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TK75001DIMG
Datasheet
13 pgs104.7 Kb0

TOKO TK75001DIMG Datasheet

TK75001
75001
PWM CONTROLLER
FEATURES
■ Optimized for Off-Line Operation
■ Maximum Duty Ratio 44% (typ.)
■ Maximum Clock Frequency Above 1 MHz
■ Frequency Reduction for Improved Overcurrent
Protection
■ Low Standby Current for Current-Fed Start-Up
■ Current-Mode or Voltage-Mode Control
■ Internal User-Adjustable Slope Compensation
■ Functionally Integrated & Simplified 5-pin Design
DESCRIPTION
The TK75001 is a simplified primary side controller optimized for off-line switching power supplies. It is suitable for both voltage-mode and current-mode control and has advanced features not available in controllers with a higher pin count. The key to full functionality in a 5-pin design is that the current signal and the error signal are added together and fed into the feedback pin. A sawtooth current flowing out of the feedback pin provides a slope compensation ramp (in current-mode applications) or a PWM ramp (in voltage-mode applications), in proportion to the resistance terminating that pin. If the sum of the current sense signal, error signal and ramp signal exceeds the Overcurrent Detector threshold indicating that the Current Control Detector has lost control of the switch current, the charging current of the timing capacitor will be reduced to about 25% for the remainder of the clock period. The reduced charging current causes no more than a one-third reduction in switching frequency, effectively preventing short-circuit current runaway.
The TK75001 is available in an 8-pin DIP package.
ORDERING INFORMATION
TK75001D
Tape/Reel Code Temperature Code
TEMP. CODE (OPTIONAL)
I: -40 to +85 C
TAPE/REEL CODE
MG: Magazine
APPLICATIONS
■ Off-Line Power Supplies
■ Industrial Power Supplies
■ Telecom Power Supplies
■ Off-Line Battery Chargers
TK75001
DRV
GND NC
Note: Pins 2 and 3 must be externally connected for proper operation.
BLOCK DIAGRAM
I
CT
C
T
FB
I
FR
1.35 V
0.98 V
I
CHG
I
DS
2 mA
Q
SLOPE
COMPENSATION
OSCILLATOR
R
FREQUENCY REDUCTION
LATCH
S
OVERCURRENT
DETECTOR
CURRENT CONTROL
DETECTOR
GND
T
BANDGAP
REFERENCE
f
CLK
TOGGLE FF
TQ
PWM LATCH
S
R
V
CC
NC
FBC
V
CC
UVLO
14.5 V
10.5 V
Q
GND
17.5 V
DRV
January 1999 TOKO, Inc. Page 1
TK75001
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (Low Impedance Source)................ 16 V
Supply Voltage (ICC < 30 mA) ...................... Self Limiting
Power Dissipation (Note 1) ................................ 825 mW
Output Energy (Capacitive Load).............................. 5 µJ
CT and FB Pins ........................................................ 16 V
TK75001 ELECTRICAL CHARACTERISTICS
Test Conditions: VCC = 13 V, CCC = 4.7 µF, CT = 800 pF, C Typical numbers apply at TA = 25 °C, unless otherwise specified.
LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU
Junction Temperature ...........................................150 °C
Storage Temperature Range ................... -55 to +150 °C
Operating Temperature Range ...................-20 to +80 °C
Extended Temperature Range................... -40 to +85 °C
Lead Soldering Temperature (10 s) ......................235 °C
= 1000 pF, TA = Tj = Full Operating Temperature Range.
DRV
I I
V V V V
)TRATS(CC
)NO(CC
)NO(CC
)FFO(CC
TSYH
)PMALC(CC
siseretsyHOLVU 8.20.4V
C(NOITCESROTALLICSO
f
VRD
V
)KP(TC
V
)LV(TC
I
)SID(TC
C
)XAM(T
egatloVkaeP 5.22.39.3V
egatloVyellaV 1.1V
tnerruCylppuSpu-tratSVotecruoStnerruC
tnerruCylppuSgnitarepO 5.410.91Am
NOegatloVOLVUVCC)3etoN(,drawpUspeewS5.215.410.61V
FFOegatloVOLVUV
egatloVpmalClanretnII
)NIP
T
niPVRDtaycneuqerF
CC
T
AT=j
T
AT=j
CC
C°52=440565zHk
tnerruCegrahcsiD 0.18.10.3Am
ecnaticapaCgnimiTmumixaM 7.4Fn
niP5.00.1Am
CC
drawnwoDspeewS0.95.010.21V
)3etoN(,Am52=0.615.710.91V
)C°08ot02-(egnaRlluF=7336zHk
)NIPBF(SNOITCESNOITCUDERYCNEUQERFDNAKCABDEEF,ROTCETEDTNERRUC
T
V
DCC
V
DCO
t
DP,CO,BF
t
DP,CC,BF
i
)KP(CS
tnerruC
rotceteDlortnoCtnerruC
egatloVecnerefeR
rotceteDtnerrucrevO
egatloVecnerefeR
kaePnoitasnepmoCepolS
AT=j
T
AT=j
T
AT=j
T
AT=j
niPVRDotyaleDnoitagoporPV
BF
niPVRDotyaleDnoitagoporPVBF)4etoN(,V02.1ot0morfspetS08081sn
V=
V
TC
C°52=059.0089.0010.1V
)C°08ot02-(egnaRlluF=529.0530.1V
C°52=023.1053.1083.1V
)C°08ot02-(egnaRlluF=503.1593.1V
V2ot0morfspetS06031sn
)KP(TC
T,
AT=j
)2etoN(,C°52=542-002-551-Aµ
i
)LV(CS
i
)LV-KP(CS
tnerruC
yellaV
yellaVnoitasnepmoCepolS
otkaePnoitasnepmoCepolS
V=
V
TC
V=
V
TC
)LV(TC
)LV(TC
T,
AT=j
T,
AT=j
)2etoN(,C°52=56-04-51-Aµ
)2etoN(,C°52=002-061-021-Aµ
Page 2 January 1999 TOKO, Inc.
TK75001 ELECTRICAL CHARACTERISTICS (CONT.)
Test Conditions: VCC = 13 V, CCC = 4.7 µF, CT = 800 pF, C Typical numbers apply at TA = 25 °C, unless otherwise specified.
LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU
= 1000 pF, TA = Tj = Full Operating Temperature Range.
DRV
)GNIMITNOITCETORPTNERRUCREVO(RECUDERYCNEUQERF
TK75001
f
f/
)RF(VRD
VRD
oitaR
noitcudeRycneuqerF
V
BF
V6.1,V2.1=536455%
)NIPVRD(NOITCESTUPTUO
D t t
V
V
Note 1: Power dissipation is 825 mW when mounted. Derate at 6.6 mW/°C for operation above 25 °C. Note 2: For temperature dependence refer to "Slope Compensation Peak Current vs. Temperature" graph. Note 3: The UVLO "on" voltage is guaranteed to be below the internal clamp voltage. Note 4: Guaranteed by design; not 100% tested.
)XAM(VRD
)ESIR(VRD
)LLAF(VRD
)HGIH(VRD
)WOL(VRD
emiTesiRV,daolFp0001
emiTllaFV,daolFp0001
oitaRytuDmimixaM044484%
CC
CC
I
HGIHegatloVtuptuO
WOLegatloVtuptuO
VRD
I
VRD
I
VRD
I
VRD
I
VRD
Am04-=1.010.11V
Am001-=0.018.01V
Am04=1.052.0V
Am001=2.005.0V
,Am5=VCCV9=0.105.1V
V51=5257sn V51=5257sn
January 1999 TOKO, Inc. Page 3
TK75001
TEST CIRCUIT
(mA)
CC
I
0.6
0.4
20
16
12
SUPPLY CURRENT
VS.
SUPPLY VOLTAGE
DEVICE ON
STANDBY
OSCILLOSCOPE
1000 pF
C
800 pF
DRV
GND
GND
T
OSCILLOSCOPE
T
V
CC
NC
NC
FBC
1 µF
20 k
C
CC
4.7 µF
TYPICAL PERFORMANCE CHARACTERISTICS
FREQUENCY AT DRV PIN
TIMING CAPACITANCE
6
10
5
10
TA = 85 °C
4
10
FREQUENCY (Hz)
TA = -40 °C
VS.
CURRENT CONTROL REFERENCE
1.00
0.98
(V)
0.96
CCD
V
0.94
0.92
VS.
TEMPERATURE
0.0 0 4 8 12 16 18
VCC (V)
SLOPE COMPENSATION PEAK
CURRENT
VS.
TEMPERATURE
10
10 100 1000 10000
CT (pF)
INPUT CURRENT
VS.
FREQUENCY AT DRV
0.90
-40 0 40 80 120 TEMPERATURE (°C)
FREQUENCY REDUCTION RATIO
TEMPERATURE
3
54
-100
30
50
-140
(µA)
-180
SC(PK)
i
-220
-260
-40 0 40 80 120 TEMPERATURE (°C)
26
C
DRV
= 1 nF
(mA)
22
CC
I
C
DRV
18
C
= 0 nF
DRV
14
0 200 400 600 800
FREQUENCY (kHz)
= 500 pF
48
44
40
FREQ. REDUCTION RATIO (%)
36
-40 0 40 80 120 TEMPERATURE (°C)
Page 4 January 1999 TOKO, Inc.
VS.
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