HV9921/HV9922/HV9923
3-Pin Switch-Mode LED Lamp Driver ICs
Features
• Constant output current:
- HV9921 – 20mA
- HV9922 – 50mA
- HV9923 – 30mA
• Universal 85 - 264VAC operation
• Fixed off-time buck converter
• Internal 475V power MOSFET
Description
HV9921/HV9922/HV9923 are pulse-width modulated
(PWM), high-efficiency, LED driver control ICs. They
allow efficient operation of LED strings from voltage
sources ranging up to 400VDC. HV9921/22/23 include
an internal high voltage switching MOSFET controlled
with fixed off-time (T
OFF
) of approximately 10μs. The
LED string is driven at constant current, thus providing
constant light output and enhanced reliability. The out-
put current is internally fixed at 20mA for HV9921,
50mA for HV992, and 30mA for HV9923. The peak cur-
rent control scheme provides good regulation of the
output current throughout the universal AC line voltage
range of 85 to 264VAC or DC input voltage of 20 to
400V.
Applications
• Decorative lighting
• Low power lighting fixtures
2014 Microchip Technology Inc.
DS20005311A-page 1
HV9921/HV9922/HV9923
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The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
Errata
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DS20005311A-page 2
2014 Microchip Technology Inc.
HV9921/HV9922/HV9923
PIN DIAGRAM
1
2
3
123
TO-243AA
(SOT-89)
See
Table 2-1
for Pin information.
TO-92
TYPICAL APPLICATION CIRCUIT
AC
LED
1
-
LED
n
HV9921/22/23
3 VDD
GND
2
DRAIN 1
2014 Microchip Technology Inc.
DS20005311A-page 3
HV9921/HV9922/HV9923
1.0
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
Supply Voltage V
DD
................................ -0.3V to +10V
Supply Current I
DD
..............................................+5mA
Operating Ambient temperature ...........-40°C to +85°C
Operating Junction Temperature ........-40°C to +125°C
Storage temperature ..........................-65°C to +150°C
Power dissipation @+25°C for TO-92 .............740 mW
Power dissipation @+25°C for SOT-89....... 1600 mW*
* Mounted on FR4 board, 24mmx25mmx1.57mm
Note:
Stresses above those listed under “Absolute
Maximum Ratings” may cause permanent damage to
the device. This is a stress rating only and functional
operation of the device at those or any other condi-
tions, above those indicated in the operational listings
of this specification, is not implied. Exposure to maxi-
mum rating conditions for extended periods may affect
device reliability.
1.1
ELECTRICAL SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
1
Parameter
Notes
Min
Typ
Max
Units Conditions
TABLE 1-1:
Symbol
Regulator (V
DD
)
V
DD
V
DRAIN
V
UVLO
ΔV
UVLO
I
DD
V
DD
Regulator Output
V
DRAIN
Supply Voltage
V
DD
Under-voltage Threshold
V
DD
Under-voltage Lockout Hysteresis
Operating Supply Current
-
-
-
-
-
-
20
5.0
-
-
7.5
-
-
200
200
-
-
-
-
350
V
V
V
mV
μA
V
DD(EXT)
= 8.5V, V
DRAIN
= 40V
Output (DRAIN)
V
BR
R
ON
C
DRAIN
I
SAT
Breakdown Voltage
ON Resistance
Output Capacitance
MOSFET Saturation Current
Threshold Current - HV9921
Threshold Current - HV9922
Threshold Current - HV9923
Leading Edge Blanking Delay
Minimum ON Time
OFF Time
2
475
-
-
100
18.5
49
28.2
200
-
8
-
-
1
150
-
-
-
300
-
10.5
-
210
5
-
25.5
63
38.2
400
650
13
V
Ω
pF
mA
mA
mA
mA
ns
ns
μS
I
DRAIN
= 20mA (HV9921)
I
DRAIN
= 50mA (HV9922)
I
DRAIN
= 30mA (HV9923)
V
DRAIN
= 400V
-
3
3
Current Sense Comparator
2
2
2
2
,
3
I
THL
T
BLANK
T
ON(MIN)
T
OFF
1
2
3
-
-
OFF-Time Generator
Specifications are T
A
= 25°C, V
DRAIN
= 50V unless otherwise noted.
Applies over the full operating ambient temperature range of -40°C < T
A
< +125°C.
For design guidance only
DS20005311A-page 4
2014 Microchip Technology Inc.
HV9921/HV9922/HV9923
THERMAL RESISTANCE
Package
TO-92
TO-243AA(SOT-89)
θja
132°C/W
133°C/W
FIGURE 1-1:
1.10
TYPICAL PERFORMANCE CHARACTERISTICS (T
J
= 25°C UNLESS OTHERWISE NOTED)
200
180
Normalized Threshold Current
1.05
160
ON Resistance (μΩ)
-15
10
35
60
85
110
1.00
140
120
100
80
60
40
20
0.95
0.90
0.85
0.80
-40
Junction Temperature, °C
12
0
-40
-15
10
35
60
85
110
Junction Temperature (°C)
1000
8
DRAIN Capacitance (pF)
-15
10
35
60
85
110
10
OFF Time (μS)
100
6
4
10
2
0
-40
1
Junction Temperature (°C)
180
580
160
0
10
20
30
40
DRAIN Voltage (V)
T
J
= 25°C
T
J
= 125°C
DRAIN Breakdown Voltage (V)
570
DRAIN Current (mA)
-15
10
35
60
85
110
560
550
540
530
520
510
500
490
-40
140
120
100
80
60
40
20
0
0
10
20
30
40
Junction Temperature (°C)
DRAIN Voltage (V)
2014 Microchip Technology Inc.
DS20005311A-page 5
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