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參數(shù)資料
| 型號(hào)： | TPS65200YFFT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA36 |
| 封裝： | 2.80 X 2.60 MM, 0.40 MM PITCH, GREEN, DSBGA-36 |
| 文件頁數(shù)： | 26/59頁 |
| 文件大?。?/td> | 2424K |
| 代理商： | TPS65200YFFT |
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Precharge
( Linear Charge)
Fast Charge
( PWM Charge)
ISHORT
Termination
V SHORT
Regulation
voltage
Precharge
Phase
Current Regulation
Phase
Voltage Regulation
Phase
Charge Current
Charge Voltage
The charging current during current regulation phase decreases as battery voltage
increases. This mode ensures fastest charging of the battery without exceeding the
adaptor current limit.
SLVSA48 – APRIL 2010
www.ti.com
Figure 53. Typical Charging Profile of TPS65200 With Input Current Limit
PWM Controller in Charge Mode
The TPS65200 provides an integrated, fixed 3-MHz frequency voltage-mode controller with feed-forward function
to regulate charge current or voltage. This type of controller is used to help improve line transient response,
thereby simplifying the compensation network used for both continuous and discontinuous current conduction
operation. The voltage and current loops are internally compensated using a Type-III compensation scheme that
provides enough phase margin for stable operation, allowing the use of small ceramic capacitors with very low
ESR. There is a 0.5-V offset on the bottom of the PWM ramp to allow the device to operate between 0% to
99.5% duty cycles.
The TPS65200 has two back-to-back common-drain N-channel MOSFETs at the high side and one N-channel
MOSFET at the low side. An input N-MOSFET (Q1) prevents battery discharge when VBUS is lower than
VCSOUT. The second high-side N-MOSFET (Q2) behaves as the switching control switch. A charge pump circuit is
used to provide gate drive for Q1, while a boot strap circuit with external boot-strap capacitor is used to boost up
the gate drive voltage for Q2.
Cycle-by-cycle current limit is sensed through the internal sense MOSFETs for Q2 and Q3. The threshold for Q2
is set to a nominal 1.9-A peak current. The low-side MOSFET (Q3) also has a current limit that decides if the
PWM controller will operate in synchronous or non-synchronous mode. This threshold is set to 100mA and it
turns off the low-side N-channel MOSFET (Q3) before the current reverses, preventing the battery from
discharging. Synchronous operation is used when the current of the low-side MOSFET is greater than 100 mA to
minimize power losses.
Battery Charging Process
During precharge phase, while the battery voltage is below the VSHORT threshold, the TPS65200 applies a
short-circuit current, ISHORT, to the battery. When the battery voltage is above VSHORT and below VOREG, the
charge current ramps up to fast charge current, IOCHARGE, or a charge current that corresponds to the input
current of IIN_LIMIT. The slew rate for fast charge current is controlled to minimize the current and voltage
over-shoot during transient. Both the input current limit (default at 100 mA), IIN_LIMIT, and fast charge current,
IOCHARGE, can be set by the host. Once the battery voltage is close to the regulation voltage, VOREG, the charge
current is tapered down as shown in Figure 52. The voltage regulation feedback occurs by monitoring the
battery-pack voltage between the CSOUT and PGND pins. TPS65200 is a fixed single-cell voltage version, with
adjustable regulation voltage (3.5 V to 4.44 V) programmed through I2C interface.
32
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS65200
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