HV9922 Supertex, Inc., HV9922 Datasheet - Page 7

• Manufacturer Part Number: HV9922
• Description: 3-pin Switch-mode Led Lamp Driver Ic
• Manufacturer: Supertex, Inc.

Functional Block Diagram
Figure 3. Typical Efficiency
Figure 3. Typical Efficiency
Figure 5. Typical Efficiency
Figure 5. Typical Efficiency
82.00
82.00
80.00
80.00
78.00
78.00
76.00
76.00
74.00
74.00
72.00
72.00
70.00
70.00
68.00
68.00
66.00
66.00
64.00
64.00
62.00
62.00
75
75
25mA
25mA
100 125 150 175 200 225 250 275
100 125 150 175 200 225 250 275
Input AC Line Voltage (VAC)
Input AC Line Voltage (VAC)
LEADING EDGE SPIKE
LEADING EDGE SPIKE
SWITCH OFF
SWITCH OFF
REF
HV9922
GND
+
-
10.5µs
T
T
OFF
BLANK
=
= 300ns
S
R
Q
Q
7
Figure 4. Switch-Off Transition. Ch1: V
Figure 4. Switch-Off Transition. Ch1: V
Figure 6. Switch-Off Transition. Ch1: V
Figure 6. Switch-Off Transition. Ch1: V
VDD
Regulator
7.5V
DRAIN
R
ZERO VOLTAGE
ZERO VOLTAGE
TRANSITION
TRANSITION
DRAIN
DRAIN
DRAIN
DRAIN
, Ch3: I
, Ch3: I
, Ch3: I
, Ch3: I
HV9922
DRAIN
DRAIN
DRAIN
DRAIN