1/4
STRUCTURE
Silicon Monolithic Integrated Circuit
NAME OF PRODUCT
DC-AC Inverter Control IC
TYPE
FUNCTION
ＢＤ９２２１Ｆ
・Using 20V process / 1ch control with Push-Pull
・BD9221F can synchronous operating with external sync-signal
・Accuracy of drive output frequency：3.5%（IC Only/Built-in CT Capacitor）
・High accuracy timer latch current(±15%)
・Built-in FAIL function
・Adjustable latch timing
・Adjustable slow start time
・Lamp current and voltage sense feedback control
・Mode-selectable the operating or stand-by mode by STB pin (Typ.=0uA )
○Absolute Maximum Ratings（Ta = 25℃）
Parameter
Supply Voltage
OUTPUT PIN Voltage
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature
Power Dissipation
*1
Symbol
V
CC
N1, N2
Topr
Tstg
Tjmax
Pd
Limits
20
20
-40½+85
-55½+150
+150
SOP18:687*
Unit
V
V
℃
℃
℃
mW
Pd derate at -5.5mW/℃ for temperature above Ta = 25℃ (When mounted on a PCB 70.0mm×70.0mm×1.6mm)
〇動½範囲
項目
Supply voltage
Input Frequency Ratio CLK_IN PIN
Input Frequency Ratio PWM_IN PIN
DRIVER frequency
記号
範囲
単½
VCC
F_CLK_IN
8.0 ½ 18.0
40½180
0.060½0.5
20 ½ 90
V
kHz
kHz
kHz
F_PWM_IN
F_OUT
REV. A
2/4
○Electric Characteristics（Ta=25℃、VCC=12V、STB=3.0V）
LIMIT
Item
(（WHOLE DEVICE）)
Operating current
Stand-by current
Icc1
Icc2
－
－
2.0
0
4.0
20
mA
μA
RT=100kΩ, FB=GND, IS=1.5V
VSTB=0V
SYMBOL
MIN.
TYP.
MAX.
UNIT
CONDITION
((STAND BY CONTROL）
）
Stand-by voltage H
Stand-by voltage L
STB PIN pull down resistor
VSTBH
VSTBL
RSTB
2
-0.3
180
-
-
375
VCC
0.8
750
V
V
kΩ
System ＯＮ
System ＯＦＦ
VSTB=2V
（
（VCC UVLO BLOCK））
）
Operating voltage
Hesteresis width
VCC_UVLO
⊿UVLO_HYS
7.2
0.3
7.5
0.5
7.8
0.7
V
V
VCC=6V→8V sweep
VCC=8V→6V sweep
（
（OSC BLOCK）
）
RT pin Voltage
SRT ON resistance
VRT
RSRT
1.300
－
1.500
75
1.700
150
V
Ω
RT=100kΩ
VSRT=0.1V
((Synchronous Block))
CLK_IN PIN voltage H
CLK_IN PIN voltage L
CLK_IN PIN pull down resistor
VCTSIN_H
VCTSIN_L
R_CTSIN
2.4
-0.3
1000
-
-
2000
5
0.8
4000
V
V
kΩ
V_CT_SYNC_IN=0V⇒3.0V
V_CT_SYNC_IN=3.0V⇒0V
VCT_SYNC_IN=5V
((PWM Dimming Block))
PWM_IN PIN voltage H
PWM_IN PIN voltage L
PWM_IN PIN pull down resistor
VPWMIN_H
VPWMIN_L
R_PWMIN
2.4
-0.3
1000
-
-
2000
5
0.8
4000
V
V
kΩ
VPWM_IN=0V⇒3.0V
VPWM_IN=3.0V⇒0V
VPWM_I=5V
（
（FEED BACK BLOCK）
）
IS threshold voltage
VS threshold voltage
IS source current
IS COMP detect voltage
VIS
VVS
IIS
VISCOMP
1.225
1.200
16
0.565
1.250
1.250
20
0.625
1.275
1.300
24
0.685
V
V
μA
V
IS=1.0V
IS=1.3V→0.5V
（
（SLOW START BLOCK）
）
SS term END Voltage
Soft start current
VSS
ISS
2.400
1.7
2.500
2.0
2.600
2.3
V
μA
VSS=0V⇒3V
VSS=1.0V IS=1.5V
（
（COMP BLOCK）
）
COMP over voltage
detect voltage
Hysterisis width (COMP)
COMP PIN pull down resistor
FAIL ON resistance
VCOMPH
⊿VCOMPH
RCOMP
RFAIL
1.900
0.100
1000
－
2.000
0.200
2000
75
2.100
0.300
4000
150
V
V
kΩ
Ω
VSS＞2.5V VCOMP=1.5V→2.5V
VSS＜2.0V VCOMP=2.5V→1.5V
COMP=5V
VFAIL=0.1V
（
（OUTPUT BLOCK）
）
N1,N2 PIN output
sink resistance
N1,N2 PIN output
source resistance
MAX DUTY
Drive output frequency
RsinkN
RsourceN
MAX DUTY
FOUT
1.5
4.5
45
48.25
3.0
9
47.0
50
6.0
18
49.5
51.75
Ω
Ω
%
kHz
IIN=100mA
IIN=-100mA
FOUT=50kHz
RT=100kΩ Without Synchronous signal
（
（TIMER BLOCK）
）
Timer Latch setting voltage
Timer Latch setting current
VCP
ICP
2.900
1.7
3.000
2.0
3.100
2.3
V
μA
VCP=0V⇒3.2V
CP=1.0V IS=1.5V COMP=3.0V
（This product is not designed to be radiation-resistant.）
REV. A
3/4
〇Package Dimensions
MAX11.55 (include. BURR)
Device name
BD9221F
Lot No.
SOP-18 (Unit:mm)
〇PIN No.・PIN NAME・FUNCTION
BD9221F
No.
1
2
PIN
STB Stand-by switch
Function
No.
18
17
PIN
N1
N2
NMOS FET driver
NMOS FET driver
Function
VCC Supply voltage input
External resistor from SRT to RT for adjusting
3
SRT
the triangle oscillator
External resistor from SRT to RT for adjusting
16
PGND Ground for FET drivers
4
5
6
7
8
9
RT
the triangle oscillator
15
14
13
12
11
10
CLK_IN OUTPUT synchronous signal input pin
PWM_IN Dimming pulse signal input pin
SS
CP
External capacitor from SS to GND for Soft Start Control
External capacitor from CP to GND for Timer Latch
GND GROUND
-
FB
IS
VS
Non Conection
Error amplifier output
Error amplifier input
Error amplifier input
FAIL Error signal output pin
COMP Over voltage detect pin
○Setting of synchronous function
BD9221F output frequency with ＜CLK_IN Freq.＊1/2＞to N1 and N2 pin.
（signal amplitude level : H=over 2.4V ,L=under0.8V）
Set the IC frequency by adjusting RT resistor value, in order to satisfy under synchronous
condition.
F(IC)=F(CLK_IN)*1/2*A
F(IC)½½½IC Freq. F(CLK_IN)½½½Synchronous Freq. A½½½under 90%／over 75%
However this synchronous function is connected with SRT movement.
SRT=OFF(OPEN) : synchronous mode.
SRT=ON(LOW):IC Frequency mode.
REV. A
4/4
〇NOTE
FOR USE
1. This product is produced with strict quality control, but might be destroyed if used beyond its absolute maximum ratings.
Once IC is destroyed, failure mode will be difficult to determine, like short mode or open mode. Therefore, physical
protection countermeasure, like fuse is recommended in case operating conditions go beyond the expected absolute maximum
ratings.
2.
The circuit functionality is guaranteed within of ambient temperature operation range as long as it is within recommended
operating range. The standard electrical characteristic values cannot be guaranteed at other voltages in the operating
ranges, however the variation will be small.
3.
Mounting failures, such as misdirection or miscounts, may harm the device.
4.
A strong electromagnetic field may cause the IC to malfunction.
5.
The GND pin should be the location within ±0.3V compared with the PGND pin. ALL voltage should be under VCC voltage
+0.3V
6. BD9221F incorporate a built-in thermal shutdown circuit (TSD circuit). The thermal shutdown circuit (TSD circuit) is
designed only to shut the IC off to prevent runaway thermal operation. It is not designed to protect the IC or guarantee
its operation of the thermal shutdown circuit is assumed.
7. When modifying the external circuit components, make sure to leave an adequate margin for external components actual
value and tolerance as well as dispersion of the IC.
8. About the external FET, the parasitic Capacitor may cause the gate voltage to change, when the drain voltage is switching.
Make sure to leave adequate margin for this IC variation.
9. Under operating CP charge (under error mode) analog dimming and burst dimming are not operate.
10. Under operating Slow Start Control (SS is less than 2.5V), It does not operate Timer Latch.
11. By STB voltage is changed to 2 states. Therefore, do not input STB pin voltage between one state and the other state
(0.8½2.0V).
12. The pin connected a connector need to connect to the resistor for electrical surge destruction.
13. This IC is a monolithic IC which (as shown is Fig-1) has P
+
substrate and between the various pins. A P-N junction is
formed from this P layer of each pin. For example, the relation between each potential is as follows,
○(When GND > PinB and GND > PinA, the P-N junction operates as a parasitic diode.)
○(When PinB > GND > PinA, the P-N junction operates as a parasitic transistor.)
Parasitic diodes can occur inevitably in the structure of the IC. The operation of parasitic diodes can result in mutual
interference among circuits as well as operation faults and physical damage. Accordingly you must not use methods by
which parasitic diodes operate, such as applying a voltage that is lower than the GND (P substrate) voltage to an input
pin.
Transistor (NPN)
Resistance
(PinA)
(PinB)
B
C
Ｃ
N
E
GND
P
＋
P
N
P
＋
P substrate
GND
Parasitic diode
(PinB)
Ｎ
P substrate
GND
Parasitic diode
Ｎ
N
N
(PinA)
B
Parasitic diode
GND
Ｂ
C
Ｃ
E
Ｅ
GND
Parasitic diode
Other adjacent components
Fig-1 Simplified structure of a Bipolar IC
REV. A
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, commu-
nication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.
The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-
controller or other safety device). ROHM shall bear no responsibility in any way for use of any
of the Products for the above special purposes. If a Product is intended to be used for any
such special purpose, please contact a ROHM sales representative before purchasing.
If you intend to export or ship overseas any Product or technology specified herein that may
be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to
obtain a license or permit under the Law.
Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact us.
ROHM Customer Support System
http://www.rohm.com/contact/
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
R1010A
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
