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U6229B 반도체 회로 부품 판매점

DC/DC Converter - Power Supply 28 V



TEMIC Semiconductors 로고
TEMIC Semiconductors
U6229B 데이터시트, 핀배열, 회로
www.DataSheet4U.com
DC/DC Converter – Power Supply 28 V
U6229B
Description
The U6229B is a multifunctional power supply IC which
provides four different voltages dedicated to supply
components of complex microcontroller systems.
Supplied by a battery voltage in the wide range from 6 V
to 26 V, the U6229B generates typically 28.4 V with a
step-up converter, PWM, external power MOSFET and
150 m H inductivity. This voltage is fed to a step-down
Features
D Voltage outputs
v– 28.4-V step-up converter with I 1.2 A
v– 7-V step-down converter with I 400 mA
v– 5-V logic supply with I 14 mA
v– 5-V reference voltage with I 14 mA
D Logic input ENABLE
– Enables the step-up converter
Ordering Information
converter with external 150 m H inductivity to generate a
7-V auxiliary voltage with a small ripple. By means of
this voltage, two linear regulators with only a small power
dissipation provide a constant 5-V (±3%) supply for
microcontrollers and an even more accurate 5-V (±2%)
supply as a reference for sensors and a/d converters.
D Analog input VKL15
– Energy-reserve mode switches off the step-up
converter at VBatt < 5.25 V
– Controls start-up behavior
D Logic output NRES
– N-reset output with over/ under voltage
monitoring of both 5-V supplies
Extended Type Number
U6229B
Package
SO20
Remarks
Block Diagram
5V 5V
28.4 V
7V
Logic
Reference
VBatt
Supply
Supply
supply
supply
VBL
VA1
VHL VH
VCC
VREF
GATE
PWM Step-up
SOURCE
converter
SGND
Step-down
converter
Logic
supply
Reference
voltage
VKL15
Start-up circuit
and
over voltage
protection
GND
ENABLE
Oscillator
OSC
Internal
reference
Over / under
voltage
control
VCC / VREF
RSET
AGND
NRES
96 12284
Rev. A1, 21-Apr-99
Figure 1. Block diagram with external circuit
Preliminary Information
1 (8)


U6229B 데이터시트, 핀배열, 회로
U6229B
Pin Description
Pin
1
2
3
4
5, 6, 15, 16, 17
7
8
9
10
11
12
13
14
18
19
20
Symbol
OSC
VBL
VA1
SOURCE
SGND
GATE
VHL
VH
VCC
VREF
NRES
ENVA3
VKL15
AGND
RSET1
GND
Input / Output
Analog input
Analog input
Analog output
Analog input
Ground
Analog output
Analog input
Analog output
Analog output
Analog output
Logic output
Logic input
Analog input
Ground
Analog input
Ground
Function
Oscillator
Input set-up converter
Output set-up converter
Source of switching transistor
Ground
Gate of switch transistor
Output of power switch step-down converter
Regulator input step-down converter
5-V supply voltage
5-V reference voltage
Power-on reset
Control step-up converter
Monitoring supply voltage
Reference ground
Connect external resistor to GND – bias of the current sources
Ground
OSC 1
VBL 2
VA1 3
SOURCE 4
SGND
5
SGND
GATE
6
7
VHL
VH
VCC
8
9
10
20 GND
19 RSET1
18 AGND
17 SGND
16 SGND
15 SGND
14 VKl15
13 ENVA3
12 NRES
11 VREF
Figure 2. Pinning U6229B
Functional Description
Oscillator, Pin 1
The switching frequency fosc is defined with (as) a
triangle oscillator and is programmed with the capacitor
COS1.
fosc = Kosc/COS1
Step-up Converter
VBL Pin 2, VA1 Pin 3
The step–up converter uses the battery voltage (6V to
26 V) to produce a constant output voltage (VA1 typ.
28.4 V). An external power MOSFET serves as the
electronic power switch of the step–up converter. When
this switch is activated, the coil current increases up to a
limit determined by the controller. The power MOSFET
is switched off when this limit is reached, and the energy
stored in the coil is discharged into the capacitance CVA1
via the diode and the switches between VBL and VA1. The
maximum possible coil current is limited to typ. 1.2 A by
the circuit.
2 (8) Rev. A1, 21-Apr-99
Preliminary Information




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U6229B converter

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DC/DC Converter - Power Supply 28 V - TEMIC Semiconductors