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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You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for current
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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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