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PDF MB3759 Data sheet ( Hoja de datos )
| Número de pieza | MB3759 | |
| Descripción | Switching Regulator Controller | |
| Fabricantes | Fujitsu | |
| Logotipo |  |
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FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27200-6E
ASSP For Power Management Applications
BIPOLAR
Switching Regulator Controller
(Switchable between push-pull and single-end functions)
MB3759
s DESCRIPTION
The MB3759 is a control IC for constant-frequency pulse width modulated switching regulators.
The IC contains most of the functions required for switching regulator control circuits. This reduces both the
component count and assembly work.
s FEATURES
• Drives a 200 mA load
• Can be set to push-pull or single-end operation
• Prevents double pulses
• Adjustable dead-time
• Error amplifier has wide common phase input range
• Built in a circuit to prevent misoperation due to low power supply voltage.
• Built in an internal 5 V reference voltage with superior voltage reduction characteristics
s PACKAGES
16-pin plastic DIP
16-pin ceramic DIP
16-pin plastic SOP
(DIP-16P-M04)
(DIP-16C-C01)
(FPT-16P-M06)
1 page  
MB3759
(Continued)
Error
amplifier
section
Parameter
Input offset voltage
Input offset current
Input bias current
Common-mode input
voltage
Open-loop voltage
amplification
Unity-gain bandwidth
Common-mode
rejection ratio
Output sink ISINK
current
(pin 3)
ISOURCE
Collector leakage current
Emitter leakage current
Output
section
PWM
comparator
section
Collector
emitter
saturation
voltage
Emitter
grounded
Emitter
follower
Output control input
current
Input threshold voltage
Input sink current (pin 3)
Power supply current
Standby current
Rise time
Switching Fall time
characteristics Rise time
Fall time
Emitter
grounded
Emitter
follower
Symbol
Condition
VIO VO (pin3) = 2.5 V
IIO VO (pin3) = 2.5 V
II VO (pin3) = 2.5 V
VCM 7 V ≤ VCC ≤ 40 V
(VCC = 15 V, Ta = +25 °C)
Value
Min Typ Max
Unit
— ±2 ±10 mV
— ±25 ±250 nA
— −0.2 −1.0 µA
−0.3 — VCC − 2 V
AV 0.5 V ≤ VO ≤ 3.5 V 70
BW AV = 1
—
CMR VCC = 40 V
ISINK
-5 V ≤ VID ≤ -15 mV,
VO = 0.7 V
ISOURCE
15 mV ≤ VID ≤ 5V,
VO = 3.5 V
ICO
VCE = 40 V,
VCC = 40 V
IEO
VCC = VC = 40 V,
VE = 0
65
0.3
−2
—
—
VSAT(C) VE = 0, IC = 200 mA —
VSAT(E)
VC = 15 V,
IE = −200 mA
—
IOPC VI = VREF
—
VTH 0% Duty
ISINK VO (pin3) = 0.7 V
ICC
V(pin4) = 2 V,
See Fig-2
ICCQ
V(pin6) = VREF,
I/O open
tR RL = 68 Ω
tF RL = 68 Ω
tR RL = 68 Ω
tF RL = 68 Ω
—
0.3
—
—
—
—
—
—
95 —
800 —
80 —
dB
kHz
dB
0.7 — mA
−10 —
mA
— 100 µA
— −100 µA
1.1 1.3
V
1.5 2.5
V
1.3 3.5 mA
4 4.5
V
0.7 — mA
8 — mA
7 12
100 200
25 100
100 200
40 100
mA
ns
ns
ns
ns
5
5 Page 
MB3759
s BASIC OPERATION
Switching regulators can achieve a high level of efficiency. This section describes the basic principles of operation
using a chopper regulator as an example.
As shown in the diagram, diode D provides a current path for the current through inductance L when Q is off.
Transistor Q performs switching and is operated at a frequency that provides a stable output. As the switching
element is saturated when Q is on and cutoff when Q is off, the losses in the switching element are much less
than for a series regulator in which the pass transistor is always in the active state.
While Q is conducting, the input voltage VIN is supplied to the LC circuit and when Q is off, the energy stored in
L is supplied to the load via diode D. The LC circuit smooths the input to supply the output voltage.
The output voltage VO is given by the following equation.
VO = Ton VIN = Ton VIN
Ton + Toff
T
Q : ON
L
Q
VIN
D
Q : OFF
C VO
RL
Q: Switching element
D: Flywheel diode
As indicated by the equation, variation in the input voltage is compensated for by controlling the duty cycle (Ton/
T). If VIN drops, the control circuit operates to increase the duty cycle so as to keep the output voltage constant.
The current through L flows from the input to the output when Q is on and through D when Q is off. Accordingly,
the average input current IIN is the product of the output current and the duty cycle for Q.
IIN =
Ton IO
T
The theoretical conversion efficiency if the switching loss in Q and loss in D are ignored is as follows.
η=
PO
PIN
× 100 (%)
=
VO · IO
VIN · IIN
× 100
=
VIN · IO · Ton / T
VIN · IO · Ton / T
= 100 (%)
× 100
The theoretical conversion efficiency is 100%. In practice, losses occur in the switching element and elsewhere,
and design decisions to minimize these losses include making the switching frequency as low as practical and
setting an optimum ratio of input to output voltage.
11
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet MB3759.PDF ] | |
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