TECHNICAL NOTE
Regulator IC Series for Digital Still Cameras / Digital Video Cameras
Strobe Charge Control ICs
BD4211FV / BD4210EKN
Description
The strobe charge control IC is a self-oscillating switching regulator that uses a transformer. Its provides highly efficient
charge capacitors in strobe applications.
Features
1. Adjustable transformer primary-side peak current (BD4210EKN)
2. The third stages switching transformer primary-side peak current (BD4211FV)
3. Built-in power transistor
4. The power transistor off time can be controlled with the RT pin, allowing the charge time to be set externally.
5. Standby mode switching with the START pin
6. Includes charge complete signal output (FULL) pin.
7. Includes charge voltage detection (VC) pin (can be set externally).
8. Built-in thermal shutdown circuit (TSD)
9. Built-in IGBT driver (BD4210EKN)
Applications
Digital still cameras, single-lens reflex cameras, digital video cameras
Product Line
Parameter
Supply voltage
Primary-side peak current
Standby function
IGBT driver
Package
BD4211FV
2.5 V to 6 V
0.65A,0.93A,1.21A
Yes
-
SSOP-B8
BD4210EKN
2.5 V to 9 V
0.5 A to 2.0 A
Yes
Yes
HQFN28V
Absolute maximum ratings
Parameter
Supply voltage
PVC pin (DC characteristics)
PVC pin (PULSE )
Power dissipation
Operating temperature
Storage temperature range
Junction temperature
Symbol
VMAX
VPVC
VPVC
Pd
Topr
Tstg
Tjmax
BD4211FV
7
36
50
*1
4.37*
2
−35
to +85
−55
to +150
150
BD4210EKN
10
36
50*
1
2.25*
3
−35
to +85
−55
to +125
125
Unit
V
V
V
W
°C
°C
°C
*1: Pulse width of 100
µs
or less.
*2: Reduced by 43.7 mW/°C over Ta = 25°C. (When mounted on 70 mm
×
70 mm
×
1.6 mm, glass epoxy)
*3: Reduced by 22.5 mW/°C over Ta = 25°C. (When mounted on 70 mm
×
70 mm
×
1.6 mm, glass epoxy)
Ver.B July 2006
Recommended operating ranges
Parameter
Supply voltage
PVC pin voltage range
Electrical characteristics
BD4211FV (Ta=25°C，Vcc=5.0 V, RT=100k
Ω
,ISEL=GND)
Symbol
Vcc
VPVC
BD4211FV
2.5 to 6
Up to 35
BD4210EKN
2.5 to 9
Up to 35
Unit
V
V
Parameter
[Overall device]
Average operating current
consumption 1
Average operating current
consumption 2
Symbol
Min.
Limit
Typ.
Max.
Unit
Conditions
Vbat=5V
RT=56kΩ
VC=0.5V ISEL=”L”
Vbat=5V
RT=56kΩ
VC=0.5V ISEL=”H”
START=0V
ICCA1
ICCA2
−
−
−
2.0
−
90
−
−
0.55
0.81
1.09
−
0
2.4
4.6
−
0.97
0.2
3.6
1.386
300
−
17
30
−
−
−
130
−
−
0.65
0.93
1.21
0.23
−
2.5
−
50
1.0
0.3
4.5
1.400
800
−
30
60
1
−
0.4
170
2.25
1
0.75
1.05
1.33
0.35
0.4
2.6
5
100
1.03
0.4
5.4
1.414
−
1
mA
mA
µA
V
V
µA
V
µA
A
A
A
V
V
V
V
µA
V
V
µS
V
µA
µA
Circuit current during standby operation
ISTB
[Standby control pin]
START pin high voltage
VSTH
START pin low voltage
VSTL
Input bias current
ISTART
[Protection circuit block]
UVLO detection voltage
VUVLOTH
[Transformer primary-side driver block]
Ileak
Leak current when driver o½½
Peak current when driver on 1
lpeak1
Peak current when driver on 2
lpeak2
Peak current when driver on 3
lpeak3
PVC saturation voltage*
VPVCE
[Charging control block]
ISEL pin low-level input voltage
VISELL
ISEL pin middle-level input voltage
VISELM
ISEL pin high-level input voltage
VISELH
ISEL pin input current
IISEL
RT pin open voltage 1
VRT1
RT pin open voltage 2
VRT2
Off time
TOFF
[Transformer secondary-side detection block]
Full charge detection voltage
VCTH
FULL pin sink current
IFULLL
FULL pin leak current
IFULLH
*
Design guarantee: Not all units are inspected.
START=5V
Vcc detection
VPVC=30V
ISEL=”L”
ISEL=”M”
ISEL=”H”
IPVC=0.5A
ISEL=5V
VC=1.0V,RT=100kΩ
VC =0V,RT=100kΩ
RT=100kΩ,VC=0.5V
FULL=0.5V
FULL=5V
2/16
BD4210EKN (Ta=25°C，Vcc=3.0 V, VDD2=2.5 V)
Parameter
Symbol
Min.
−
−
1.480
1
3.5
2.0
−
50
−
1.490
−
−
−
−
−
-10
0.20
1.470
7.65
3.8
2.8
1.35
1.505
−
−
−
−
VDD2
×0.8
−
−
−
−
−
−
−
−
−
Limit
Typ.
25
0
1.520
−
5.5
−
−
70
2.1
1.520
0.1
200
−
0.25
0.1
−
0.3
1.5
9.0
4.5
3.3
1.6
1.520
0.3
−
0.6
−
−
−
10
−
300
300
170
100
10
4.5
Max.
30
1
1.560
−
−
−
0.3
100
2.25
1.550
1
500
1.0
0.3
1
10
0.4
1.530
10.35
5.2
3.8
1.85
1.535
1
1
1
1
VDD2
1.0
20
1
500
500
500
500
30
30
Unit
Conditions
START=3V, Ipeak=1A
RT=24kΩ
START=0V
IREF=-1mA
[Overall device]
Average operating current
ICCA
consumption
Circuit current during standby operation
ICCS
[Reference voltage]
Output voltage
VREF
Output current
IVREF
Current capacity when shorted
ISHORT
[Standby control START pin]
START pin high voltage
VSTH
START pin low voltage
VSTL
Input bias current
IST
[Protection circuit block]
VUVLOTH
UVLO detection voltage
OVP comparator detection voltage
VOVPTH
OVP pin sink current
IOVPl
OVP_SW pin on resistance
ROVP_SW
[Transformer primary-side driver block]
Leak current when driver off
Ileak
PVC saturation voltage*
VPVCE
I_ADJ source current
I_ADJl
Primary-side peak current detection
∆
Vcomp1
comparator offset voltage
[Off time determination block]
RT pin open voltage 1
VRTO1
RT pin open voltage 2
VRTO2
Off time 1
TOFF1
Off time 1’
TOFF1’
Off time 2
TOFF2
Off time 2’
TOFF2’
[Transformer secondary-side detection block]
Full charge detection voltage
VCTH
FULL pin low voltage when charging
VFULLL
FULL pin leak current
IFULLH
[IGBT driver block]
High-level current consumption
Low-level current consumption
High-level input voltage
Low-level input voltage
High-level input sink current
Low-level input sink current
Turn-on rise time
Turn-off fall time
Turn-on delay time
Turn-off delay time
On resistance at high output
On resistance at low output
IDD2H
IDD2L
VINH
VINL
IINH
IINL
Tr
Tf
Tdon
Fdoff
RONH
RONL
mA
µA
V
mA
mA
V
V
µA
V
V
µA
Ω
µA
V
µA
mV
V
V
µs
µs
µs
µs
V
V
µA
mA
µA
V
V
µA
µA
ns
ns
ns
ns
Ω
Ω
START=3V
VOVP=3V
VPVC=36V
IPVC=1A
VI_ADJ=0V
VVC=0V,RT=200kΩ
VVC =1.5V,RT=200kΩ
VVC =0.5V,RT=200kΩ
VVC =0.5V,RT=100kΩ
VVC =1.4V,RT=200kΩ
VVC =1.4V,RT=100kΩ
VDD2=3.0V,RFULL=10kΩ
VDD2=3.0V
When IGBT_OUTP and
IGBT_OUTN are shorted
VIGBT_IN=2.5V
C=4700pF
C=4700pF
C=4700pF
C=4700pF
*
Design guarantee: Not all units are inspected.
3/16
Reference data (BD4211FV)
10
8
6
ICC (uA)
ICC (mA)
4
2
0
-2
0
2
4
Vcc
(V)
VCC
(V)
6
8
100
12
10
8
Ta = -35
℃
Ta = 25
℃
6
4
80
Ta = -35
℃
Ta = 25
℃
Ta = 85
℃
Ta = -35℃
40
20
ICC (mA)
Ta = 25
℃
60
2
0
8
0
2
Ta = 85
℃
4
Vcc (V)
VCC (V)
6
8
Ta = 85℃
0
0
2
4
Vcc (V)
VCC (V)
6
Fig.1
Circuit Current During
Standby Operation
0.75
Fig.2 Circuit Current at Full
Fig.2 Circuit Current During
Charge Detection
Pow_Tr_ON Operation
1600
Fig.3
Circuit Current During
Pow_Tr_OFF Operation
1.5
ISEL = H
1.4
V_VCTH(V)
VPVC (V)
VCC =
Vcc=6V
6V
Vcc=5V
VCC=5V
VCC =
Vcc=2.5V
2.5V
1.2
0.50
Ta=25℃
Ta=85℃
Ipeak (mA)
1200
Ta = -35
℃
ISEL = M
1.3
800
ISEL = L
0.25
Ta=-35℃
400
1.1
0.00
1.0
-40
-10
20
50
80
Temperature (℃)
110
140
0
0.0
0.2
0.4
0.6
IPVC(A)
START(V)
0.8
1.0
1.2
-40
0
40
80
120
160
Temperature(℃)
Fig. 4
Full Charge Detection
Voltage vs Temperature
50
Fig.6
Fig.5 PVC saturation voltage
Primary-Side Peak Current
VS Temperature
200
2400
Ta=-35℃
Ta=-35℃
2000
1600
IFULL (uA)
1200
Ta=85℃
800
400
0
Ta=25℃
160
40
Ta=85℃
ICC (mA)
ISTART (uA)
120
Ta=25℃
30
20
10
0
Ta=25℃
Ta=85℃
80
40
Ta=-35℃
0
0
2
4
VSTART (V)
6
8
0
2
4
START(V)
START(V)
6
8
0.0
0.2
0.4
0.6
0.8
1.0
1.2
VFULL (V)
Fig.7
1.0
START Pin Sink Current
Fig.8
8
START pin Threshold Voltage
2.4
2.0
Fig.9
FULL Pin Sink Current
0.8
6
IVC (uA)
0.6
toff (uS)
4
RT = 30kΩ
Ω
2
RT = 100kΩ
Ω
VRT (V)
RT = 47kΩ
Ω
1.6
1.2
0.8
Ta = -35℃
Ta = 25℃
0.4
Ta=25℃
0.2
Ta=85℃
0.0
0.0
0.4
0.8
1.2
VC (V)
1.6
2.0
2.4
Ta=-35℃
Ta = 85℃
0.4
0
0.0
0.5
VC (V)
1.0
1.5
0.0
0.0
0.4
0.8
VC (V)
1.2
1.6
Fig.10
VC Pin leak Current
Fig.11
VC voltage OFF time setting
Fig.12
VC voltage VRT setting
4/16
Reference data (BD4210EKN)
1.0
FULL DETECT CURRENT : ICCW (µA)
7.0
ACTIVE AVERAGE CURRENT : ICCA(mA)
FULL DETECT CURRENT:ICCW (μA)
45
40
35
30
25
20
15
10
5
0
0
2
4
6
8
10
SUPPLY VOLTAGE : Vcc (V)
STAND-BY CURRENT : ICCS(
μ
A)
0.8
0.6
0.4
0.2
0.0
-0.2
0
2
4
6
8
10
SUPPLY VOLTAGE : Vcc (V)
6.0
5.0
4.0
3.0
Ta=25
℃
Ta=85
℃
Ta=-35
℃
Ta=-35
℃
Ta=25
℃
Ta=85
℃
2.0
1.0
0.0
0
2
SUPPLY VOLTAGE : Vcc (V)
Ta=25
℃
Ta=85
℃
Ta=-35
℃
4
6
8
10
Fig.13
SUPPLY VOLT AGE : VCC(V)
Circuit Current During
Standby Operation
Fig.14 Circuit Current at Full
SUPPLY VOLTAGE : VCC(V)
Charge Detection
SUPPLY VOLT AGE : VCC(V)
Fig. 15 Average Operating Current
Consumption
500
START PIN SINK CURRENT : ( µA)
1.535
1.530
FULL DETECT VOLTAGE
RESISTANCE VALUE : RVREF2
(Ω)
2500
2000
1500
1000
400
300
200
100
Ta=
－
35
℃
0
0
2
4
6
8
10
Ta=85
℃
Ω
RS1=0.047
Ω
1.525
1.520
1.515
1.510
1.505
-50
-25
0
25
50
75
100
I_ADJ LOWER
Ta=25
℃
VCTH(V)
Ω
RS1=0.1
Ω
500
condition : RVREF1=8.2k
Ω
Ω
0
0
500
1000
1500
2000
START PIN VOLTAGE : (V)
AMBIENT TEMPERATURE : Ta(
℃
)
PEAK CURRENT (mA)
Fig.16
START Pin Sink Current
Fig. 17
Full Charge Detection
Voltage vs Temperature
Fig.18
Primary-Side Peak
Current Setting
7.0
FULL PIN SINK CURRENT : IFULL(
μA)
12.0
Ta=-35
℃
500
Ta=-35
℃
Ta=25
℃
Ta=85
℃
PVC PIN VOLTAGE : Vpvc (V)
6.0
5.0
4.0
3.0
2.0
1.0
0.0
0
450
400
350
300
250
200
150
100
50
0
0
500
1000
1500
2000
2500
Ta=25
℃
10.0
OVP_SW PIN CURRENT (
μ
A)
8.0
6.0
4.0
2.0
0.0
Ta=25
℃
Ta=85
℃
2
4
6
0
4
8
12
FULL PIN VOLT AGE : VFULL(V)
OVP_SW PIN VOLT AGE : (V)
PVC PIN SOURCE CURRENT (mA)
Fig. 19
FULL Pin Low Voltage
Fig. 20 OVP_SW Pin Current Capacity
Fig. 21
PVC Saturation Voltage
IGBT_OUTP PIN SOURCE CURRENT(mA)
IGBT_OUTN PIN SINK CURRENT(mA)
300
250
200
150
100
50
0
0
1
2
3
4
Ta=-35
℃
Ta=25
℃
Ta=85
℃
300
IBGT_IN SINK CURRENT(
μ
A)
25
250
200
150
100
50
0
0
1
2
Ta=-35
℃
Ta=25
℃
Ta=85
℃
20
15
10
Ta=85
℃
Ta=25
℃
Ta=-35
℃
5
0
3
4
0
2
4
6
IGBT_OUTP PIN VOLTAGE:(V)
IGBT_OUTN PIN VOLTAGE:(V)
IGBT_IN VOLTAGE : VDD2(V)
Fig. 22
IGBT_OUTP Pin
Current Capacity
Fig. 23
IGBT_OUTN Pin
Current Capacity
Fig. 24 IGBT_IN Input Sink Current
5/16
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