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R1245L003F Schematic ( PDF Datasheet ) - Richo

Teilenummer R1245L003F
Beschreibung 30 V Step Down DC/DC Converter
Hersteller Richo
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Gesamt 46 Seiten
R1245L003F Datasheet, Funktion
R1245x Series
AEC-Q100 Grade 2 Certified
1.2 A, 30 V Step Down DC/DC Converter for Automotive Applications
NO. EC-269-140311
OUTLINE
The R1245x is a Step-down DC/DC converter with internal N-channel high side Tr. That is developed with
CMOS process technology. The ON resistance of the built-in high-side transistor is 0.35 Ω and the R1245x can
provide the maximum 1.2 A output current. Each of the ICs consists of an oscillator, a PWM control circuit, a
voltage reference unit, an error amplifier, a phase compensation circuit, a slope compensation circuit, a soft-start
circuit, protection circuits, an internal voltage regulator, and a switch for bootstrap circuit. The ICs can make up a
step-down DC/DC converter with an inductor, resistors, a diode, and capacitors.
The R1245x is a current mode operating type DC/DC converter without an external current sense resistor, and
realizes fast response and high efficiency. As an output capacitor, a ceramic type capacitor can be used with the
R1245x. The options of the internal oscillator frequency are preset at 330 kHz for version A and B, 500 kHz for
version C and D, 1000 kHz for version E and F, 2400 kHz for version G and H.
As for protection, an Lx peak current limit circuit cycle by cycle, a thermal shutdown function and an under
voltage lockout (UVLO) function are built in. Furthermore, there are two types for short protection, for A/C/E/G
version, a latch protection function which makes the output latch off if the output voltage keeps lower than the set
output voltage for a certain time after detecting current limit is built in, for B/D/F/H version, a fold-back protection
function which changes the oscillator frequency slower after detecting short circuit or equivalent.
As for the packages of the R1245x, HSOP-8E and DFN2020-8 are available.
FEATURES
Input Voltage Range (Maximum Rating) ················ 4.5 V to 30 V (32 V)
Operating Temperature ······································ 40°C to 105°C
Internal N-channel MOSFET Driver ······················ RON = 0.35 Ω Typ.
Adjustable Output Voltage with External Resistor····· 0.8 V or more
Feedback Voltage and Tolerance ························· 0.8 V±1.0%
Peak Current Limit ············································ Typ. 2.0 A
UVLO Function Released Voltage ························ Typ. 4.0 V
Operating Frequency········································· 330 kHz (A/B version), 500 kHz (C/D version),
1000 kHz (E/F version), 2400 kHz (G/H version)
Fold-back Protected Frequency ··························· 170 kHz (B/D version), 250 kHz (F version),
400 kHz (H version)
Latch Protection Delay Time ······························· Typ. 4 ms for A/C/E/G version
Built-in Thermal Shutdown Circuit ························ Typ. 160°C
Ceramic Capacitors Recommended for Input and Output
Stand-by Current ·············································· Typ. 0 μA
Packages ······················································· HSOP-8E, DFN2020-8
AEC-Q100 Certified Product Package Type············ HSOP-8E
APPLICATIONS
Power source for car accessories including car audio equipment, car navigation system, and ETC system.
Power source for control units including EV inverter and charge control.
1
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R1245L003F Datasheet, Funktion
R1245x
NO. EC-269-140311
ELECTRICAL CHARACTERISTICS
VIN = 12 V, unless otherwise noted.
The specifications surrounded by
are guaranteed by design engineering at –40°C Ta 105°C.
R1245x003x-AE
Symbol Item
IIN VIN Consumption Current
VUVLO1 UVLO Detect Voltage
VUVLO2 UVLO Released Voltage
VFB VFB Voltage Tolerance
fosc Oscillator Frequency
fFLB Fold-back Frequency
Maxduty Oscillator Maximum. Duty Cycle
tstart
tDLY
Soft-start Time
Delay Time for Latch Protection
Conditions
VIN = 30 V, VFB = 1.0 V
Falling
MIN. TYP.
0.5
3.55
VUVLO2
-0.2
(T a = 25 °C)
MAX. Unit
1.80 mA
VUVLO2
-0.05
V
Rising
3.75 4.0 4.25
V
Ta = 25°C
–40°C Ta 105°C
Ta = 25°C
Version
A/B –40°C Ta
105°C
Ta = 25°C
Version
C/D –40°C Ta
105°C
Version
E/F
Version
G/H
Ta = 25°C
–40°C Ta
105°C
Ta = 25°C
–40°C Ta
105°C
Version
B
VFB < 0.56 V
Version
D
VFB < 0.56 V
Version
F
Version
H
VFB < 0.56 V
VFB < 0.56 V
Version A/B
Version C/D
Version E/F
Version G/H
VFB = 0.72 V
Version A/G
0.792
0.781
300
0.800 0.808
0.819
330 360
280 380
450 500 550
430 590
900
870
2200
1000 1 100
1140
2400 2600
2150
2650
170
170
250
400
91
91
86
74
1.0
4
V
kHz
kHz
%
ms
ms
6

6 Page









R1245L003F pdf, datenblatt
R1245x
NO. EC-269-140311
The performance of power circuit using this IC largely depends on external components. Selection of external
components is very important, especially, do not exceed each rating value (voltage/current/power).
Recommended values for each output voltage
R1245x003A/B: 330 kHz
VOUT (V)
0.8 to
1.2
1.2 to
2.5
2.5 to
5.0
R1 (RUP) (k) =
(VOUT / 0.8-1) × R2
R2 (RBOT) (k)
16 12
1.20
CSPD (pF)
open 470
2200
COUT (μF)
47 47
22
L (μH)
4.7 10
15
5.0
1.20
1000
22
33
R1245x00xC/D: 500 kHz
VOUT (V)
0.8 to
1.2
R1(RUP) (k) =
R2(RBOT) (k)
16
CSPD (pF)
open
COUT (μF)
100
L (μH)
4.7
1.2 to
1.5
16
100
100
4.7
1.5 to
2.0
2.0 to
5.0
(VOUT / 0.8-1) × R2
16 1.2
100 1000
22 22
10 10
5.0 to
12.0
1.2
1000
22
15
R1245x00xE/F: 1000 kHz
VOUT (V)
0.8 to
1.0
R1 (RUP) (k) =
R2 (RBOT) (k)
16
CSPD (pF)
open
COUT (μF)
100
L (μH)
2.2
1.0 to
1.2
16
100
100
2.2
1.2 to
1.5
1.5 to
2.5
(VOUT / 0.8-1) × R2
16 16
100 100
47 22
2.2 2.2
2.5 to
5.0
1.2
470
10
4.7
R1245x003G/H: 2400 kHz
VOUT (V)
1.5 to
1.8
R1(RUP) (k) =
R2(RBOT) (k)
16
CSPD (pF)
100
COUT (μF)
10
L (μH)
1.0
1.8 to
2.5
2.5 to
5.0
(VOUT / 0.8-1) × R2
12 1.2
100 470
10 4.7
1.5 2.2
5.0
1.2
470
4.7
4.7
12.0
1.2
470
22
15
5.0
1.2
470
10
10
12

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