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| 型号： | TPS63700DRCTG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.14 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件页数： | 3/25页 |
| 文件大小： | 668K |
| 代理商： | TPS63700DRCTG4 |
www.ti.com
SLVS530B – SEPTEMBER 2005 – REVISED NOVEMBER 2007
DETAILED DESCRIPTION
The TPS63700 is a dc-dc converter for negative output voltages using buck-boost topology. It operates with an
input voltage range of 2.7 V to 5.5 V and generates a negative output voltage down to –15 V. The output is
controlled by a fixed-frequency, pulse-width-modulated (PWM) regulator. In normal operation mode, the
converter operates at continuous conduction mode (CCM). At light loads it can enter discontinuous conduction
mode (DCM).
Power Conversion
The converter operates in a fixed-frequency, pulse-width-modulated control scheme. So, the on-time of the
switches varies depending on input-to-output voltage ratio and the load. During this on-time, the inductor
connected to the converter is charged with current. In the remaining time, the time period set by the fixed
operating frequency, the inductor discharges into the output capacitor via the rectifier diode. Usually, at higher
loads the inductor current is continuous. During light load, the inductor current of this converter can become
discontinuous. In this case, the control circuit of the controller output automatically takes care of these changing
conditions to always operate with an optimum control setup.
Control
The controller circuit of the converter is based on a fixed-frequency, multiple-feed-forward controller topology.
Input voltage, output voltage, and voltage drop across the switch are monitored and forwarded to the regulator.
Changes in the operating conditions of the converter directly affect the duty cycle.
The error amplifier compares the voltage on FB pin with GND to generate an accurate and stable output voltage.
The error amplifier is internally compensated. At light loads, the converter operates in discontinuous conduction
mode (DCM).
If the load will be further decreased, the energy transmitted to the output capacitor can't be absorbed by the load
and would lead to an increase of the output voltage. In this case, the converter limits the output voltage increase
by skipping switch pulses.
Enable
Applying GND signal at the EN pin disables the converter, where all internal circuitry is turned off. The device
now just consumes low shutdown current flowing into the VIN pin. The output load of the converter is also
disconnected from the battery as described in the following paragraph. Pulling the EN pin to VIN enables the
converter. Internal circuitry, necessary to operate the converter, is then turned on.
Load Disconnect
The device supports complete load disconnection when the converter is disabled. The converter turns off the
internal PMOS switch, thus no DC current path remains between load and input voltage source.
Soft Start
The converter has a soft-start function. When the converter is enabled, the implemented switch current limit
ramps up slowly to its nominal value. Soft start is implemented to limit the input current during start-up to avoid
high peak currents at the battery which could interfere with other systems connected to the same battery.
Without soft start, uncontrolled input peak currents flow to charge up the output capacitors and to supply the load
during start-up. This would cause significant voltage drops across the series resistance of the battery and its
connections.
Output Overvoltage Protection
The converter has an implemented output overvoltage protection. The output voltage is limited to –19 V in case
the feedback connection from the output to the FB pin is open.
Copyright 2005–2007, Texas Instruments Incorporated
11
Product Folder Link(s): TPS63700
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