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 Voltage Regulators
AN8013SH
Single-channel step-up or step-down DC-DC converter control IC
Unit: mm
s Overview
The AN8013SH is a single-channel PWM DC-DC converter control IC. This IC implements DC-DC converters that provide a single arbitrary output voltage that is either a stepped-up or stepped-down level. It features a wide operating supply voltage range, low power, and a built-in overcurrent protection circuit to protect the switching transistor from damage or destruction. The AN8013SH is provided in a 0.5 mm pitch 10-pin surface mounting package and is optimal for use in miniature high-efficiency portable power supplies.
3.00.30 1.50.2
1
10
0.20.1 0.6250.10 0.6250.10
0.5
5
6
0.10.1
0.50.2 4.30.30 6.30.30
s Features
* Wide operating supply voltage range (3.6 V to 34 V) * Small consumption current (2.4 mA typical) s Pin Descriptions * Supports control over a wide output frequency range: 20 kHz to 500 kHz. CLM 1 * Built-in pulse-by-pulse overcurrent protection circuit 2 RT 3 CT (Detection voltage: VCC - 100 mV) S.C.P. 4 * Built-in timer latch short-circuit protection circuit DTC 5 (charge current 1.3 A typical) * Incorporating the under-voltage lock-out (U.V.L.O.) circuit * Built-in reference voltage circuit (Error amplifier reference input: 0.75 V (allowance: 4%)) * Output block is open-collector (darlington) type. * High absolute maximum rating of output current (100 mA) * Duty ratio with small sample-to-sample variations (55% 5%). * Adopts a 0.5-mm lead pitch 10-pin small outline package
SSOP010-P-0225
0.15-0.05
+0.1
10 VCC 9 Out 8 GND 7 IN- 6 FB
s Applications
* Switching mode power supply units (in portable equipment and other applications)
1
AN8013SH
s Block Diagram
Voltage Regulators
1 CLM
10 V CC
5 DTC
3 CT
OSC VREF VREF FB 6 0.1 V SR Latch VREF RT Error amp. VREF 8 GND IN- 7 S.C.P. comp. 0.75 V SR Latch R S Q U.V.L.O. RT PWM 9 Out
0.75 V
1.90 V
S.C.P. 4
s Absolute Maximum Ratings at Ta = 25C
Parameter Supply voltage CLM pin allowable application voltage Error amplifier allowable input voltage DTC pin allowable input voltage Out pin allowable application voltage Collector output current Power dissipation (Ta = 85C) Operating ambient temperature Storage temperature Symbol VCC VCLM VIN- VDTC VOUT IOUT PD Topr Tstg Rating 35 35 -0.3 to +2.5 2.5 35 100 154 -30 to +85 -55 to +150 Unit V V V V V mA mW C C
s Recommended Operating Range at Ta = 25C
Parameter Supply voltage rise time (0 to 3.6 V) Collector output voltage Collector output current Timing capacitance Timing resistance Oscillator frequency Short-circuit protection time constant setting capacitor Symbol tr (VCC) VOUT IOUT CT RT fOUT CSCP Min 10 100 5.1 20 1 000 Max 34 50 1 800 15 500 Unit s V mA pF k kHz pF
2
2 RT
Voltage Regulators
s Electrical Characteristics at Ta = 25C
Parameter U.V.L.O. block Circuit operation start voltage Hysteresis width Error amplifier block Input threshold voltage Line regulation with input fluctuation Input bias current High-level output voltage Low-level output voltage Input threshold voltage temperature characteristics 1 Input threshold voltage temperature characteristics 2 Output sink current Output source current Open-loop gain PWM Comparator Block Input threshold voltage: high Input threshold voltage: low Input current Output block Oscillation frequency Output duty Output saturation voltage Output leak current RT pin voltage Maximum oscillation frequency Frequency supply voltage characteristics Frequency temperature characteristics 1 Frequency temperature characteristics 2 fOUT Du VOL ILEAK VRT fOUT(max) RT = 5.1 k, CT = 120 pF fdV fdT1 fdT2 fOUT = 200 kHz, VCC = 3.6 V to 34 V fOUT = 200 kHz, Ta = -30C to +25C fOUT = 200 kHz, Ta = 25C to 85C RT = 15 k, CT = 150 pF RDTC = 91 k IO = 50 mA, RT = 15 k VCC = 34 V, when output Tr is off 185 50 205 55 0.9 0.59 500 1 3 3 VDT-H VDT-L IDTC Duty: 100% Duty: 0% 1.2 -12 -11 ISINK Vdt2 VTH Vdv IB VEH VEL Vdt1 Voltage follower, Ta = -30C to +25C Voltage follower, Ta = -25C to +85C VFB = 0.9 V 8 -120 70 1 Voltage follower Voltage follower, VCC = 3.6 V to 34 V -500 2.0 -25 1 0.72 0.75 2 VUON VHYS 2.8 100 3.1 200 Symbol Conditions Min Typ
AN8013SH
Max
Unit
3.4 300
V mV
0.78 8 0.3 0.6 -10
mV mV nA V V % %
mA A dB
ISOURCE VFB = 0.9 V AV
V V A
225 60 1.2 10
kHz % V A V kHz % % %
Note) At VCC = 12 V, RT = 15 k, CT = 15 pF, unless otherwise specified.
3
AN8013SH
s Electrical Characteristics at Ta = 25C (continued)
Parameter Short-circuit protection circuit block Input threshold voltage Input standby voltage Input latch voltage Charge current Comparator threshold voltage Overcurrent Protection Block Input threshold voltage Delay time Whole device Total consumption current 1 Total consumption current 2 ICC ICC2 RT = 15 k RT = 5.1 k, CT = 150 pF VCLM tDLY VTHPC VSTBY VIN ICHG VTHL VSCP = 0 V Symbol Conditions
Voltage Regulators
Min
Typ
Max
Unit
0.70 -1.6
0.75 -1.3 1.90
0.80 120 120 - 1.0
V V mV A V
VCC - 120 VCC - 100 VCC - 80 200
mV ns
2.4 3.4
3.5
mA mA
Note) At VCC = 12 V, RT = 15 k, CT = 15 pF, unless otherwise specified.
s Terminal Equivalent Circuits
Pin No. 1 Pin CLM I/O I Function Detects the overcurrent state in switching transistor. Insert a resistor with a low resistance between this pin and VCC to detect overcurrent states. When this pin falls to a level 100 mV or more lower than VCC, the PWM output is turned off for that period thus narrowing the width of the on period. (This implements a pulse-by-pulse overcurrent protection technique.) Connection for the timing resistor that determines the oscillator frequency. Use a resistor in the range 5.1 k to 15 k. Thus the pin voltage will be about 0.59 V. Internal equivalent circuit
VCC
0.1 V
1
CLM comp.
50 A
50 A
2
RT
I
VREF
100
OSC
PWM S.C.P. DTC
2
RT (V 0.59 V)
3
CT
O
Connection for the timing capacitor that determines the oscillator frequency. Use a capacitor in the range 100 to 1 800 pF. See the "Application Notes, [2] and [3]" sections later in this document for details on setting the frequency. Use an oscillator frequency in the range 20 kHz to 500 kHz.
VREF
To PWM input OSC comp. IO
3
2IO
4
Voltage Regulators
s Terminal Equivalent Circuits (continued)
Pin No. 4 Pin S.C.P. I/O O Function Connection for the capacitor that determines the time constant for soft start and the timer latch short-circuit protection circuit. Use a capacitor with a value of 1 000 pF or higher. The charge current ICHG is determined by the timing resistor RT, and sample-to-sample and temperature variations can be suppressed. When RT is 15 k, the current will be about -1.3 A. VRT 1 x ICHG = [A] RT 30 Connection for the resistor and capacitor that determine the PWM output dead-time and the soft start period. The input current IDTC is determined by the timing resistor RT, and sample-to-sample and temperature variations can be suppressed. When RT is 15 k, the current will be about -11 A. VRT 1 x ICHG = [A] RT 3.6 Error amplifier output A source current is about -120 mA and a sink current is about 8 mA. Correct the gain and the phase frequency characteristics by inserting a resistor and a capacitor between this pin and IN-pin. Error amplifier inverting input For common-mode input, use in the range - 0.1 V to +0.8 V.
AN8013SH
Internal equivalent circuit
VREF ICHG Latch
S U.V.L.O. Q 0.75 V R
4
5
DTC
I
VREF IDTC
U.V.L.O.
CT
PWM
5
6
FB
O
VREF
120 A CT 8 mA PWM
6
7
IN-
I
VREF
0.75 V
7
8
GND
Ground 8
5
AN8013SH
s Terminal Equivalent Circuits (continued)
Pin No. 9 Pin Out I/O O Function Open-collector (darlington) output The absolute maximum rating for the output current is 100 mA. Use with a constant output current under 50 mA.
Voltage Regulators
Internal equivalent circuit
VREF
9
10
VCC
Power supply connection Provide the operating supply voltage in the range 3.6 V to 34 V.
10
s Application Notes
[1] Main characteristics Error amplifier input threshold voltage temperature characteristics
0.760 VCC = 12 V Voltage follower
Maximum duty ratio temperature characteristics
60 VCC = 12 V CT = 200 pF RT = 15 k
Input threshold voltage VTH (V)
0.758
Maximum duty ratio Dumax (%)
-40 -20
58
0.756
56
0.754
54
0.752
0.750
52
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Ambient temperature Ta (C)
Ambient temperature Ta (C)
Oscillator frequency temperature characteristics
215 VCC = 12 V CT = 200 pF RT = 15 k
Timing capacitance Oscillator frequency
1M VCC = 12 V Ta = 25C
Oscillator frequency fOUT (kHz)
210
Oscillator frequency fOUT (Hz)
RT = 5.1 k 100k
205
200
RT = 15 k
195
-40
-20
10k
0 20 40 60 80 100
100
1 000
10 000
Ambient temperature Ta (C)
Timing capacitance CT (pF)
6
Voltage Regulators
s Application Notes (continued)
[1] Main characteristics (continued) Input threshold voltage line regulation
0.765 Ta = 25C
AN8013SH
Total consumption current line regulation
4.0 Ta = 25C
0.760
Total consumption current ICC (mA)
Input threshold voltage VTH (V)
3.5 RT = 5.1 k
0.755
3.0
0.750
2.5
RT = 15 k
0.745 0 5 10 15 20 25 30 35
2.0 0 5 10 15 20 25 30 35
Supply voltage VCC (V)
Supply voltage VCC (V)
Timing resistance Total consumption current
3.5 VCC = 12 V Ta = 25C
Timing resistance Output saturation voltage
0.85 VCC = 12 V IO = 50 mA Ta = 25C 0.84
Total consumption current ICC (mA)
3.0
Output saturation voltage VOL (V)
4 8 12 16 20
0.83
0.82
2.5
0.81
2.0
0.80 4 8 12 16 20
Timing resistance RT (k)
Timing resistance RT (k)
7
AN8013SH
s Application Notes
[2] Function descriptions
Voltage Regulators
1. Reference voltage block The reference voltage block is based on a band gap circuit, and outputs a temperature corrected reference voltage of 2.5 V. This reference voltage is stabilized once the supply voltage exceeds 3.6 V, and is used as the power supply for the IC itself. 2. Triangular wave generator This circuit generates a triangular wave with a peak of about 1.45 V and a trough of about 0.35 V using a timing capacitor connected to the CT pin (pin 3) and a timing resistor connected to the RT pin (pin 2) respectively. The oscillator frequency can be set to arbitrary value by selecting appropriate values for the external capacitor and resistor, CT and RT. The triangular wave signal is provided to the inverting input the PWM comparator internally to the IC. 3. Error amplifier FB This circuit is an PNP-transistor input error ampli6 VOUT fier that detects and amplifies the DC-DC converter Internal 2.5 V output voltage, and inputs that signal to a PWM comreference voltage parator. PWM R3 R1 A 0.75 V level is created by resistors dividing the Error amp. comparator input 0.75 V internal reference voltage. This level is applied to the IN- noninverting input. 7 R4 Arbitrary gain and phase compensation can be set R2 up by inserting a resistor and capacitor in series between the error amplifier output pin (pin 6) and the inverting input pin (pin 7). Figure 1. Connection method of error amplifier The output voltage VOUT is given by the following formula by connecting a resistor divider to the output as shown in figure 1. R1 + R2 VOUT = 0.75 x R2 4. Timer latch short-circuit protection circuit This circuit protects the external main switching element, flywheel diode, choke coil, and other components against degradation or destruction if an excessive load or a short circuit of the power supply output continues for longer than a certain fixed period. The timer latch short-circuit protection circuit detects the output of the error amplifier. If the DC-DC converter output voltage drops and an error amplifier output level exceeds 1.90 V, this circuit outputs a low level and the timer circuit starts. This starts charging the external protection circuit delay time capacitor. If the error amplifier output does not return to the normal voltage range before that capacitor reaches 0.75 V, the latch circuit latches, the output drive transistors are turned off, and the dead-time is set to 100%.
RNF
5. Low input voltage malfunction prevention circuit (U.V.L.O.) This circuit protects the system against degradation or destruction due to incorrect control operation when the power supply voltage falls during power on or power off. The low input voltage malfunction prevention circuit detects the internal reference voltage that changes with the supply voltage level. While the supply voltage is rising, this circuit cuts off the output drive transistor until the reference voltage reaches 3.1 V. It also sets the dead-time to 100%, and at the same time holds the S.C.P. pin (pin 4) at the low level. During the fall time of the power supply voltage, it has hysteresis width of 200 mV and operates 2.9 V or less.
8
CNF
Voltage Regulators
s Application Notes (continued)
[2] Function descriptions (continued)
AN8013SH
6. PWM comparator The PWM comparator controls the output pulse on-period according to the input voltage. The output transistor is turned on during periods when the level of the CT pin (pin 3) triangular wave is lower than both of the error amplifier output (pin 6) and the DTC pin (pin 5) voltage. The dead-time is set by adding a resistor between the DTC pin and ground. Additionally, the AN8013SH can provide soft start operation in which the output pulse on-period is gradually lengthened according to an RC time constant when power is first applied by adding a capacitor in parallel with the resistor RDTC. 7. Overcurrent protection block Destruction of the main switching device, the flywheel diode, and the choke coil, which are easily damaged by overcurrents, is prevented by limiting the maximum current that flows in the switching device. This is implemented using the fact that power supply output overcurrents are proportional to the current flowing in the main switching device (a bipolar transistor). The AN8013SH detects the current by connecting a resistor with a low resistance between the main switching device and the VCC pin and monitoring the voltage drop across this resistor at the CLM pin (pin 1). When the main switching device (a bipolar transistor) is on and the CLM pin voltage reaches VCC minus 100 mV, which is the overcurrent detection threshold voltage, the AN8013SH shuts off the output transistor, thus controlling the main switching device so that currents in excess of the limit cannot occur. While this control operation is repeated at each period, once an overcurrent is detected the output transistor is turned off for the remainder of that period and is not turned on again until the next period. This type of overcurrent protection is called pulse-by-pulse overcurrent protection. 8. Output block The output drive transistor is of open-collector type output in which transistors are darlington-connected with a grounded common emitter. The breakdown voltage of collector output terminal (pin 5) is 34 V and it is possible to obtain up to 100 mA output current.
Output off
5 On at the next period
3
Triangle wave (CT) Error amplifier output (FB)
1.4 V 0.4 V
High Output transistor collector waveform (Out) Low
Overcurrent protection input (CLM)
VCC VCC - 100 mV
1 2
Overcurrent detection Latch set TDLY : Delay time High Low High
Latch circuit set signal
Latch circuit reset signal
4
Low Latch reset
Figure 2. Pulse-by-pulse overcurrent protection operating waveforms
9
AN8013SH
s Application Notes (continued)
[3] Triangular wave oscillation circuit
Voltage Regulators
1. Setting the oscillator frequency The waveform of triangular wave oscillation is obtained by charging and discharging of the constant current IO from the external timing capacitor CT which is connected to CT pin (pin 3). The constant current is set by the externally attached timing resistor RT. The peak value of the wave VCTH and the trough value of the wave VCTL are fixed at about 1.45 V typical and 0.35 V typical respectively. The oscillator frequency fOSC is obtained by the following formula: 1 IO VCTH = 1.4 V typ. fOSC = = t1 + t 2 2 x CT x (VCTH - VCHL) whereas IO = 1.8 x VRT 0.59 = 1.8 x RT RT
t1 t2
VCTL = 0.37 V typ.
Charging Discharging
because VCTH - VCTL = 1.1 V 1 fOSC = [Hz] 2.07 x CT x RT
T
Figure 3. Triangular wave oscillation waveform The output frequency fOUT is equal to fOSC since it is PWM-controlled.
2. Usage notes This IC uses the constant current given by the timing resistor RT as the bias current of the triangular wave generator and the PWM comparator for consumption current reduction. The total consumption current is about 2.4 mA typical when RT is 15 k, and it increases to about 3.4 mA typical when RT is 5.1 k. In order to obtain the constant output current of 100 mA at the open-collector output, it is necessary to set RT value to 15 k or smaller. It is possible to use the circuit in the recommended operating range of 20 kHz to 500 kHz of the oscillator frequency. As the AN8013SH is used at increasingly higher frequencies, the amount of overshoot and undershoot due to the operation delay in the triangular wave oscillator comparator increases, and discrepancies between the values calculated as described previously and the actual values may occur. See the timing capacitance - oscillator frequency relationship in the "Application Notes, [1] Main characteristics" section of this document. Note that this IC can not be used as an IC for slave when the several ICs are operated in parallel synchronous mode. [4] Setting the dead-time (maximum duty) The dead-time is set, as shown in figure 4, by setting the DTC pin (pin 5) voltage, VDTC. Since the DTC pin has a constant current output set with the resistor RT, VDTC is adjusted by adding the external resistor RDTC. The output duty, Du, and the DTC pin voltage, VDTC, are expressed by the following formulas. For an oscillator frequency of 200 kHz, the output duty will be 0% at VDTC = 0.45 V, and 100% at VDTC = 1.45 V. However, care is required here, since the amount of overshoot and undershoot in the triangular wave peak (VCTH) and minimum (VCTL) values depends on the oscillator frequency.
10
Voltage Regulators
s Application Notes (continued)
[4] Setting the dead-time (maximum duty) (continued)
AN8013SH
CT waveform DTC waveform
VCTH VDTC VCTL tOFF tON
VREF IDTC IDTC = VRT x 1 [A] RT 3.6 PWM CT FB
OUT waveform
DTC Off On Off RDTC tON Du = x 100 [%] tON + tOFF VCTH -VDTC x 100 [%] = VCTH -VCTL VDTC = IDTC x RDTC = VRT x RDTC 1 x [V] RT 3.6 Figure 4. Setting the dead-time CDTC
Example: When fOSC = 200 kHz (RT = 15 k, CT = 150 pF) VCTH 1.45 V (typ.) VRT 0.59 V (typ.) VCTL 0.35 V (typ.) IDTC 11 A (typ.)
Adding the external resistor RDTC and the capacitor CDTC in parallel implements a soft start function that causes the output pulse on width to increase gradually when the power supply is started. Use of this function can prevent DC-DC converter output overshoot. [5] Setting the time constant of the timer latch short-circuit protection circuit The structural block diagram of protection latch circuit is shown in figure 5. The comparator for short-circuit protection compares the output of error amplifier VFB with the reference voltage of 1.90 V all the time. When the load conditions of DC-DC converter output are stabilized, there is no fluctuation of error amplifier output, and the short-circuit protection comparator also keeps the balance. At this moment, the output transistor Q1 is in the conductive state and the S.C.P. pin is hold to about 30 mV through the clamp circuit. When the load conditions suddenly change, and high-level signal (1.90 V or higher) is input from the error amplifier to the non-inverted input of the short-circuit protection comparator, the short-circuit protection comparator outputs the low-level signal. Since this signal cuts off the output transistor Q1, the S.C.P. pin voltage VPE is released, and the externally connected capacitor CS starts charging according to the following equation : When the external capacitor CS has been charged up to about 0.75 V, it sets the latch circuit, cuts off the output drive transistor by enabling the low input voltage malfunction prevention circuit, and sets the dead-time at 100%. tPE VPE = VSTBY + ICHG x [V] CS 0.75 V = 0.03 V + ICHG x CS = ICHG x tPE [F] 0.72 tPE CS
11
AN8013SH
s Application Notes (continued)
Voltage Regulators
[5] Setting the time constant of the timer latch short-circuit protection circuit (continued) ICHG is the constant current determined by the oscillation timing resistor RT, and its dispersion and fluctuation with temperature are small. ICHO is expressed in the following equation : ICHG = VRT RT x 1 30 [A]
VRT is about 0.5 V and ICHO becomes about 1.1 A at RT = 15 k. Once the low input voltage malfunction prevention circuit is enabled, the S.C.P. pin voltage is discharged to about 30 mV but the latch circuit is not reset unless the power is turned off.
VREF ICHG FB 6 Error amp. IN- 7 0.75 V 0.75 V S.C.P. comp. Q1 Q2 1.90 V
4
PWM comparator input
SR Latch
R U.V.L.O.
Output cut-off
S.C.P. CS
Figure 5. Short-circuit protection circuit
When the power supply is started, the output appears to be shorted. The error amplifier output goes to the high state, the S.C.P. pin voltage, VPE, is released, and charging starts. The external capacitor value must be set so that DCDC converter voltage output starts before the latch circuit in the later stage is set. If the soft start function is used, special care is required to assure that the start time does not become excessive.
12
Voltage Regulators
s Application Notes (continued)
[6] Timing chart
VCC (0 V3.6 V) rise time tr (VCC) 10 [s] 3.1 V typ. Lock-out release
AN8013SH
Supply voltage (VCC)
3.6 V 2.5 V
Internal reference voltage
Error amplifier output (FB)
1.90 V
Triangular wave (CT) Power supply on DTC pin voltage
1.40 V
0.40 V 0.03 V High Low
Soft start operation Maximum duty
S.C.P. pin voltage Output transistor collector waveform (Out)
Figure 6. PWM comparator operation waveform
Internal reference voltage
2.5 V
Short-circuit protection input threshold level Comparator threshold level
1.90 V
Dead-time voltage (VDT) Error amplifier output (FB) Triangular wave(CT)
1.40 V 0.40 V
High
Output transistor collector waveform (Out)
Low 0.75 V 0.03 V tPE High Low
S.C.P. pin voltage Short-circuit protection comparator output
Figure 7. Short-circuit protection operation waveform
13
AN8013SH
s Application Circuit Examples
1. Step-down circuit
In 62 k SBD 11 k 100 k
Voltage Regulators
Out +5 V
10 VCC
8 GND
7 IN-
9 Out
6 FB
0.001F
f = 200 kHz Dumax = 80% RDTC = 110 k
CLM 1 RT 2 CT 3 S.C.P. 4 DTC 5
0.033 F 110 k
15 k
150 pF
0.01 F
2. Step-up circuit
In SBD 150 k 10 k 100 k Out +12 V
8 GND
10 VCC
7 IN-
9 Out
6 FB
0.001 F
f = 200 kHz Dumax = 80% RDTC = 110 k
CLM 1 RT 2 CT 3 S.C.P. 4 DTC 5
0.033 F 110 k
15 k
150 pF
0.01 F
14
Voltage Regulators
s Application Circuit Examples (continued)
3. On/off circuit example 1) Cutting the power supply line
In Q1 Q3 SBD VO
AN8013SH
10 VCC
7 IN-
9 Out
C10 Q2 On/off
CLM 1
RT 2
CT 3
S.C.P. 4
Standby current 0 A
2) Cutting the IC VCC line
In Q1
10 VCC 9 Out
Q3 SBD
7 IN- 6 FB
DTC 5
6 FB
ICC
8 GND
VO
ICC
C10 Q2 On/off
CLM 1
RT 2
CT 3
8 GND
S.C.P. 4
Standby current 0 A
4. Usage Since this IC does not include an on/off circuit, an external circuit must be added to implement a standby function. If a switch (Q1) is inserted in the power supply line as shown in on/off circuit example 1, the standby current can be held to 0. In this circuit, a transistor essentially equivalent to the one used for the main switching device (Q3) is required. If a switch (Q1) is inserted between the power supply line and the IC VCC pin (pin 10) as shown in on/off circuit example 2, the size of the switching device (Q1) can be reduced. However, the sample-to-sample variations in the Q1 saturation voltage will result in sample-to-sample variations in the overcurrent protection threshold level. 5. Usage Notes If an external on/off circuit is added, the VCC rise time may become excessively steep and the IC internal latch circuit may be set at that time, causing problems at power supply startup. To avoid such problems, set the value of C10 so that the VCC (pin 10) rise time is at least 10 s.
DTC 5
15


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