZCV
RZCV2
T1
SNUBBER
DOUT
COUT
Aux
VCC ZCV DRAIN
IX9907
SOURCE
RIN1 VR GND CS
DVR
CC
LEDs
RIN2 CVR
RCS
2.1 Soft Start
Once the main input voltage is applied, a rectified
voltage will appear across CIN. VCC capacitor (CVCC)
will be charged during the power-up phase of
operation through an external transistor. Once VCC
reaches VVCC_on (typically 18V), the device will
Figure 2 Start-Up
initiate a soft-start sequence. This is intended to
minimize the electrical stresses on the device’s
MOSFET power switch, DOUT, DVCC, and the
transformer. The soft-start operates as shown in
Figure 2. The duration of this soft-start is 12mS
nominal and steps VCS, the current sense voltage, to
four values, as shown.
Maximum Current (Sense Voltage)
During Soft-Start
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Time (ms)
6
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R02

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